{"id":2452,"date":"2025-12-24T13:43:20","date_gmt":"2025-12-24T05:43:20","guid":{"rendered":"https:\/\/www.c-adtech.com\/?p=2452"},"modified":"2026-04-16T10:29:01","modified_gmt":"2026-04-16T02:29:01","slug":"alumina-ceramic-filter","status":"publish","type":"post","link":"https:\/\/www.c-adtech.com\/tr\/alumina-ceramic-filter\/","title":{"rendered":"Erimi\u015f Al\u00fcminyum Filtrasyonu i\u00e7in Al\u00fcmina Seramik K\u00f6p\u00fck Filtre"},"content":{"rendered":"<p>For most aluminum casting and foundry operations seeking a cost-effective way to cut nonmetallic inclusions, improve surface finish, and stabilise metal flow, high-purity <a href=\"https:\/\/www.c-adtech.com\/product\/ceramic-foam-filter\/\">alumina (Al\u2082O\u2083) ceramic foam filters<\/a> deliver the best blend of chemical inertness, thermal durability, and filtration efficiency; choosing the correct pore density (<a href=\"https:\/\/www.c-adtech.com\/20-ppi-filter-foam\/\">PPI<\/a>), plate size, and installation orientation will determine whether the filter reduces scrap, shortens downstream machining, and raises first-pass yield.<\/p>\n<p style=\"text-align: center;\"><span style=\"color: #ff0000;\"><span data-slate-fragment=\"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\">If your project requires the use of aluminum degassing filtration equipment, fluxes, refractory rope, blanket.<\/span> you can <a style=\"color: #ff0000;\" href=\"https:\/\/www.c-adtech.com\/contact-us\/\" target=\"_blank\" rel=\"noopener\">contact us<\/a>\u00a0for a free quote.<\/span><\/p>\n<h2 data-start=\"1536\" data-end=\"1600\">1. What an alumina ceramic filter is and why foundries use it<\/h2>\n<p data-start=\"1602\" data-end=\"2224\">An alumina ceramic filter is an open-cell, rigid ceramic element made primarily from aluminium oxide (Al\u2082O\u2083) that is placed in the metal stream during pouring to trap nonmetallic inclusions, stabilise flow, reduce turbulence, and promote laminar flow upstream of the mould. In aluminum foundry practice these foam or plate filters significantly reduce inclusion count and porosity defects while improving surface finish and mechanical properties of cast parts. Using alumina foam filters typically reduces scrap and rework and raises casting yield when correctly sized and positioned.<\/p>\n<figure id=\"attachment_2453\" aria-describedby=\"caption-attachment-2453\" style=\"width: 527px\" class=\"wp-caption aligncenter\"><img fetchpriority=\"high\" decoding=\"async\" class=\"size-full wp-image-2453\" src=\"http:\/\/www.c-adtech.com\/wp-content\/uploads\/2025\/12\/8494_jwjRKXgd.webp\" alt=\"Refractory Alumina Ceramic Filter\" width=\"527\" height=\"527\" srcset=\"https:\/\/www.c-adtech.com\/wp-content\/uploads\/2025\/12\/8494_jwjRKXgd.webp 527w, https:\/\/www.c-adtech.com\/wp-content\/uploads\/2025\/12\/8494_jwjRKXgd-300x300.webp 300w, https:\/\/www.c-adtech.com\/wp-content\/uploads\/2025\/12\/8494_jwjRKXgd-150x150.webp 150w, https:\/\/www.c-adtech.com\/wp-content\/uploads\/2025\/12\/8494_jwjRKXgd-12x12.webp 12w\" sizes=\"(max-width: 527px) 100vw, 527px\" \/><figcaption id=\"caption-attachment-2453\" class=\"wp-caption-text\">Refractory Alumina Ceramic Filter<\/figcaption><\/figure>\n<h2 data-start=\"2231\" data-end=\"2267\">2. Composition and microstructure<\/h2>\n<ul data-start=\"2269\" data-end=\"2983\">\n<li data-start=\"2269\" data-end=\"2487\">\n<p data-start=\"2271\" data-end=\"2487\">Main ceramic phase: aluminium oxide (Al\u2082O\u2083). Typical commercial foams use high-alumina formulations ranging roughly 70% to 95% Al\u2082O\u2083 depending on the product grade and purpose.<\/p>\n<\/li>\n<li data-start=\"2488\" data-end=\"2752\">\n<p data-start=\"2490\" data-end=\"2752\">Porous network: open-cell reticulated structure produced by coating a sacrificial organic foam with an alumina slurry, drying, and sintering. The result is a three-dimensional skeletal network with interconnected channels.<\/p>\n<\/li>\n<li data-start=\"2753\" data-end=\"2983\">\n<p data-start=\"2755\" data-end=\"2983\">Additives: small fractions of SiO\u2082, ZrO\u2082, or binder residues may appear depending on the recipe and sintering regime; these adjust strength, thermal shock resistance and sintering behaviour.<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"2985\" data-end=\"3309\"><strong data-start=\"2985\" data-end=\"3020\">Why this microstructure matters<\/strong><br data-start=\"3020\" data-end=\"3023\" \/>Open pores create tortuous flow paths which trap large inclusions by direct impaction and capture smaller particles inside a developing filter cake on the skeleton. High porosity gives low pressure drop while maintaining good entrapment efficiency.<\/p>\n<h2 data-start=\"3316\" data-end=\"3367\">3. How these filters are manufactured<\/h2>\n<ol data-start=\"3369\" data-end=\"3996\">\n<li data-start=\"3369\" data-end=\"3467\">\n<p data-start=\"3372\" data-end=\"3467\">Foam template: polyurethane or polymer foam with the required pore density (PPI) is selected.