硫酸钙

Description

Calcium Sulphate is identified by CAS 7778-18-9, molecular formula CaSO4 and molecular weight 135.91 g/mol. UNII E934B3V59H; ChEBI 31346; InChIKey OSGAYBCDTDRGGQ-UHFFFAOYSA-L. Melting Point: 1450 °C; Solubility: 0.3 % (NIOSH, 2024); Solubility: 0.3%.

Identification

CAS Registry Number	7778-18-9
PubChem CID	24497
Molecular formula	CaSO4
Molecular weight	135.91 g/mol
IUPAC name	calcium sulfate
InChIKey	OSGAYBCDTDRGGQ-UHFFFAOYSA-L
UNII (FDA)	E934B3V59H
ChEBI ID	CHEBI:31346

Computed Descriptors

Molecular Weight	136.14
Hydrogen Bond Donor Count	0
Hydrogen Bond Acceptor Count	4
Rotatable Bond Count	0
Exact Mass	135.9143205
Monoisotopic Mass	135.9143205
Topological Polar Surface Area	88.6
Heavy Atom Count	6
Formal Charge	0
Complexity	62.2

Physical & Chemical Properties

Melting Point	1450 °C
Solubility	0.3 % (NIOSH, 2024)
Solubility	0.3%
Density	2.960
Density	2.9 g/cm³
Density	2.96
Vapor Pressure	0 mmHg (approx) (NIOSH, 2024)
Vapor Pressure	0 mmHg (approx)
Decomposition	1450 °C
Color Additive Status	178.3297

Physical description & handling notes

• Calcium sulfate appears as odorless, white powder or colorless, crystalline solid. Crystals sometimes have a blue, gray or reddish tinge or can be brick red. Density: 2.96 g cm-3.
• Large Crystals; Wet Solid; Liquid; Liquid; Other Solid; Dry Powder; Other Solid; Large Crystals; CBI; Dry Powder; Other Solid
• Fine, white to slightly yellowish-white odourless powder
• Odorless, white powder or colorless, crystalline solid. [Note: May have blue, gray, or reddish tinge; [NIOSH]
• WHITE HYGROSCOPIC POWDER OR CRYSTALLINE POWDER.
• Odorless, white powder or colorless, crystalline solid.

Regulatory Status

Regulatory & Food Contact

FDA Substance added to food: ANTICAKING AGENT OR FREE-FLOW AGENT, DRYING AGENT, FORMULATION AID, LEAVENING AG FDA Inventory of Food Contact Substances Listed in 21 CFR: FCS FIRMING_AGENT; FLOUR_TREATMENT_AGENT; SEQUESTRANT; YEAST_FOO: Food Additives ANTICAKING AGENT OR FREE-FLOW AGENT, DRYING AGENT, FORMULATION AID, LEAVENING AGENT, LUBRICANT OR RELEASE AGEN NOT LIMITED NMRS 53/TRS 539-JECFA 17/37

GHS notification summary

93.5% (1291 / 1381)

GHS Hazard Classification

GHS notification summary	93.5% (1291 / 1381)
Reported hazard statements	H335

Documented Uses

• Gypsum is the dihydrate form and Plaster of Paris is the hemihydrate form. [NIOSH] Used in cement and paper filler (insoluble anhydrite), in a drying agent (soluble anhydrite), in wall plaster and wallboard (hemihydrate), and in soil treatment, Plaster of Paris, Portland cement, water clarification, animal feed, and calcium supplements in food (dihydrate gypsum); The natural forms are the mineral anhydrite (CaSO4) and the dihydrate, gypsum (CaSO4 . 2H2O). [ACGIH]
• Cement Producing [Category: Industry]
• Farming (Feed Additives) [Category: Industry]
• HEAVY CLAY SOIL CONDITIONER, CARRIER /DIHYDRATE/
• USED FOR WALL PLASTERS; WALL BOARD; TILES & BLOCKS FOR BUILDING INDUSTRY; MOLDINGS; STATUARY; IN PAPER INDUSTRY /HEMIHYDRATE/
• For more Uses (Complete) data for CALCIUM SULFATE (10 total), please visit the HSDB record page.

Synonyms

CALCIUM SULFATE; 7778-18-9; Anhydrous gypsum; Drierite; Karstenite; Muriacite; Basic calcium sulfate; Calcium sulfate, anhydrous; calcium sulphate; Calcium sulfate anhydrous; Crysalba; Osteoset; Thiolite; Anhydrous sulfate of lime; Natural anhydrite; Sulfuric acid, calcium salt (1:1)

Frequently Asked Questions

What are the CAS number and molecular formula of Calcium Sulphate?

CAS 7778-18-9; molecular formula CaSO4; molecular weight 135.91 g/mol.

What other names is Calcium Sulphate known by?

CALCIUM SULFATE, 7778-18-9, Anhydrous gypsum, Drierite, Karstenite, Muriacite.

What is the regulatory status of Calcium Sulphate?

Documented regulatory listings: FDA Substance added to food: ANTICAKING AGENT OR FREE-FLOW AGENT, DRYING AGENT, FORMULATION AID, LEAVENING AG; FDA Inventory of Food Contact Substances Listed in 21 CFR: FCS; FIRMING_AGENT; FLOUR_TREATMENT_AGENT; SEQUESTRANT; YEAST_FOO: Food Additives.

Is Calcium Sulphate classified as hazardous?

93.5% of GHS notifications report no hazard classification (1291 of 1381).

What are the key physical properties of Calcium Sulphate?

Melting Point: 1450 °C; Solubility: 0.3 % (NIOSH, 2024); Solubility: 0.3%; Density: 2.960.

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.