What is the specified initial setting time for this plaster?

It must be between 10 and 20 minutes, as per Clause 5.1 and Table 1.

What is the minimum required compressive strength?

The average compressive strength must be at least 14.0 N/mm², according to Clause 6.1 and Table 1.

What is the fineness requirement?

The residue retained on a 150-micron IS sieve shall not be more than 1.0 percent by mass (Clause 3.1).

Is this plaster suitable for general wall plastering?

No, this is a specialized fast-setting plaster specifically formulated for casting fibrous plaster boards, not for direct wall application.

IS 8272

: 1984

gypsum plaster for use in the manufacture of fibrous plaster boards

CurrentSpecializedSpecificationBIMMaterials Science · Building Limes and Gypsum Products

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This standard specifies the requirements for gypsum plaster used to manufacture fibrous plaster boards. It outlines the necessary physical properties, including fineness, setting time, transverse strength, and compressive strength, and references the appropriate testing methods.

gypsum plaster for use in the manufacture of fibrous plaster boards

Quick Reference Values

Fineness (residue on 150-micron sieve), max1.0 % by mass

Initial Setting Time10 to 20 minutes

Final Setting Time, max30 minutes

Compressive Strength, min14.0 N/mm²

Transverse Strength (breaking load), min30 N

Practical Notes

This plaster has a rapid setting time (10-20 mins) which is critical for the casting and production of fibrous plaster boards.

The transverse strength test is a key indicator of the finished board's ability to resist breakage during handling and installation.

Proper dry storage is essential to prevent moisture exposure, which can cause premature setting and ruin the plaster.