<\/p>\n<\/li>\n<li data-start=\"3468\" data-end=\"3593\">\n<p data-start=\"3471\" data-end=\"3593\">Slurry coating: the foam is dipped into an alumina slurry that contains alumina powder, binders, and rheology modifiers.<\/p>\n<\/li>\n<li data-start=\"3594\" data-end=\"3700\">\n<p data-start=\"3597\" data-end=\"3700\">Drying and burnout: the polymer foam and organic binders are burned out in a controlled thermal ramp.<\/p>\n<\/li>\n<li data-start=\"3701\" data-end=\"3834\">\n<p data-start=\"3704\" data-end=\"3834\">Sintering: the green body is sintered at temperatures typically between 1100 \u00b0C and 1300 \u00b0C, producing a rigid ceramic skeleton.<\/p>\n<\/li>\n<li data-start=\"3835\" data-end=\"3996\">\n<p data-start=\"3838\" data-end=\"3996\">Machining and inspection: final dimensions are trimmed and filters are inspected for defects and dimensional tolerances.<\/p>\n<\/li>\n<\/ol>\n<p>Also read:<a title=\"How to Make a Ceramic Filter\" href=\"https:\/\/www.c-adtech.com\/how-to-make-a-ceramic-filter\/\" target=\"_self\">How to Make a Ceramic Filter<\/a>.<\/p>\n<h2 data-start=\"4003\" data-end=\"4048\">4. Filter geometries and common dimensions<\/h2>\n<p data-start=\"4050\" data-end=\"4102\">Alumina filters are supplied in these typical forms:<\/p>\n<ul data-start=\"4104\" data-end=\"4637\">\n<li data-start=\"4104\" data-end=\"4350\">\n<p data-start=\"4106\" data-end=\"4350\">Plates: flat, square or circular plates (popular for gating inserts and plate filter systems). Common sizes include 7&#8243;, 9&#8243;, 12&#8243;, 15&#8243;, 17&#8243;, 20&#8243;, 23&#8243; square or round plates with thickness commonly 20\u201350 mm.<\/p>\n<\/li>\n<li data-start=\"4351\" data-end=\"4492\">\n<p data-start=\"4353\" data-end=\"4492\">Blocks: small rectangular blocks used for localized filtration in ladles or nodular gating systems.<\/p>\n<\/li>\n<li data-start=\"4493\" data-end=\"4637\">\n<p data-start=\"4495\" data-end=\"4637\">Cylinders and cut shapes: bespoke shapes produced by machining or moulding for specialised pouring rigs.<\/p>\n<\/li>\n<\/ul>\n<figure id=\"attachment_2454\" aria-describedby=\"caption-attachment-2454\" style=\"width: 673px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"size-full wp-image-2454\" src=\"http:\/\/www.c-adtech.com\/wp-content\/uploads\/2025\/12\/7775_kGcd2bz2.webp\" alt=\"Detail Display of Alumina Ceramic Filter\" width=\"673\" height=\"482\" srcset=\"https:\/\/www.c-adtech.com\/wp-content\/uploads\/2025\/12\/7775_kGcd2bz2.webp 673w, https:\/\/www.c-adtech.com\/wp-content\/uploads\/2025\/12\/7775_kGcd2bz2-300x215.webp 300w, https:\/\/www.c-adtech.com\/wp-content\/uploads\/2025\/12\/7775_kGcd2bz2-18x12.webp 18w\" sizes=\"(max-width: 673px) 100vw, 673px\" \/><figcaption id=\"caption-attachment-2454\" class=\"wp-caption-text\">Detail Display of Alumina Ceramic Filter<\/figcaption><\/figure>\n<h2 data-start=\"4644\" data-end=\"4697\">5. Key technical specifications and what they mean<\/h2>\n<div class=\"TyagGW_tableContainer\">\n<div class=\"group TyagGW_tableWrapper flex w-fit flex-col-reverse\" tabindex=\"-1\">\n<table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"4699\" data-end=\"5924\">\n<thead data-start=\"4699\" data-end=\"4755\">\n<tr data-start=\"4699\" data-end=\"4755\">\n<th data-start=\"4699\" data-end=\"4711\" data-col-size=\"sm\">Parameter<\/th>\n<th data-start=\"4711\" data-end=\"4736\" data-col-size=\"md\">Typical range or value<\/th>\n<th data-start=\"4736\" data-end=\"4755\" data-col-size=\"lg\">What it affects<\/th>\n<\/tr>\n<\/thead>\n<tbody data-start=\"4771\" data-end=\"5924\">\n<tr data-start=\"4771\" data-end=\"4928\">\n<td data-start=\"4771\" data-end=\"4801\" data-col-size=\"sm\">Composition (Al\u2082O\u2083 content)<\/td>\n<td data-start=\"4801\" data-end=\"4820\" data-col-size=\"md\">70% to 95% Al\u2082O\u2083<\/td>\n<td data-start=\"4820\" data-end=\"4928\" data-col-size=\"lg\">Chemical stability and corrosion resistance in molten aluminium.<\/td>\n<\/tr>\n<tr data-start=\"4929\" data-end=\"5078\">\n<td data-start=\"4929\" data-end=\"4940\" data-col-size=\"sm\">Porosity<\/td>\n<td data-start=\"4940\" data-end=\"4965\" data-col-size=\"md\">80% to 90% (open cell)<\/td>\n<td data-start=\"4965\" data-end=\"5078\" data-col-size=\"lg\">Permeability and pressure drop; high porosity lowers flow resistance.<\/td>\n<\/tr>\n<tr data-start=\"5079\" data-end=\"5262\">\n<td data-start=\"5079\" data-end=\"5100\" data-col-size=\"sm\">Pore density (PPI)<\/td>\n<td data-start=\"5100\" data-end=\"5126\" data-col-size=\"md\">10 PPI to 60 PPI common<\/td>\n<td data-start=\"5126\" data-end=\"5262\" data-col-size=\"lg\">Higher PPI gives finer filtration but raises pressure drop. Select by casting quality needs.