Colour
|
White
|
Refractive Index
|
1.5
|
Free Moisture,
Maximum
|
0.5%
|
pH (of slurry water)
|
6.5 - 8.0
|
Specific Gravity
|
2.2 - 2.4 |
Bulk Density
(loose weight)
|
As desired, but usually in the
2 - 25 lg/ft3 range (32 - 400 kg/m3)
|
Mesh Size Available
|
As desired,
4 - 8 mesh and finer
|
Softening Point
|
1600 - 2000°F (871 - 1093°C)
|
Fusion Point
|
2300 - 2450°F (1260 - 1343°C)
|
Specific Heat
|
0.2 Btu/lb•°F (837 J/kg•K)
|
Thermal Conductivity
at 75°F (24°C)
|
27 - 41 Btu•in/h•ft2•°F
(0.04 - 0.06 W/m•K)
|
Solubility
|
• Soluble in hot concentrated alkali and HF
• Moderately soluble (<10%) in NaOH
• Slightly soluble (<3%) in mineral acids (1N)
• Very lightly soluble (<1%) in water or weak acids
|
