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| Terra Alba #1 |
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| Calcium suifate dihydrate |
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| 10101-41-4 |
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USG Calciun Sulfate Fillers
Extenders
TERRA ALBA #1 calcium sulfate dihydrate, is made by fine grinding and air separating a select, high purity, white gypsum containing about 20% water of crystallization.
Depending upon vapor pressure, relative humidity, loading levels, etc., this water of crystallization, or combined water as it is often called, starts being released as the TERRA ALBA is heated above 50C. By about 180C, 75% of the combined water has been released. Water is not totally removed until temperatures exceed 400C.ln formulations processed at room temperature, TERRA ALBA #1 can function as a flame retarding filler. |
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Typical Physical Properties:
Specific Gravity: 2.32
Mohs Hardness: 2-3
Loose Bulk Density (lbs./ft. 3): 42
Packed Bulk Density (lbs./ft. 3): 62
pH-10% Slurry: 7.3
Refractive Index: 1.52
Oil Absorption: 23-25
Reflectance: 89.1,- 0.9, 2.9
Median Particle Size (microns): 12.0
Top Particle Size (microns): 150
Typical Chemical Analysis: %:
CaSO4-2H2O: 98.0
CaSO4: 0.7
CaCO3-MgCO3: 0.5
CaCO3: 0.3
Aggregate: 0.3
Free Moisture at 45C: 0.1
Combined Moisture at 225C: 20.3
Typical Particle Size Data:
Sieve Analysis: %:
Through 50 mesh (300 microns): 100.0
Through 100 mesh (150 microns): 99.9
Through 200 mesh ( 75 microns): 99.8
Through 325 mesh ( 44 microns): 97.0
Through 425 mesh ( 32 microns): 91.8
Weight Distribution:
% Smaller Than:
20 microns: 71.8
12 microns (median): 50.0
10 microns: 42.0
5 microns: 15.0
2 microns: 4.0
1 micron: 1.0 |
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