<\/td>\n<\/tr>\n<tr data-start=\"5263\" data-end=\"5421\">\n<td data-start=\"5263\" data-end=\"5287\" data-col-size=\"sm\">Operating temperature<\/td>\n<td data-col-size=\"md\" data-start=\"5287\" data-end=\"5331\">\u22641100 \u00b0C to \u22641300 \u00b0C depending on product<\/td>\n<td data-col-size=\"lg\" data-start=\"5331\" data-end=\"5421\">Safe continuous and transient exposure limits<\/td>\n<\/tr>\n<tr data-start=\"5422\" data-end=\"5546\">\n<td data-start=\"5422\" data-end=\"5437\" data-col-size=\"sm\">Bulk density<\/td>\n<td data-start=\"5437\" data-end=\"5456\" data-col-size=\"md\">0.3 to 0.6 g\/cm\u00b3<\/td>\n<td data-start=\"5456\" data-end=\"5546\" data-col-size=\"lg\">Related to porosity and mechanical robustness.<\/td>\n<\/tr>\n<tr data-start=\"5547\" data-end=\"5731\">\n<td data-start=\"5547\" data-end=\"5582\" data-col-size=\"sm\">Compression strength (room temp)<\/td>\n<td data-start=\"5582\" data-end=\"5607\" data-col-size=\"md\">0.6 to 1.0 MPa typical<\/td>\n<td data-start=\"5607\" data-end=\"5731\" data-col-size=\"lg\">Handling and transport robustness; higher is better but brittle nature persists.<\/td>\n<\/tr>\n<tr data-start=\"5732\" data-end=\"5924\">\n<td data-start=\"5732\" data-end=\"5755\" data-col-size=\"sm\">Thermal shock cycles<\/td>\n<td data-start=\"5755\" data-end=\"5814\" data-col-size=\"md\">Survive 5\u20136 cycles from 800\u20131100 \u00b0C to RT in many grades<\/td>\n<td data-col-size=\"lg\" data-start=\"5814\" data-end=\"5924\">Practical resilience to sudden exposure during pouring operations.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<p data-start=\"5926\" data-end=\"6086\">Key technical claims used in purchasing decisions should always be backed by supplier data sheets and test certificates.<\/p>\n<h2 data-start=\"6093\" data-end=\"6144\">6. Filtration mechanisms in molten metal casting<\/h2>\n<p data-start=\"6146\" data-end=\"6239\">There are three principal mechanisms by which alumina foam filters improve metal cleanliness:<\/p>\n<ol data-start=\"6241\" data-end=\"6827\">\n<li data-start=\"6241\" data-end=\"6388\">\n<p data-start=\"6244\" data-end=\"6388\"><strong data-start=\"6244\" data-end=\"6276\">Direct capture and impaction<\/strong><br data-start=\"6276\" data-end=\"6279\" \/>Large oxide fragments and slag particles collide with the ceramic strut and become trapped on the surface.<\/p>\n<\/li>\n<li data-start=\"6390\" data-end=\"6639\">\n<p data-start=\"6393\" data-end=\"6639\"><strong data-start=\"6393\" data-end=\"6432\">Depth filtration and cake formation<\/strong><br data-start=\"6432\" data-end=\"6435\" \/>As inclusions accumulate, they form a porous cake which then captures smaller particles inside the filter network. This increases filtration efficiency over time but progressively raises pressure drop.<\/p>\n<\/li>\n<li data-start=\"6641\" data-end=\"6827\">\n<p data-start=\"6644\" data-end=\"6827\"><strong data-start=\"6644\" data-end=\"6665\">Flow conditioning<\/strong><br data-start=\"6665\" data-end=\"6668\" \/>The open-cell structure slows and smooths the metal, encouraging laminar flow into the mold and reducing entrainment of air and oxides caused by turbulence.<\/p>\n<\/li>\n<\/ol>\n<p data-start=\"6829\" data-end=\"7051\">These mechanisms operate together; filter selection and correct placement maximise the beneficial combination of capture and flow conditioning while avoiding excessive pressure loss.<\/p>\n<figure id=\"attachment_2455\" aria-describedby=\"caption-attachment-2455\" style=\"width: 489px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"size-full wp-image-2455\" src=\"http:\/\/www.c-adtech.com\/wp-content\/uploads\/2025\/12\/5093_jgnPYPSW.webp\" alt=\"Customized Alumina Ceramic Filters\" width=\"489\" height=\"486\" srcset=\"https:\/\/www.c-adtech.com\/wp-content\/uploads\/2025\/12\/5093_jgnPYPSW.webp 489w, https:\/\/www.c-adtech.com\/wp-content\/uploads\/2025\/12\/5093_jgnPYPSW-300x298.webp 300w, https:\/\/www.c-adtech.com\/wp-content\/uploads\/2025\/12\/5093_jgnPYPSW-150x150.webp 150w, https:\/\/www.c-adtech.com\/wp-content\/uploads\/2025\/12\/5093_jgnPYPSW-12x12.webp 12w\" sizes=\"(max-width: 489px) 100vw, 489px\" \/><figcaption id=\"caption-attachment-2455\" class=\"wp-caption-text\">Customized Alumina Ceramic Filters<\/figcaption><\/figure>\n<h2 data-start=\"7058\" data-end=\"7109\">7. Choosing the right pore density and pore size<\/h2>\n<p data-start=\"7111\" data-end=\"7382\">Pore density is often expressed in PPI (pores per inch). The trade off is simple: more pores per inch equals finer capture ability but higher resistance and possibly slower pour rates. Use the table below as an objective starting point; always validate with plant trials.