Chalk making school plaster power low price

Product Detail

Chalk making school plaster power low price
Product Description
Gypsum retarder for gypsum powder
Usually white, colorless, colorless and transparent crystals are called transparent gypsum, sometimes they appear gray, light yellow, light brown and other colors due to impurities. Striped white. Transparent. Glass luster, cleavage surface pearl luster, fiber aggregate silk luster.
The cleavage is very complete and moderate, and the cleavage pieces are split into diamond shapes with angles of 66° and 114°. Fragile. Hardness 1.5~2. There are slight variations in different directions. Relative density 2.3. Gypsum powder is one of the five major gel materials. It plays an important role in the national economy. It is widely used in fields such as construction, building materials, industrial molds and art models, chemical industry and agriculture, food processing and medical beauty. It is an important industrial raw material.
Specification
external
Splits evenly without clumping
visual
Water holding capacity (mg/cm2)
≤8
water consistency
75%
GB/T2419
Compressive strength (MPA)
65
GB/T17671
2H bending strength (Mpa)
10
Initial setting time
5-7 minutes
JC/T547-1994
final solidification time
15-20 minutes
Shrinkage (%)
≤0.30
JGJ70
application
Main applications:
1. Building materials: making gypsum boards, suspended ceilings, gypsum blocks, etc.
2. Used as additive in cement industry
3. Agriculture that improves land
4. Medical purposes: dental teeth, POP bandages, etc.
5. Art sculpture: plaster cornice, craftsmanship
6. Drywall joint compound powder.
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