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Spray gypsum Espandar Semnan plaster
Espandar Semnan plaster
Iran
The gypsum mixture consists of at least 50% gypsum as the main active adhesive component and maximum 5% lime (calcium hydroxide). Spray plaster is a type of lightweight additive plaster (perlite, heat and sound insulation) that it can be used on all surfaces including brick, earthenware, cement block and so on.
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Spray gypsum Espandar Semnan plaster
Plaster of building adhesives is an air adhesive. Building plaster is obtained by baking gypsum at a temperature of about 180 degrees. The chemical formula of gypsum is calcium sulfate with two water molecules which after boiling, about (75%) of its water is vaporized and the building gypsum is obtained by chemical formula CaSO4.0.5H2O. Pure plaster is white, but impurities cause it to change color.
Advantages of construction gypsum:
- Being early
- Volume Upon Hardening:
- Fire resistance
- The property of being acoustic
- The property of being plastic
- The price is right
- Abundance and availability
Disadvantages of construction gypsum:
- Not resistant to water
- Corrosion in metals
Initial capture (min)
120-160
Secondary capture (min)
300-350
Compressive strength (N / mm2)
2.5
Flexural strength (N / mm2)
4
Consumption per square meter (kg)
9
Dry density (kg / m3)
730-760
Two-day flexural strength
Minimum SO3 (%)
36
Minimum CaO (%)
24
Maximum Na2O (%)
0.3
Maximum MgO (%)
0.6
Maximum H2O (%)
6