<\/p>\n<div class=\"TyagGW_tableContainer\">\n<div class=\"group TyagGW_tableWrapper flex w-fit flex-col-reverse\" tabindex=\"-1\">\n<table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"7384\" data-end=\"8242\">\n<thead data-start=\"7384\" data-end=\"7450\">\n<tr data-start=\"7384\" data-end=\"7450\">\n<th data-start=\"7384\" data-end=\"7398\" data-col-size=\"sm\">Typical PPI<\/th>\n<th data-start=\"7398\" data-end=\"7432\" data-col-size=\"md\">Typical use in aluminum casting<\/th>\n<th data-start=\"7432\" data-end=\"7450\" data-col-size=\"lg\">Practical note<\/th>\n<\/tr>\n<\/thead>\n<tbody data-start=\"7466\" data-end=\"8242\">\n<tr data-start=\"7466\" data-end=\"7636\">\n<td data-start=\"7466\" data-end=\"7478\" data-col-size=\"sm\">10\u201315 PPI<\/td>\n<td data-start=\"7478\" data-end=\"7536\" data-col-size=\"md\">Large gating systems; primary filtration for fast pours<\/td>\n<td data-col-size=\"lg\" data-start=\"7536\" data-end=\"7636\">Low resistance; traps big inclusions; low clogging risk.<\/td>\n<\/tr>\n<tr data-start=\"7637\" data-end=\"7832\">\n<td data-start=\"7637\" data-end=\"7649\" data-col-size=\"sm\">20\u201330 PPI<\/td>\n<td data-col-size=\"md\" data-start=\"7649\" data-end=\"7710\">General purpose aluminum alloy casting; most commonly used<\/td>\n<td data-col-size=\"lg\" data-start=\"7710\" data-end=\"7832\">Balanced capture and flow, suitable for many sand and permanent mold castings.<\/td>\n<\/tr>\n<tr data-start=\"7833\" data-end=\"8042\">\n<td data-start=\"7833\" data-end=\"7845\" data-col-size=\"sm\">30\u201340 PPI<\/td>\n<td data-start=\"7845\" data-end=\"7903\" data-col-size=\"md\">High-quality castings, aerospace or critical components<\/td>\n<td data-start=\"7903\" data-end=\"8042\" data-col-size=\"lg\">Finer filtration for smaller inclusions but watch pour rate and potential for faster head loss.<\/td>\n<\/tr>\n<tr data-start=\"8043\" data-end=\"8242\">\n<td data-start=\"8043\" data-end=\"8055\" data-col-size=\"sm\">40\u201360 PPI<\/td>\n<td data-start=\"8055\" data-end=\"8125\" data-col-size=\"md\">Precision and thin-walled castings where surface finish is critical<\/td>\n<td data-col-size=\"lg\" data-start=\"8125\" data-end=\"8242\">Only for low flow rate or staged filtration systems due to pressure rise.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<p data-start=\"8244\" data-end=\"8399\">When in doubt, run a paraffin or water flow test with a production geometry replica to estimate pressure drop and fill time before finalising a PPI choice.<\/p>\n<h2 data-start=\"8406\" data-end=\"8477\">8. Typical operating temperatures, strength and thermal shock limits<\/h2>\n<ul data-start=\"8479\" data-end=\"9287\">\n<li data-start=\"8479\" data-end=\"8749\">\n<p data-start=\"8481\" data-end=\"8749\">Continuous exposure ranges: many alumina foams are rated up to around 1100 \u00b0C to 1300 \u00b0C depending on grade. Suppliers report working temperature \u22641100 \u00b0C for common foundry grades and up to 1200 \u00b0C for higher alumina content.<\/p>\n<\/li>\n<li data-start=\"8750\" data-end=\"9078\">\n<p data-start=\"8752\" data-end=\"9078\">Thermal shock: many commercial products survive multiple thermal shock cycles (for example 800 \u00b0C to room temperature five times) but performance depends on sintering schedule and microstructure. Avoid subjecting filters to sudden mechanical shock or bending; brittleness is inherent.<\/p>\n<\/li>\n<li data-start=\"9079\" data-end=\"9287\">\n<p data-start=\"9081\" data-end=\"9287\">Mechanical properties: compression strength at room temperature is typically below metals and measured in MPa. Handle with care during storage, insertion and pouring.<\/p>\n<\/li>\n<\/ul>\n<h2 data-start=\"9294\" data-end=\"9341\">9. Installation, handling and best practices<\/h2>\n<p data-start=\"9343\" data-end=\"9388\">Practical tips to get consistent performance:<\/p>\n<ul data-start=\"9390\" data-end=\"10598\">\n<li data-start=\"9390\" data-end=\"9615\">\n<p data-start=\"9392\" data-end=\"9615\"><strong data-start=\"9392\" data-end=\"9407\">Orientation<\/strong>: Install the filter so molten metal flows through the thicker face first for even use of depth. For plates, align the flow direction to manufacturer recommendations.<\/p>\n<\/li>\n<li data-start=\"9616\" data-end=\"9872\">\n<p data-start=\"9618\" data-end=\"9872\"><strong data-start=\"9618\" data-end=\"9641\">Seating and support<\/strong>: Use a rigid seating ring or ceramic support in the gating system to prevent filter breakage and to avoid bypass. A small bead of refractory cement at the edge helps prevent metal leakage.<\/p>\n<\/li>\n<li data-start=\"9873\" data-end=\"10071\">\n<p data-start=\"9875\" data-end=\"10071\"><strong data-start=\"9875\" data-end=\"9890\">Cleanliness<\/strong>: Keep filters in clean, dry packaging until use. Contamination with humidity or grease can cause spalling or gas formation during pouring.