CHEMICAL CHARACTERISTIC: 
SiO238%
Al2O313%
Fe2O312%
MgO15%
CaO2.3%
K2O4.8%
LOI, after expansion2.0%
PHYSICAL CHARACTERISTICS: 
Combustion TempWill not burn
pH7.0-7.1 (in water)
Cation Exchange Capacity50-100 M.eq/100g (typically)
Moisture<2.5% (total of free and intrinsic moistur
ColorTan or off white
Particle ShapeAccordion-like
Hardness1.5-2.0 mohs
Density5.0-10.0 lbs/ft3
Fusion TemperatureOver 2,200 degrees
Particle Size Distribution (as cumulative % by weight, typica:   
MeshGrade3Grade4Grade5
80-10  
20 0-30 
3070-10040-70 
40  10-40
50 65-9530-70
100 90-10070-100
ORIGIN:USA