What is the main process this standard covers?

It covers the calcination of raw gypsum to produce hemi-hydrate gypsum plaster (Plaster of Paris) in a mechanized pan.

What standard is used for testing the properties of the manufactured plaster?

IS 2547 (Methods of test for gypsum plaster, concrete and products) is referenced for testing procedures.

What is the recommended purity for the raw gypsum?

The standard recommends a minimum purity of 85 percent for the raw gypsum mineral (CaSO4.2H2O) as per Clause 3.1.

IS 13001

: 1991

Guidelines for the manufacture of gypsum plaster in Mechanized pan system

CurrentSpecializedGuidelinesBIMMaterials Science · Building Limes and Gypsum Products

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This standard provides guidelines for the manufacturing of gypsum plaster (hemi-hydrate or Plaster of Paris) using a mechanized pan system. It covers the quality of raw materials, the manufacturing process including calcination, and the requirements for the finished product.

Guidelines for the manufacture of gypsum plaster in Mechanized pan system

Quick Reference Values

Purity of raw gypsum mineral (min)85% CaSO4.2H2O

Initial setting time5 to 15 min

Final setting time (max)30 min

Fineness (retained on 150-micron IS sieve, max)5%

Calcination temperature range140°C to 160°C

Practical Notes

Strict temperature control during calcination (140-160°C) is crucial to avoid producing 'dead-burnt' plaster which has poor setting properties.

The mechanized pan system described offers better heat distribution and process control compared to traditional open pan or kiln methods, leading to a more consistent product.

The final product is hygroscopic; proper packaging in moisture-proof bags is essential to prevent premature setting and loss of quality.