99400-01-8

Basic information

• Product Name: calcium sulfate
• Synonyms: CALCIUM SULFATE
• CAS NO: 99400-01-8
• Molecular Formula: CaO4S
• Molecular Weight: 136.14
• Mol File: 99400-01-8.mol
• Article Data: 0

Chemical Properties

• Appearance: /
• Storage Temp.: Hygroscopic, Room Temperature, under inert atmosphere
• Solubility: Water (Slightly)
• CAS DataBase Reference: calcium sulfate(CAS DataBase Reference)
• NIST Chemistry Reference: calcium sulfate(99400-01-8)
• EPA Substance Registry System: calcium sulfate(99400-01-8)

Safety Data

• Hazardous Substances Data: 99400-01-8(Hazardous Substances Data)

Usage

Description

Calcium sulfate, also known as gypsum, is a grayish-white dense powder that occurs naturally in both an anhydrous form (anhydrite) and a hydrated form (gypsum). It is also a byproduct of many chemical reactions. Calcium sulfate anhydrous contains approximately 29% calcium, while calcium sulfate dihydrate contains approximately 23% calcium. It has a wide range of industrial uses, including as a source of sulfur and sulfuric acid, in cements, tiles, plaster, as a soil conditioner, in paints, dyes, polishes, and as a food additive.

Uses

Used in Pharmaceutical Aid:
Calcium sulfate is used as a tablet and capsule diluent.
Used in Food Industry:
Calcium sulfate is used as a filler and baking powder for standardization purposes, a firming agent in canned vegetables, a source of calcium ions in dough, in soft-serve ice cream to produce dryness and stiffness, a calcium ion source for reaction with alginates to form dessert gels, and as a calcium source for food enrichment.
Used in Desiccant Applications:
In the form of β-anhydrite (the nearly anhydrous form), calcium sulfate is used as a desiccant.
Used in Coagulant Applications:
Calcium sulfate is used as a coagulant in products like tofu, which is a bean curd.
Used in Color-Indicating Variants:
When sold as a color-indicating variant under the name "Drierite", calcium sulfate appears blue or pink due to impregnation with cobalt chloride, which functions as a moisture indicator.
Used in Industrial Applications:
Calcium sulfate (CaSO4·2H2O) is commonly used as blackboard chalk.
Used in Natural State:
Unrefined calcium sulfate is a translucent, crystalline white rock, with many forms known, including Alabaster and Gypsum. Selenite, Satin spar, Desert rose, and Gypsum flower are four varieties of Gypsum minerals; all four varieties are crystalline and have the same chemical formulation, CaSO4·2H2O. All varieties of gypsum are very soft minerals (hardness: 2 on Mohs scale), which is the most important identifying characteristic of gypsum.

Preparation

Calcium Sulfate may be prepared by the addition of a soluble calcium salt to a solution of sodium sulfate: CaCl2＋ Na2SO4→CaSO4＋ 2NaCl The product is generally a dihydrate although other hydrates are also known. The CAS numbers of these materials are: 7778-18-9 (anhydrite); 10034-76-1 (hemihydrate); 10101-41-4 (dihydrate).