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How to Choose the Right Feldspar Mesh Size — 200 Mesh vs 325 Mesh vs 500 Mesh
The 5 factors that should decide your mesh choice:
- Firing cycle length — shorter, fast-fire cycles benefit from finer mesh (325/500) since there's less time for coarser particles to fully melt.
- Surface quality requirement — polished tile, premium glaze, and clear glass benefit from finer mesh's smoother, more uniform melt.
- Body type — standard wall tile bodies rarely need finer than 200 mesh, while porcelain and bone china typically specify 325 mesh or finer.
- Cost sensitivity — finer grinding costs more per tonne; specifying 500 mesh where 200 mesh would perform adequately adds cost without benefit.
- Consistency of supply — whichever mesh you choose, verified sieve analysis on every shipment matters more than the mesh number alone.
Source: Aalok Overseas Technical Laboratory, Rajasthan, India · Manufacturer & Exporter of Feldspar in 200/325/500 Mesh Grades to 50+ Countries Since 1992 · www.feldsparindia.com
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AALOK OVERSEAS INDIA · RAJASTHAN · FELDSPAR DIVISION · TECHNICAL BLOG #19
Particle Size & Melt Behaviour · Sieve Analysis · 200 / 325 / 500 Mesh Grades · Application Matching · NABL COA · Exporter Since 1992
Published: July 2026 | Author: Aalok Overseas Technical Team | Category: Ceramic Raw Material Quality
REQUEST MESH SAMPLE PACK → VIEW FELDSPAR SPECIFICATIONSWhat Does "Mesh Size" Actually Mean?
Mesh size refers to the number of openings per linear inch in the sieve screen a ground powder is passed through during grading — so "200 mesh" means the sieve has 200 openings per inch, and material described as 200 mesh has been sieved to pass through that screen. Critically, a higher mesh number means a finer material, since more, smaller openings per inch means each opening is smaller. This is the opposite of how most people intuitively read "bigger number = bigger size," so it's worth stating plainly: 500 mesh is finer than 325 mesh, which is finer than 200 mesh.
Mesh-to-Micron Conversion Reference
| MESH SIZE | APPROXIMATE MAX PARTICLE SIZE | RELATIVE FINENESS |
|---|---|---|
| 200 Mesh | ~74-75 microns | Coarser — general purpose |
| 325 Mesh | ~44 microns | Medium-fine — porcelain/export grade |
| 400 Mesh | ~37 microns | Fine — intermediate grade |
| 500 Mesh | ~25 microns | Finest — premium/specialty grade |
Values are approximate industry-standard conversions; exact micron cut-off can vary slightly by sieve standard (ASTM vs. Tyler vs. ISO) and by the specific test method used.
8 Ways Mesh Size Affects Ceramic Production
FACTOR 01 — MOST DIRECT IMPACT
Melt Rate and Completeness Within a Firing Cycle
Finer particles have more surface area relative to their volume, so they melt faster and more completely within a fixed firing schedule. Coarse (200 mesh) feldspar can leave partially unmelted grains in a fast-fire cycle designed around finer material, showing up as small unmelted specks or uneven glaze texture.
FACTOR 02 — SURFACE QUALITY
Glaze Smoothness and Gloss
Finer mesh grades produce a more uniform, smoother glaze surface with fewer visible texture irregularities — important for polished vitrified tile, premium sanitaryware, and clear glass work where surface inspection is strict.
FACTOR 03 — PACKING DENSITY
Green (Unfired) Body Density and Strength
Finer particles pack more densely in the unfired body, which can improve green strength and reduce porosity — relevant for bodies that need to withstand handling before firing, though this must be balanced against the plasticity contribution of the clay/kaolin component.
FACTOR 04 — COST EFFICIENCY
Finer Grinding Costs More Per Tonne
Producing 500 mesh material requires more grinding energy and time than 200 mesh, and typically involves a lower yield per tonne of raw ore milled. Specifying a finer mesh than an application actually requires adds cost without a corresponding quality benefit.
