Calcium sulfate
Calcium sulfate is indexed in ChEBI under CHEBI:31346, with the reported formula Ca.O4S. Use the source record and structural identifiers below to confirm the material you need. — ChEBI
Safety documents & references
2 indexed referencesFind a product-specific SDS
Safety guides and government classification records are not a manufacturer’s SDS. Match supplier, product number, concentration, physical form, region and revision before using a document.
Identity & molecular properties
Source-linked values| CAS number | 7778-18-9 | ChEBI ↗ |
| Molecular formula | Ca.O4S | ChEBI ↗ |
| Molar mass | 136.141 g/mol | ChEBI ↗ |
| Monoisotopic mass | 135.91432 Da | ChEBI ↗ |
| Formal charge | 0 | ChEBI ↗ |
| ChEBI identifier | CHEBI:31346 | ChEBI ↗ |
Cross-source molecular data
PubChem| Molar mass | 136.14 g/mol | PubChem ↗ |
| Exact mass | 135.9143205 Da | PubChem ↗ |
PubChem computed values are shown separately from the ChEBI record. An exact InChIKey match was used to connect the records. Molecular descriptors do not describe a supplied product’s purity, particle size or performance.
Names & structural identifiers
Copy any identifiercalcium sulfatecalcium sulfateOSGAYBCDTDRGGQ-UHFFFAOYSA-LO=S(=O)([O-])[O-].[Ca+2]InChI=1S/Ca.H2O4S/c;1-5(2,3)4/h;(H2,1,2,3,4)/q+2;/p-2Classification & relationships
ChEBI ontologySafety classification · Japan
NITE / Japanese governmentCalcium sulfate · H27-A-014/C-014A_P
| Endpoint | Reported classification |
|---|---|
| Specific target organ toxicity - Single exposure | Category 3 （Respiratory tract irritation） |
Selected source-reported endpoints. Other endpoints, rationales and conditions remain in the original classification. Missing or unlisted information does not mean non-hazardous. This is not a global classification or transport decision.
Read the original NITE classificationMass ↔ amount of substance
Calculated from sourced massUses 136.141 g/mol from ChEBI. Assumes the substance described by this record; no purity or concentration correction is applied.
Elemental composition
Theoretical mass fractionsOCaSCalculated theoretical mass fractions from the reported formula and PubChem periodic-table atomic masses. These are not assay or purity results.
Research & patent references
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Sources & record history
Checked 27 Sep 2026Release 255, 9 September 2026. ChEBI three-star (manually annotated) source entry. View original record ↗ · CC BY 4.0
PubCAS formats source data, connects references and computes explicitly labelled conversions. CAS cross-references are supplied by ChEBI; they do not constitute CAS verification or endorsement.