CALCIUM SULFATE HEMIHYDRATE Cas 13397-24-5 - Image 2

CALCIUM SULFATE HEMIHYDRATE Cas 13397-24-5

CAS:13397-24-5
Molecular Formula:CaH2O5S
Molecular Weight:154.16
EINECS:603-783-2
Synonyms:gips; Gypsite; Phosphogypsum; GYPSUM; CALCIUM SULFATE 0.5-WATER; CALCIUM SULFATE, 1/2-HYDRATE; CALCIUMSULFATE BINDER CAB 30; CALCIUM SULFATE CALCINED

What is CALCIUM SULFATE HEMIHYDRATE

Phosphorus-containing gypsum is a by-product of wet phosphoric acid production. Due to different production processes, there are phosphorus-containing dihydrate gypsum (CaSO4·2H2O) and hemihydrate gypsum (CaChemicalbookSO5·1/2H2O). In addition to calcium sulfate, the main ingredients also contain a small amount of undecomposed phosphate rock powder, free phosphoric acid, iron phosphate, aluminum phosphate and fluorosilicate and other impurities.

Specification

Clotting time	Initial setting time	≥60min	210min
	Final setting time	≤480min	225min
Water retention rate		≥80%	88%
strength	Flexural strength	≥2.0MPa	2.9MPa
	Compressive strength	≥4.0MPa	8.9MPa
	Tensile bond strength	≥0.4MPa	0.5MPa
Calcium sulfate content		≥30%	38%
pH value		≥7	12
radionuclide limits	Internal exposure index IRa	≤1.0	0.3
	External exposure index Ir	≤1.0	0.2
VOC content		≤10g/kg	not detected
Formaldehyde content		≤50mg/kg	not detected
Total content of benzene series [limited to benzene, toluene, xylene (including ethylbenzene)]		≤100mg/kg	not detected
Total lead (Pb) content		≤90mg/kg	not detected
Soluble heavy metal content	Cadmium (Cd) content	≤75mg/kg	not detected
	Chromium (Cr) content	≤60mg/kg	not detected
	Mercury (Hg) content	≤60mg/kg	not detected

Application

It is used as a raw material for the production of gypsum boards and superphosphate fertilizers. It can also be used as a cement retarder, an additive for bricks, etc.