Ceramics and clay are typically screened at 10 to 400 mesh (2,000 to 37 microns) depending on the application. Crude clay scalping uses 10 to 20 mesh, dry ceramic powder classification uses 40 to 200 mesh, and ceramic slip and glaze screening requires 80 to 400 mesh for defect-free fired surfaces.
Screening is a critical quality control step in ceramic manufacturing because a single oversize particle or contaminant can cause defects visible in the finished product. ScreenerKing provides replacement screens for ceramic manufacturers processing both dry powders and wet slips.
Recommended Mesh Sizes by Application
| Material / Application | Mesh Size | Micron Size | Purpose |
|---|---|---|---|
| Crude clay / ball clay — scalping | 10–20 mesh | 2,000–841 µm | Remove grit, stones, and oversize lumps |
| Kaolin — processed (dry) | 200–325 mesh | 75–45 µm | Fine classification for paper and ceramic grade |
| Kaolin slurry — wet screening | 200–400 mesh | 75–37 µm | Remove grit and contaminants from slurry |
| Spray-dried ceramic granules (tile body) | 10–30 mesh | 2,000–595 µm | Grade granule size for uniform pressing |
| Alumina powder (Al2O3) | 100–325 mesh | 150–45 µm | Classification for technical ceramics |
| Zirconia powder (ZrO2) | 200–400 mesh | 75–37 µm | Fine screening for dental and technical ceramics |
| Ceramic glaze slip | 80–200 mesh | 180–75 µm | Remove agglomerates and unmilled particles |
| Ceramic frit (ground) | 60–200 mesh | 250–75 µm | Grade frit particle size for glaze consistency |
| Feldspar | 40–200 mesh | 400–75 µm | Grade for ceramic body and glaze formulations |
Factors That Affect Mesh Selection for Ceramics and Clay
- Wet vs. dry processing: Ceramic processing uses both dry powder and wet slip screening. Wet screening typically requires finer mesh and screeners configured for liquid handling with proper gaskets and drainage.
- Abrasion: Alumina, zirconia, and silica are highly abrasive. Screens wear rapidly in ceramic applications. Budget for frequent replacements and keep spares in stock.
- Fired surface quality: For glazes and finished surfaces, any oversize particle causes a visible defect. The finer the mesh, the smoother the fired finish. Premium ceramics demand 200+ mesh glaze screening.
- Spray-dried granule size: Tile pressing requires granules within a specific size range for uniform die filling. Multi-deck screening with upper and lower mesh sizes ensures granules meet specification.
- Slip viscosity: Thicker, higher-viscosity slips screen more slowly. Adjust slip properties or screener size to maintain throughput.
Screen Material Recommendations
304 stainless steel is the standard for most ceramic and clay applications, handling abrasion and resisting corrosion in both dry and wet environments.
316 stainless steel is recommended for wet processing with acidic slips or aggressive cleaning chemicals.
T-430 stainless steel is not commonly used in ceramics but can serve where magnetic contamination detection is required.
Equipment Recommendations
- Studio pottery and small batch (under 500 lb/hr): ScreenerKing SiftPro 18" — glaze slip screening and small-batch ceramic processing.
- Mid-volume producers (500–5,000 lb/hr): ScreenerKing SiftPro 24" or 30" — production screening for pottery, technical ceramics, and ingredient suppliers.
- Tile and sanitaryware plants (5,000–15,000 lb/hr): ScreenerKing SiftPro 48 (48") — industrial-capacity screening for spray-dried granules and slip.
- Large ceramic producers (15,000+ lb/hr): ScreenerKing SiftPro 60 — maximum throughput for large factories and raw material processors.
Frequently Asked Questions
What mesh size is used for screening ceramic glaze slip?
Ceramic glaze slip is screened at 80 to 200 mesh (180 to 75 microns). Standard glazes use 80 mesh, fine glazes use 120 to 200 mesh. Industrial screening uses 100 to 200 mesh to remove agglomerates that cause defects.
What mesh size is used for kaolin clay?
Crude kaolin is scalped at 10 to 20 mesh. Processed kaolin is screened at 200 to 325 mesh (75 to 45 microns). Kaolin slurry is wet-screened at 200 to 400 mesh for highest purity.
Can I use a vibratory screener for wet ceramic slip?
Yes. Vibratory screeners handle wet slip effectively. Use 304 or 316 SS screens and configure the screener with appropriate gaskets and drainage. ScreenerKing screeners work for wet or dry ceramic screening.
