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USG Corporation TERRA ALBA NO. 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.

Chemical Family: Calcium Salts

Functions: Filler

Features: Flame Retardant, Good Green Strength

Synonyms: Basic calcium sulfate, Calcium sulfate (CaSO4), Calcium sulphate, Sulfuric acid calcium salt, Sulfuric acid calcium(2+) salt (1:1)

Technical Data SheetSafety Data Sheet
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Knowde Enhanced TDS

Identification & Functionality

Chemical Family

Calcium Salts

Chemical Name

Calcium Sulfate

Plastics & Elastomers Functions

Filler

CAS No.
7778-18-9
EC No.
231-900-3
Technologies

Elastomers,

Plastics

Product Families

Elastomers — Elastomer Additives

Fillers & Extenders

Plastics — Polymer Additives

Fillers & Extenders

Features & Benefits

Materials Features

Flame Retardant,

Good Green Strength

Properties

Typical Properties
ValueUnitsTest Method / Conditions
Specific Gravity2.3——
pH (10% Slurry)7.3——
Mohs Hardness2 - 3——
Refractive Index1.5——
Oil Absorption23 - 25——
Loose Bulk Density 42lbs./ft.3—
Packed Bulk Density 62lbs./ft.3—
L, a, b values88.0, 0.8, 4.3——
Median Particle Size 13microns—
Top Particle Size 150microns—
CaSO4 • 2H2O98%—
CaCO3 • MgCO30.5%—
CaCO30.5%—
CaSO40.7%—
Aggregate0.3%—
Free Moisture at 45°C0.1%—
Combined Moisture19%—

Packaging & Availability

Packaging Type

Bags,

Bulk

Storage & Handling

Storage & Use

When properly used, USG Terra Alba No. 1 Calcium Sulfate Dihydrate Filler is easy to work with. Keep indoors at temperatures between 65 °F – 75 °F (18 °C – 24 °C) and 45% – 55% RH. Do not stack more than two pallets high. Keep from drafts. Rotate stock. USG Terra Alba No. 1 Calcium Sulfate Dihydrate Filler should be used within one year of the manufacturing date located on the package. Always follow handling and use directions and safety warnings on the package. USG Terra Alba No. 1 Calcium Sulfate Dihydrate Filler is not approved for use in food and pharmaceutical applications