Gypsum binder (alpha- 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.
APPLICATION
• Production of molds and models in porcelain and ceramic industry, and mechanic engineering;
• Production of dry construction mixes;
• Construction of fire partitions;
• Plugging of wells in oil industry;
• Casting of molds for parts in metallurgy and mechanic engineering.
TECHNICAL SPECIFICATIONS
Divergence from the net mass in accordance with GOST 26871 ± 1kg Produced according to TU 21 RSFSR-153-90, MOD. 15
| base | GVVC-16 |
| 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 minutes Finish (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 |