<\/p>\n<\/li>\n<li data-start=\"10072\" data-end=\"10363\">\n<p data-start=\"10074\" data-end=\"10363\"><strong data-start=\"10074\" data-end=\"10088\">Preheating<\/strong>: Preheating is not typically required for short exposure times with molten aluminum but for certain slow pours or when using larger plates, a short thermal equalisation can reduce the risk of thermal shock. Follow supplier guidance.<\/p>\n<\/li>\n<li data-start=\"10364\" data-end=\"10598\">\n<p data-start=\"10366\" data-end=\"10598\"><strong data-start=\"10366\" data-end=\"10386\">Discard criteria<\/strong>: If the filter cracks, has visible contamination, or was dropped, discard it. Also replace if flow rate is excessively low during a test pour indicating internal blockage.<\/p>\n<\/li>\n<\/ul>\n<figure id=\"attachment_2301\" aria-describedby=\"caption-attachment-2301\" style=\"width: 648px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-2301\" src=\"http:\/\/www.c-adtech.com\/wp-content\/uploads\/2025\/12\/4136_HaacBjjh.webp\" alt=\"Workers are placing ceramic foam filter plates in the filter box\" width=\"648\" height=\"477\" srcset=\"https:\/\/www.c-adtech.com\/wp-content\/uploads\/2025\/12\/4136_HaacBjjh.webp 648w, https:\/\/www.c-adtech.com\/wp-content\/uploads\/2025\/12\/4136_HaacBjjh-300x221.webp 300w, https:\/\/www.c-adtech.com\/wp-content\/uploads\/2025\/12\/4136_HaacBjjh-16x12.webp 16w\" sizes=\"(max-width: 648px) 100vw, 648px\" \/><figcaption id=\"caption-attachment-2301\" class=\"wp-caption-text\">Workers are placing ceramic foam filter plates in the filter box<\/figcaption><\/figure>\n<h2 data-start=\"10605\" data-end=\"10665\">10. Comparing alumina with other ceramic filter materials<\/h2>\n<div class=\"TyagGW_tableContainer\">\n<div class=\"group TyagGW_tableWrapper flex w-fit flex-col-reverse\" tabindex=\"-1\">\n<table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"10667\" data-end=\"11655\">\n<thead data-start=\"10667\" data-end=\"10749\">\n<tr data-start=\"10667\" data-end=\"10749\">\n<th data-start=\"10667\" data-end=\"10678\" data-col-size=\"sm\">Property<\/th>\n<th data-start=\"10678\" data-end=\"10696\" data-col-size=\"md\">Alumina (Al\u2082O\u2083)<\/th>\n<th data-start=\"10696\" data-end=\"10720\" data-col-size=\"md\">Silicon Carbide (SiC)<\/th>\n<th data-start=\"10720\" data-end=\"10738\" data-col-size=\"md\">Zirconia (ZrO\u2082)<\/th>\n<th data-start=\"10738\" data-end=\"10749\" data-col-size=\"md\">Mullite<\/th>\n<\/tr>\n<\/thead>\n<tbody data-start=\"10773\" data-end=\"11655\">\n<tr data-start=\"10773\" data-end=\"11066\">\n<td data-start=\"10773\" data-end=\"10808\" data-col-size=\"sm\">Chemical resistance to Al alloys<\/td>\n<td data-start=\"10808\" data-end=\"10908\" data-col-size=\"md\">Excellent. Non-reactive with Al at typical casting temps.<\/td>\n<td data-col-size=\"md\" data-start=\"10908\" data-end=\"10956\">Good but can oxidise under certain conditions<\/td>\n<td data-col-size=\"md\" data-start=\"10956\" data-end=\"10999\">Very good thermal and chemical stability<\/td>\n<td data-col-size=\"md\" data-start=\"10999\" data-end=\"11066\">Good, lower Al\u2082O\u2083 content so slightly less corrosion resistance<\/td>\n<\/tr>\n<tr data-start=\"11067\" data-end=\"11265\">\n<td data-start=\"11067\" data-end=\"11088\" data-col-size=\"sm\">Max operating temp<\/td>\n<td data-start=\"11088\" data-end=\"11145\" data-col-size=\"md\">~1100\u20131300 \u00b0C.<\/td>\n<td data-start=\"11145\" data-end=\"11180\" data-col-size=\"md\">Higher; used for ferrous casting<\/td>\n<td data-start=\"11180\" data-end=\"11222\" data-col-size=\"md\">Higher; used for specialty applications<\/td>\n<td data-col-size=\"md\" data-start=\"11222\" data-end=\"11265\">Similar to alumina in many foundry uses<\/td>\n<\/tr>\n<tr data-start=\"11266\" data-end=\"11381\">\n<td data-start=\"11266\" data-end=\"11281\" data-col-size=\"sm\">Typical cost<\/td>\n<td data-start=\"11281\" data-end=\"11292\" data-col-size=\"md\">Moderate<\/td>\n<td data-col-size=\"md\" data-start=\"11292\" data-end=\"11336\">Often lower per unit area for some grades<\/td>\n<td data-col-size=\"md\" data-start=\"11336\" data-end=\"11369\">Higher, used only where needed<\/td>\n<td data-col-size=\"md\" data-start=\"11369\" data-end=\"11381\">Moderate<\/td>\n<\/tr>\n<tr data-start=\"11382\" data-end=\"11442\">\n<td data-start=\"11382\" data-end=\"11404\" data-col-size=\"sm\">Abrasion resistance<\/td>\n<td data-start=\"11404\" data-end=\"11411\" data-col-size=\"md\">High<\/td>\n<td data-start=\"11411\" data-end=\"11423\" data-col-size=\"md\">Very high<\/td>\n<td data-start=\"11423\" data-end=\"11430\" data-col-size=\"md\">High<\/td>\n<td data-start=\"11430\" data-end=\"11442\" data-col-size=\"md\">Moderate<\/td>\n<\/tr>\n<tr data-start=\"11443\" data-end=\"11655\">\n<td data-start=\"11443\" data-end=\"11462\" data-col-size=\"sm\">Typical use case<\/td>\n<td data-start=\"11462\" data-end=\"11514\" data-col-size=\"md\">Non-ferrous foundry filtration including aluminum<\/td>\n<td data-col-size=\"md\" data-start=\"11514\" data-end=\"11549\">Ferrous foundry, some nonferrous<\/td>\n<td data-col-size=\"md\" data-start=\"11549\" data-end=\"11602\">Specialized high-temp, chemically aggressive melts<\/td>\n<td data-col-size=\"md\" data-start=\"11602\" data-end=\"11655\">General foundry filtration where cost is a factor<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<p data-start=\"11657\" data-end=\"11874\">Alumina balances price with inertness toward aluminium and is therefore widely used for aluminium casting. For iron or steel, SiC grades or other compositions may be preferable.