- Chemical Family:Calcium Salts
- Functions:Filler
- Features:Good Green Strength, Flame Retardant
- Synonyms:Basic calcium sulfate, Calcium sulfate (CaSO4), Calcium sulphate, Sulfuric acid calcium salt, Sulfuric acid calcium(2+) salt (1:1)
USG Corporation TERRA ALBA NO. 1, Calcium Sulfate Dihydrate Filler is a flame-retarding filler. It offers low abrasion to processing equipment and is available in 50 lb. bags or 2,000 semi-bulk from USG’s Southard, Oklahoma plant. USG Terra Alba No. 1 Calcium Sulfate Dihydrate Filler is made by fine grinding and air separating a select, high purity white gypsum containing approximately 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 USG Terra Alba No. 1 Calcium Sulfate Dihydrate Filler is heated above 50 °C. At approximately 180 °C, 75% of the combined water has been released. Water is not totally removed until temperatures exceed 400 °C.