gypsum being a hazaardous mineral
No RER. Gypsum is a non-hazardous mineral.
Pure gypsum is a white rock but sometimes impurities colour it grey,
brown or pink. Its scientific name is calcium sulphate dihydrate and
its chemical formula is CaSO42H2O. This means that, for every
molecule of gypsum, there are two molecules of water.
If a piece of gypsum is ground to powder and heated, it will lose
about three quarters of its water. If this powder is then mixed with
water, the paste or slurry will set rock hard. The
chemically-combined water, previously removed, has re-combined and
the material has reverted to the original composition of the rock.
The powder is called hemi-hydrate gypsum plaster (Plaster of Paris).
Gypsum plaster has been used in buildings for literally thousands of
Gypsum is found in every continent of the world.
From 1st April 2009 the guidance on landfill changed. Visible gypsum
waste can no longer be disposed to general landfill, but must go to
a separate cell for non-hazardous high-sulphate material. This is
because gypsum mixed with waste organic material can give off
hydrogen sulphide gas (bad eggs smell).
Bottom line Ms RER - Gypsum is a non-hazardous mineral.
Please check your info.!