<\/p>\n<h2 data-start=\"11881\" data-end=\"11936\">11. Quality control, testing and acceptance criteria<\/h2>\n<p data-start=\"11938\" data-end=\"11999\">Important factory tests and documentation you should request:<\/p>\n<ul data-start=\"12001\" data-end=\"12660\">\n<li data-start=\"12001\" data-end=\"12127\">\n<p data-start=\"12003\" data-end=\"12127\"><strong data-start=\"12003\" data-end=\"12039\">Chemical composition certificate<\/strong> showing Al\u2082O\u2083 content and significant oxides.<\/p>\n<\/li>\n<li data-start=\"12128\" data-end=\"12257\">\n<p data-start=\"12130\" data-end=\"12257\"><strong data-start=\"12130\" data-end=\"12163\">Porosity and PPI verification<\/strong>: supplier data on PPI and open porosity percentage.<\/p>\n<\/li>\n<li data-start=\"12258\" data-end=\"12358\">\n<p data-start=\"12260\" data-end=\"12358\"><strong data-start=\"12260\" data-end=\"12286\">Dimensional tolerances<\/strong> for plate size and thickness.<\/p>\n<\/li>\n<li data-start=\"12359\" data-end=\"12503\">\n<p data-start=\"12361\" data-end=\"12503\"><strong data-start=\"12361\" data-end=\"12397\">Thermal shock and strength tests<\/strong>: number of cycles to failure or passed cycles at given delta T.<\/p>\n<\/li>\n<li data-start=\"12504\" data-end=\"12660\">\n<p data-start=\"12506\" data-end=\"12660\"><strong data-start=\"12506\" data-end=\"12543\">Flow rate and filtration capacity<\/strong>: bench tests indicating total tonnage filtered at representative pour rates.<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"12662\" data-end=\"12897\">On receiving filters, run a simple water or paraffin mock pouring test to validate installation geometry and approximate pressure drop before moving to molten aluminium. This is fast, inexpensive and reveals gross fit or flow problems.<\/p>\n<h2 data-start=\"12904\" data-end=\"12960\">12. Environmental, safety and disposal considerations<\/h2>\n<ul data-start=\"12962\" data-end=\"13479\">\n<li data-start=\"12962\" data-end=\"13209\">\n<p data-start=\"12964\" data-end=\"13209\">Ceramic foam filters are inert and non-hazardous when intact; however, handling powdered or broken ceramic dust can be an inhalation hazard so use personal protective equipment when cutting or machining.<\/p>\n<\/li>\n<li data-start=\"13210\" data-end=\"13479\">\n<p data-start=\"13212\" data-end=\"13479\">Spent filters containing adhered metal residues should be treated as foundry waste; many plants recover metal by remelting or clean disposal in accordance with local regulations. Check local waste rules for foundry by-products.<\/p>\n<\/li>\n<\/ul>\n<h2 data-start=\"13486\" data-end=\"13545\">13. Practical application examples and expected benefits<\/h2>\n<ul data-start=\"13547\" data-end=\"14178\">\n<li data-start=\"13547\" data-end=\"13762\">\n<p data-start=\"13549\" data-end=\"13762\"><strong data-start=\"13549\" data-end=\"13588\">Sand casting of automotive housings<\/strong>: switching from no filter to a 20\u201330 PPI alumina plate often reduces inclusion-related rejections and lowers final machining scrap.<\/p>\n<\/li>\n<li data-start=\"13763\" data-end=\"13978\">\n<p data-start=\"13765\" data-end=\"13978\"><strong data-start=\"13765\" data-end=\"13797\">Precision aerospace castings<\/strong>: using 30\u201360 PPI plates improves surface smoothness and lowers secondary grinding work but requires adjusted gating to maintain fill time.<\/p>\n<\/li>\n<li data-start=\"13979\" data-end=\"14178\">\n<p data-start=\"13981\" data-end=\"14178\"><strong data-start=\"13981\" data-end=\"14017\">High throughput die casting feed<\/strong>: larger, low PPI blocks placed upstream of a sprue cut down coarse inclusions and stabilise flow during high mass pours.<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"14180\" data-end=\"14475\">Quantifiable outcomes reported by suppliers and foundries commonly include fewer porosity defects, improved tensile and elongation metrics for certain alloys, and reduced scrap rates. Realised savings depend on alloy, casting geometry and process control.