Gypsum binder (al- hemihydrate of calcium sulfate CaSO4 * 0.5 H2O) is produced from natural gypsum stone and is a white fine powder obtained by grinding of natural gypsum stone with further heat treating it in an autoclave, followed by milling and separation.Alternative names are al gypsum, technical gypsum, and high-strength gypsum.Environmentally friendly material; there is the expert opinion. The products are certified in GOST R system
Divergence from the net mass in accordance with GOST 26871 ± 1kgProduced according to TU 21 RSFSR-153-90, MOD. 15
| Water consumption for paste of standard consistency | Not more than 41% of weight of the binder |
| Setting time of standard consistency | Start (loss of solution mobility) - no earlier than 4.5 minutesFinish (complete solution hardening) - not later than 20 minutes |
| Beating rate | The maximum residue on a sieve with a mesh size of 0.2 mm in clear - not more than 1% |
| Breaking strength of sample bars aged of 2 hours | Under bending - not less than 6 MPa. Under compression - not less than 16 MPa |
| Guaranteed storage life | 6 months from the date of shipment in unopened original package. Storage in dry indoor spaces on wooden pallets. Material should be fully utilized after opening the original packaging |
| Content of metal impurities in the binder | Not more than 10 mg/kg |
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