FACTOR 05 — APPLICATION MATCHING
Body Type Determines the Appropriate Mesh
Standard wall tile and general-purpose bodies are typically formulated around 200 mesh feldspar and rarely benefit from finer material. Porcelain, bone china, and export-grade vitrified tile bodies are typically formulated around 325 mesh. Fine frit, premium clear glaze, and cosmetic/paint-grade fillers often specify 500 mesh or finer.
FACTOR 06 — HANDLING & DUST CONTROL
Finer Mesh Requires More Careful Handling
Finer material generates more airborne dust during handling and is more prone to moisture pickup and caking in storage, requiring better packaging and handling discipline than coarser grades to maintain consistent quality on arrival.
FACTOR 07 — BLENDING CONSIDERATIONS
Mesh Consistency Matters as Much as the Target Number
Two lots both labelled "325 mesh" can still behave differently if their actual particle size distribution differs — one might have a tighter distribution around 325 mesh while another has a wider spread including both coarser and finer particles. Verified sieve analysis, not just the labelled mesh number, is what predicts actual melt behaviour.
FACTOR 08 — VERIFICATION
Sieve Analysis Should Be a Standard COA Line Item
A retained-on-sieve percentage (how much material is coarser than the stated mesh) is a quick, verifiable way to confirm a shipment matches its labelled mesh grade, and should be reported alongside chemistry and LOI on every Certificate of Analysis.
Mesh-Related Production Problem — Symptom → Cause → Fix
| SYMPTOM OBSERVED | PROBABLE CAUSE | RECOMMENDED FIX |
|---|---|---|
| Unmelted grains visible in fast-fire glaze | Mesh too coarse for the firing cycle length | Switch from 200 mesh to 325 or 500 mesh for fast-fire applications |
| Rough or dull glaze surface despite correct chemistry | Mesh too coarse for the surface quality required | Specify 325 or 500 mesh for polished tile, premium glaze, or clear glass |
| Higher-than-necessary raw material cost | Finer mesh specified than the application actually requires | Reassess whether 200 mesh would perform adequately for standard wall tile bodies |
| Inconsistent melt behaviour despite same labelled mesh | Wide particle size distribution within the "same" mesh grade | Request verified sieve analysis (retained-on-sieve %), not just the labelled mesh number |
| Caking, clumping, or dust issues in storage | Finer mesh material handled/packaged like coarser grades | Confirm supplier uses appropriate moisture-proof packaging for fine mesh grades |
| Low green strength, cracking before firing | Mesh/packing density mismatch with body's clay content | Reassess mesh choice alongside overall body formulation, not in isolation |
Benefits & Advantages of Choosing Aalok Overseas for Mesh-Graded Feldspar
Full Mesh Range from a Single Source
200, 325, and 500 mesh grades all available across potassium feldspar, sodium feldspar, and quartz powder — letting buyers match mesh to application without switching suppliers for different parts of a body formulation.
Mine-Direct Milling Control
Grinding and mesh grading take place in-house at Aalok Overseas' own Rajasthan facilities, rather than through third-party job-work millers — giving tighter control over particle size distribution within each labelled mesh grade.
Verified Sieve Analysis on Every Shipment
Every shipment's NABL-accredited Certificate of Analysis includes sieve analysis (retained-on-sieve percentage) alongside chemistry and LOI, so buyers can verify actual particle size distribution, not just rely on the mesh label.
Consistent Mesh Grading Lot to Lot
Batch-to-batch consistency in mesh grading means kiln schedules tuned around a specific melt behaviour continue to perform predictably shipment after shipment, without the drift that can come from inconsistent third-party milling.
Application-Matched Grade Recommendations
Aalok Overseas' technical team can help match mesh grade to specific body type and firing cycle — from standard 200 mesh for domestic wall tile to 500 mesh for premium frit and clear glaze — avoiding unnecessary cost from over-specifying fineness.
Three Decades of Milling & Export Experience
Aalok Overseas has manufactured and exported mesh-graded feldspar, quartz, and kaolin since 1992, with the processing experience to hold tight particle size distributions across large, continuous production runs for export markets worldwide.
