Gypsum, a reliable natural source of calcium and sulphur. Our gypsum originates from CSR Gyprock. We recycle the gypsum core from damaged gyprock products collected at CSR's manufacturing plants.

CSR Gyprock is made from virtually pure refined gypsum. It is formed into boards with a paper coating which makes up 5% of the total weight.

An analysis of our gypsum conducted by CSU Wagga produced the following results:

Calcium Sulphate (Gypsum)	87.6%
Calcium Carbonate (Lime)	3.26%
Silicon Oxide	3.17%
Paper	3.85%
Other trace elements	1.76%

The type of gypsum we have is commonly called sea gypsum. Its chemical name is calcium sulphate dihydrate (CaSo42H2O). In the CSR plants the gypsum is subjected to a heating process (calcination) to form plaster or calcium sulphate hemi-hydrate (CaSo4 1/2H2O). This compound is then hydrated in a controlled manner to produce the board. In this reaction the plaster is changed back to gypsum. Our product will not set or form a crust after rain.

It is exactly the same type of gypsum as others commonly used in agriculture and has the same effect on plants and soil. The only difference is the purity.

Our recycled gyprock is a reliable source of sulphur. Water has the same effect on our product as it does on other agricultural gypsum. Part of the testing we have done with CSU Wagga was to determine the amount of sulphur dissolved in water. Four different sources of gypsum were tested. After one hour in water the recycled gyprock released similar amounts of sulphur to other samples. Full test results from CSU Wagga are available.

Please contact our office for full details of all test results and the sources of the above information.