Refractory Materials are usually non-metallic materials having those chemical and physical properties that make them applicable for structures, or as components of systems, that are exposed to environments above 1,000 °F (811 K; 538 °C)。

Sodium sulfate




Specs.:
Item Super-fine Standard
Na2SO4 % min 99 99
Non-soluble in water% max 0.1 0.1
CaSO4 %max 0.1  
NaC1 % max 0.003 0.002
MgSO4 % max 0.5  
Moisture % max   0.1
PH 6-8 6-8
Size:1-60mesh   90