Analysis

Silicon…………………………………… 
33.8
Aluminium………………………………     
7.2
Potassium………………………………..     
3.5
Sodium……………………………………   
3.4
Iron………………………………………     
0.6
Calcium…………………………………..   
0.6
Magnesium……………………………….    
0.2
Traces…………………………………….    
0.2
Oxygen (by difference)………………….. 
47.5
Net Total………………………………..   
97.5
Bound water……………………………..   
3
Total…………………………………….. 
100.0 percent

Properties

Color……………………………  white
Refractive index………………...  1.5
Free Moisture maximum………..  0.5
pH(of water slurry)……………...  6.5-8.0
Specific gravity………………….  2.2-2.4
Bulk Density…………………….  As desired but usually in the 2.25lb/ft3 range 
(loose weight)                                  (32-400kg/m3)
Mesh sizes available…………….  As desired 4-8 mesh and finer                                                       
Softening point…………………..  1600-2000 F (871-1093 F)
Fusion point……………………...  2300-2450 F (1260-1343 C)
Specific Heat……………………..  0.2btu/lb F (837J/KG.K)
Thermal conductivity…………….. 27.11 btu.in/h.ft2 F
At 75 F (24 C)                                  (04-06 w/m.k)
Solubility…………………………  soluble in hot concentrated alkali
                                                         and in HF moderately soluble (<10%)
in 1 N NaOH slightly soluble(<3%) 
Mineral acids (1N) very slightly soluble
(<1%) in water orweak acids.