200 vs 325 vs 500 Mesh — Side-by-Side Comparison
| ATTRIBUTE | 200 MESH | 325 MESH | 500 MESH |
|---|---|---|---|
| Approx. Particle Size | ~74-75 microns | ~44 microns | ~25 microns |
| Typical Application | Standard wall tile, domestic bodies | Porcelain, export vitrified tile, frit | Premium frit, clear glaze, cosmetic/paint fillers |
| Melt Completeness (Fast-Fire) | Adequate for standard cycles | Good — suited to faster cycles | Excellent — suited to shortest cycles |
| Surface Smoothness | Standard | Improved | Finest available |
| Relative Cost per Tonne | Lowest | Moderate | Highest |
| Handling Sensitivity | Low | Moderate | Higher — requires careful packaging |
All grades: NABL XRF COA including sieve analysis and LOI · MSDS · Certificate of Origin · Free sample — 48hr dispatch · FOB Mundra / Kandla · Export to 50+ countries
FAQ — Feldspar Mesh Size
Q
Is 325 mesh finer or coarser than 200 mesh?
325 mesh is finer than 200 mesh. A higher mesh number means more sieve openings per linear inch, which means each opening — and therefore the maximum particle size that passes through — is smaller.
Q
Which mesh size is best for standard ceramic wall tiles?
200 mesh is standard for domestic and general-purpose wall tile bodies. It provides adequate melt completeness for typical firing cycles at a lower cost than finer grades, without the added expense of fineness the application doesn't require.
Q
When should I use 500 mesh feldspar instead of 325 mesh?
500 mesh is appropriate for premium frit manufacturing, fine clear glaze work, and cosmetic or paint-grade filler applications where maximum surface smoothness, fastest melt completeness, or finest particle distribution is required. For most standard porcelain and export vitrified tile bodies, 325 mesh is sufficient.
Q
Does finer mesh always produce better ceramic quality?
Not necessarily. Finer mesh improves melt completeness and surface smoothness, but if an application's body formulation and firing cycle were designed around a coarser mesh, switching to a much finer mesh without adjusting the recipe can actually cause over-vitrification or altered shrinkage. Mesh should match the specific application, not simply be maximised.
Q
How can I verify a feldspar shipment actually matches its labelled mesh size?
Request sieve analysis (retained-on-sieve percentage) on the Certificate of Analysis for every shipment, not just the labelled mesh number. This shows what percentage of material is coarser than the stated mesh, verifying actual particle size distribution rather than relying on the label alone.
Q
Does Aalok Overseas supply all three mesh grades?
Yes. Aalok Overseas supplies 200, 325, and 500 mesh grades across its potassium feldspar, sodium feldspar, and quartz powder range, milled in-house at its Rajasthan facilities with sieve analysis included on every NABL-accredited Certificate of Analysis.
Search Keywords — 8 Languages
Hindi — हिंदी: फेल्डस्पार मेश साइज़ गाइड · 200 मेश बनाम 325 मेश फेल्डस्पार · 500 मेश फेल्डस्पार · आलोक ओवरसीज फेल्डस्पार मेश
Chinese — 中文: 长石目数选择指南 · 200目与325目长石对比 · 500目长石 · 长石粒度陶瓷 · Aalok Overseas长石目数
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Indonesian — Bahasa: panduan ukuran mesh feldspar · feldspar 200 mesh vs 325 mesh · feldspar 500 mesh · ukuran partikel feldspar keramik
Turkish — Türkçe: feldspat mesh boyutu rehberi · 200 mesh ile 325 mesh feldspat karşılaştırması · 500 mesh feldspat · seramik feldspat parçacık boyutu
Korean — 한국어: 장석 메쉬 크기 가이드 · 200메쉬 대 325메쉬 장석 · 500메쉬 장석 · 세라믹 장석 입자 크기
REQUEST MESH SAMPLE PACK · NABL COA WITH SIEVE ANALYSIS · 200 / 325 / 500 MESH
Contact Aalok Overseas — India's Full-Range Mesh-Graded Feldspar Supplier
Request free samples of 200, 325, or 500 mesh potassium feldspar, sodium feldspar, or quartz powder — with NABL-certified COA including sieve analysis, full XRF chemistry, and LOI. Mine-direct sourced and milled from Rajasthan since 1992.
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