<\/p>\n<style>\n.casting-faq-container {<br \/>    max-width: 950px;<br \/>    margin: 30px auto;<br \/>    font-family: \"Segoe UI\", Roboto, sans-serif;<br \/>    color: #2c3e50;<br \/>}<br \/>.casting-faq-header {<br \/>    background: linear-gradient(135deg, #0277bd 0%, #01579b 100%);<br \/>    color: #ffffff;<br \/>    padding: 25px;<br \/>    border-radius: 8px 8px 0 0;<br \/>    border-bottom: 5px solid #ffca28;<br \/>}<br \/>.casting-faq-item {<br \/>    border: 1px solid #e1f5fe;<br \/>    margin-bottom: 12px;<br \/>    background: #ffffff;<br \/>    border-radius: 6px;<br \/>    transition: all 0.3s ease;<br \/>}<br \/>.casting-faq-item:hover {<br \/>    box-shadow: 0 4px 12px rgba(0,0,0,0.1);<br \/>}<br \/>.casting-faq-question {<br \/>    padding: 18px 25px;<br \/>    font-weight: 700;<br \/>    font-size: 1.1em;<br \/>    cursor: pointer;<br \/>    display: flex;<br \/>    justify-content: space-between;<br \/>    align-items: center;<br \/>    list-style: none;<br \/>    background: #f1f8e9; \/* Light green for decision-making theme *\/<br \/>}<br \/>.casting-faq-question::-webkit-details-marker {<br \/>    display: none;<br \/>}<br \/>.casting-faq-question::after {<br \/>    content: '\\2714';<br \/>    font-size: 1.2rem;<br \/>    color: #2e7d32;<br \/>}<br \/>.casting-faq-answer {<br \/>    padding: 22px 30px;<br \/>    line-height: 1.8;<br \/>    color: #37474f;<br \/>}<br \/>.roi-box {<br \/>    background-color: #e3f2fd;<br \/>    border: 1px solid #90caf9;<br \/>    padding: 15px;<br \/>    margin-top: 15px;<br \/>    border-radius: 4px;<br \/>    font-size: 0.95em;<br \/>}<br \/><\/style>\n<div class=\"casting-faq-container\">\n<div class=\"casting-faq-header\">\n<h2>Aluminum Casting Filtration: Selection &amp; Operations FAQ<\/h2>\n<\/div>\n<details class=\"casting-faq-item\">\n<summary class=\"casting-faq-question\">1. How do I decide between 20 PPI and 30 PPI for general Al casting?<\/summary>\n<div class=\"casting-faq-answer\">Start with 20-30 PPI for most general-purpose applications. Choose <strong>20 PPI<\/strong> if your pour rate is high or the gating cross-section is restricted. Select <strong>30 PPI<\/strong> when surface quality must be improved and you have precise control over pour speed. Pilot trials are essential to find the perfect balance.<\/div>\n<\/details>\n<details class=\"casting-faq-item\">\n<summary class=\"casting-faq-question\">2. Can ceramic filters be cleaned and reused?<\/summary>\n<div class=\"casting-faq-answer\"><strong>No.<\/strong> Filters are strictly single-use consumables. Once they have trapped inclusions and been exposed to molten metal, their structural integrity is compromised and the internal pores are blocked. Attempting to reuse them will result in casting contamination and possible filter breakage.<\/div>\n<\/details>\n<details class=\"casting-faq-item\">\n<summary class=\"casting-faq-question\">3. Do I need an adhesive or mortar to seal the filter?<\/summary>\n<div class=\"casting-faq-answer\">To prevent &#8220;bypass leaks&#8221; (metal flowing around the edge), a small bead of <strong>refractory cement<\/strong> or a factory-supplied ceramic fiber seating ring is highly recommended. Avoid organic adhesives, as they burn off, creating gas that can cause porosity defects in the casting.<\/div>\n<\/details>\n<details class=\"casting-faq-item\">\n<summary class=\"casting-faq-question\">4. What are the signs that a filter is clogged?<\/summary>\n<div class=\"casting-faq-answer\">\n<p>Key indicators of clogging include:<\/p>\n<ul>\n<li>A sudden slowdown in mold fill time.<\/li>\n<li>Increased &#8220;head loss&#8221; (the metal level rising significantly above the filter).<\/li>\n<li>A surge in ladle temperature due to prolonged pouring times.<\/li>\n<\/ul>\n<\/div>\n<\/details>\n<details class=\"casting-faq-item\">\n<summary class=\"casting-faq-question\">5. Are alumina filters safe with alloys containing silicon or magnesium?<\/summary>\n<div class=\"casting-faq-answer\"><strong>Yes.<\/strong> Alumina (Al2O3) filters are chemically stable and compatible with common Al-Si (Aluminum-Silicon) and Al-Mg (Aluminum-Magnesium) alloys. They will not react with the melt under normal casting conditions.<\/div>\n<\/details>\n<details class=\"casting-faq-item\">\n<summary class=\"casting-faq-question\">6. Can honeycomb or extruded filters replace foam filters?<\/summary>\n<div class=\"casting-faq-answer\">Honeycomb filters have straight, parallel channels which are excellent for <strong>reducing turbulence<\/strong> but provide less &#8220;depth filtration&#8221; than foam. Foam filters, with their tortuous 3D paths, are far more effective at trapping smaller, non-metallic inclusions.<\/div>\n<\/details>\n<details class=\"casting-faq-item\">\n<summary class=\"casting-faq-question\">7. What size filter do I need for a 300 kg pour?<\/summary>\n<div class=\"casting-faq-answer\">Sizing depends on your desired flow rate and the alloy&#8217;s cleanliness. For a 300 kg pour, common choices are <strong>10 to 15-inch plates<\/strong> at 20-30 PPI. Always verify this against your supplier&#8217;s specific flow-capacity charts, as filter thickness also impacts throughput.