Specifications
| Fe₂O₃ | 0.14% |
|---|---|
| SiO₂ | 56.64% |
| Al₂O₃ | 20.86% |
| K₂O | 9.24% |
| Na₂O | 6.39% |
| CaO | 5.34% |
| MgO | 0.17% |
| TiO₂ | 0.03% |
Description
GP20 is our flagship high-expansion nepheline powder. Its uniquely high CaO content (5.34%) provides distinctive thermal expansion properties highly valued in matte glaze formulations and ceramic frit production. The high combined K₂O (9.24%) and Na₂O (6.39%) give GP20 the highest total alkali content in our nepheline range at 15.63%, making it an extremely powerful flux. In matte glaze formulations, GP20's balanced chemistry promotes controlled devitrification during cooling — creating smooth, uniform matte surfaces. For frit production, GP20 serves as a natural source of five useful oxides (Al₂O₃, SiO₂, K₂O, Na₂O, CaO) from a single raw material. The absence of free silica is an additional advantage for frit furnace operations and worker safety. Ceramic technicians recommend using GP20 at 15-25% of matte glaze formulation weight. Combine with zinc oxide for enhanced matte effect. Control cooling rate between 1100-900°C for optimal crystal development.
Applications
Packaging
1,200kg FIBC jumbo bags (standard) and 50kg PP woven bags. Custom packaging available.
Quality
COA with every shipment. Independent verification by Foshan Youbo Lab.
