IS 2547 (Part 1) is the specification for gypsum building plaster. IS 2542 (Part 1) gives the test methods.
The limits of IS 2547 that our reports are checked against:
| Property | IS 2547 limit | What it tells you |
|---|---|---|
| Setting time | 10 to 30 minutes | The time that you have to apply and level the mix |
| Bending (transverse) strength | At least 0.49 N/mm² | The strength of the set plaster |
| Left on a 150 µm sieve | Not more than 5% | How fine the powder is |
| Expansion on setting | Not more than 0.2% | How little the plaster moves as it sets |
| Surface hardness (ball indentation) | 3.0 to 4.5 mm for a final coat | How hard the finished surface is |
An NABL laboratory tests SIG-MR against this standard. You can read the reports on the Downloads page.