<\/div>\n<\/details>\n<details class=\"casting-faq-item\">\n<summary class=\"casting-faq-question\">8. Should I preheat the filter before use?<\/summary>\n<div class=\"casting-faq-answer\">While optional for most small aluminum work, preheating is highly beneficial for <strong>large plates (above 15 inches)<\/strong> or in cold environments. It reduces thermal shock and ensures the molten metal doesn&#8217;t &#8220;freeze&#8221; in the pores during the start of the pour.<\/div>\n<\/details>\n<details class=\"casting-faq-item\">\n<summary class=\"casting-faq-question\">9. How should I store ceramic filters?<\/summary>\n<div class=\"casting-faq-answer\">Store filters in a <strong>dry, indoor environment<\/strong>, stacked flat on stable shelves or pallets in their original packaging. Ceramic filters are brittle; avoid any impacts, dropping, or heavy vibration during handling.<\/div>\n<\/details>\n<details class=\"casting-faq-item\">\n<summary class=\"casting-faq-question\">10. How much will filters add to my part cost?<\/summary>\n<div class=\"casting-faq-answer\">\n<p>The unit cost is modest relative to the value of the casting. Most foundries find that the cost of the filter is <strong>fully recovered<\/strong> through:<\/p>\n<ul>\n<li>Significant reduction in scrap rates.<\/li>\n<li>Less time spent on surface grinding and repairs.<\/li>\n<li>Longer tool life during downstream machining.<\/li>\n<\/ul>\n<div class=\"roi-box\"><strong>Pro Tip:<\/strong> Run a simple ROI estimate: (Total Scrap Cost Saved + Machining Time Saved) \/ (Filter Cost). Most high-quality runs show a 3:1 to 5:1 return.<\/div>\n<\/div>\n<\/details>\n<\/div>\n<p><script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"20 PPI vs 30 PPI aluminum filter choice?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Choose 20 PPI for high flow and 30 PPI for better surface quality and cleanliness when flow can be controlled.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How to prevent filter bypass leaks?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Use a ceramic fiber gasket or refractory cement to create a tight seal between the filter and the gating system seat.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are alumina filters compatible with magnesium alloys?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes, Alumina (Al2O3) is chemically stable and widely used with both Al-Si and Al-Mg casting alloys.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How to store ceramic foam filters?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Keep filters dry, in original packaging, and stored flat to prevent breakage due to their brittle nature.\"\n      }\n    }\n  ]\n}\n<\/script><\/p>\n<h2 data-start=\"17393\" data-end=\"17436\">Purchase and specification checklist<\/h2>\n<ul data-start=\"17438\" data-end=\"17925\">\n<li data-start=\"17438\" data-end=\"17532\">\n<p data-start=\"17440\" data-end=\"17532\">Confirm Al\u2082O\u2083 content and certificate of analysis.<\/p>\n<\/li>\n<li data-start=\"17533\" data-end=\"17642\">\n<p data-start=\"17535\" data-end=\"17642\">Select PPI and thickness that match pour rate and quality target.<\/p>\n<\/li>\n<li data-start=\"17643\" data-end=\"17758\">\n<p data-start=\"17645\" data-end=\"17758\">Request flow rate\/filtration capacity table for the chosen plate sizes.<\/p>\n<\/li>\n<li data-start=\"17759\" data-end=\"17853\">\n<p data-start=\"17761\" data-end=\"17853\">Ask for thermal shock and mechanical testing data.<\/p>\n<\/li>\n<li data-start=\"17854\" data-end=\"17925\">\n<p data-start=\"17856\" data-end=\"17925\">Validate through a lab or plant mock pour before production roll out.<\/p>\n<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>For most aluminum casting and foundry operations seeking a cost-effective way to cut nonmetallic inclusions, improve surface finish, and stabilise metal flow, high-purity alumina (Al\u2082O\u2083) ceramic foam filters deliver the best blend of chemical inertness, thermal durability, and filtration efficiency; choosing the correct pore density (PPI), plate size, and installation orientation will determine whether the [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2453,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"class_list":["post-2452","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Alumina Ceramic Foam Filter for Molten Aluminum Filtration - AdTech<\/title>\n<meta name=\"description\" content=\"For most aluminum casting and foundry operations seeking a cost-effective way to cut nonmetallic inclusions, improve surface finish, and stabilise metal flow, high-purity alumina (Al\u2082O\u2083) ceramic foam filters deliver the best blend of chemical inertness, thermal durability, and filtration efficiency\" \/>\n<meta name=\"robots\" content=\"index, follow, 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