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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.
Package
25kg/bag 20’FCL can hold 9 tons
Related Keywords
gips; Gypsite; Phosphogypsum; GYPSUM; CALCIUM SULFATE 0.5-WATER; CALCIUM SULFATE, 1/2-HYDRATE; CALCIUMSULFATE BINDER CAB 30; CALCIUM SULFATE CALCINED
