Gypsum


Gypsum is an evaporite mineral most commonly found in layered sedimentary deposits in association with halite, anhydrite, sulfur, calcite and dolomite. Gypsum (CaSO4.2H2O) is very similar to Anhydrite (CaSO4). The chemical difference is that gypsum contains two waters and anhydrite is without water. Gypsum is the most common sulfate mineral.


Gypsum uses include: manufacture of wallboard, cement, plaster of Paris, soil conditioning, a hardening retarder in Portland cement. Varieties of gypsum known as "satin spar" and "alabaster" are used for a variety of ornamental purpose.


Chemical Composition hydrous calcium sulphate, CaSO4.2H2O


Specifications:


Agriculture Grade:


This is perfect material for soil improvement. We market under "MATRIX" brand which is well-known in Asia/Africa market.

  • Coarse grain (larger than 100 mesh) for hand or machine casting on soil.
  • Fine grain (smaller than 100 mesh) for sprinkle with water or pH adjustment for fish ponds.

We supply in 25 kg 2-ply bag, loose sling or an pallet with wrapping. Minimum order is 500 MT per shipment. OEM is also welcome.



Tests Norms
CaS04•2H20 Calcium Sulfate Dihydrate 85.0% - 95.0%
Calcium 22.5 % Min
Sulphur 17% Min
Moisture 0.5% Max
Size Fine 0-1.5mm / Powder 60-200 MESH



Cement Grade:

Another major use of gypsum is in the cement industry, where it is added at the rate of 2–5% to cement clinker prior to final grinding to retard the setting rate of concrete. Cement-grade gypsum tolerates higher NaCl (0.5–0.6% maximum) and insolubles (6% has been used).


Our cement-grade gypsum specifications are:


Tests Norms
CaS04•2H20 Purity 85.0% - 95.0%
Moisture ≤ 5%
Size 0 - 2"