When you receive our samples (1-5 kg per grade), here is the recommended testing protocol to evaluate quality for your specific production conditions.
Technical Details
Step 1 β Visual inspection: the powder should be fine, free-flowing, white to light grey, with no visible dark specks, lumps, or discoloration. Any yellow or brown tint suggests high iron content. Step 2 β Moisture test: weigh 50g, dry at 110 degrees C for 2 hours, reweigh. Moisture should be below 1.0%. Step 3 β Press firing discs: press at least 3 discs per grade at 40mm diameter using consistent pressure (approximately 200 kg/cm2). Fire at 1200 degrees C with a standard cycle (5 degrees C per minute heating, 30-minute soak, natural cooling).
Practical Application
Measure fired disc whiteness using a spectrophotometer (L*a*b*) if available, or compare visually under standardized lighting. Step 4 β Formulation trial: prepare your standard body recipe replacing the current feldspar with our nepheline (use 82% of the feldspar weight β see our conversion guide). Press and fire test tiles. Measure water absorption, linear shrinkage, and MOR. Compare with your current production results. Step 5 β COA verification: compare your lab results with our COA data.
Our Products & Recommendation
The whiteness and chemistry should be consistent within normal measurement uncertainty. Request samples for testing through our contact channels..
Questions about raw material science?
Our technical team provides formulation support and samples for testing.
