Technical data sheet
SIG-MR
One-coat gypsum plaster
Description
SIG-MR is a one-coat gypsum plaster for internal walls and ceilings. One coat of 6 to 20 mm gives a white, flat and smooth surface. It needs no water curing.
We make SIG-MR at Panvel. NABL laboratories test it against IS 2547. The QR code on every bag opens the test certificate of that batch.
Where to use
- Brick and AAC block: plaster directly.
- Mivan and RCC: Gypbond Pro goes on first. Then plaster.
- One coat, 6 to 20 mm thick.
Features
- 27 sq ft from one 25 kg bag at 13 mm. Measured on a site wall, losses included.
- 93%+ white. A whiter base needs less putty and gives paint a brighter colour.
- Sets in 15 minutes. Or up to 30 minutes, made to order.
- One coat. 6 to 20 mm in a single coat.
- No water curing. No curing wait before the next trade.
- Does not burn. Gypsum is non-combustible.
- Lighter. Less load than sand-cement plaster.
- Low heat flow. Gypsum conducts little heat.
- NABL tested. Eight results against IS 2547.
- QR on every bag. Scan it. Read the test report.
Technical data
| Property | Value | Standard or basis | Source |
|---|---|---|---|
| Coverage | 27 sq ft per 25 kg bag at 13 mm (1.08 sq ft per kg) | Measured on a site wall, losses included | Site measurement |
| Whiteness | 93%+ | Reflectance | Company test |
| Setting time | 15 min standard; up to 30 min to order | IS 2547: 10 to 30 min | NABL report |
| Transverse (bending) strength | 4.23 N/mm² | IS 2547: not less than 0.49 N/mm². Average of six bars. | NABL report |
| Fineness | 1.65% left on a 150 µm sieve | IS 2547: not more than 5% | NABL report |
| Surface hardness | 3.9 mm ball indentation | IS 2547: 3.0 to 4.5 mm | NABL report |
| Expansion on setting | 0.10% | IS 2547: not more than 0.2% | NABL report |
| Pull-off strength on hollow block, with no bonding coat | about 1 N/mm² | At 35 days. Report figure: 0.96 N/mm², the average of three cores. | NABL report |
| pH | about 7 | Our range: 6 to 8 | Company test |
| Bulk density | 720 kg/m³ | Untapped powder. Our range: 600 to 800 | Company test |
| Heat on setting | about 50 °C | Peak temperature as it sets. Our range: 48 to 53 °C | Company test |
| Sulphur trioxide (SO₃) | 56.18% | IS 2547: not less than 35% | NABL report |
| Calcium oxide (CaO) | 38.15% | IS 2547: not less than two-thirds of SO₃ (37.45%) | NABL report |
| Loss on ignition | 6.18% | IS 2547: 4 to 9% | NABL report |
| Shelf life | 1 year | In the closed bag, in a dry store, off the floor | |
| Mix | 1 water : 1.25 plaster | ||
| Thickness | 6 to 20 mm in one coat | ||
| Working time | Use each mix before it sets | Final set: 15 min standard, up to 30 min to order. General practice: mix only what you can apply in this time. Do not add water to a mix that has started to set. | |
| Drying time before paint | Typical: 3 days | General practice for gypsum plaster. The time depends on the thickness and the weather. The plaster must be dry before you prime and paint. | |
| Tools | Mixing tray, trowel, straightedge | General practice. Use clean tools and clean water. | |
| Cleaning | Wash the tools with water before the plaster sets | General practice. Set plaster on a tool or in the tray makes the next mix set faster. |
The latest result of each test. Strength, hardness, fineness, setting and expansion are from one sample, July 2026. Setting time is the final set of a test sample: site time depends on water, batch and weather. A line marked "typical" or "general practice" is common to gypsum plasters: it is not a test result of this product.
Coverage
| Thickness | sq ft per kg | sq ft per 25 kg bag | 25 kg bags for 1,000 sq ft |
|---|---|---|---|
| 10 mm | 1.40 | 35.1 | 29 |
| 13 mm | 1.08 | 27.0 | 38 |
| 15 mm | 0.94 | 23.4 | 43 |
| 20 mm | 0.70 | 17.6 | 57 |
27 sq ft from one 25 kg bag at 13 mm is measured on site. Coverage at another thickness is scaled in proportion. Bags are whole bags.
Application
- Clean. The wall must have no dust and no oil.
- Prime. Mivan and RCC only: roll on one coat of Gypbond Pro. Let it dry for 24 hours. Plaster within 14 days of coating. Brick and AAC block need no bonding coat.
- Measure. 1 part water to 1.25 parts plaster.
- Mix. Mix until smooth.
- Apply. One coat, 6 to 20 mm thick.
- Finish. Level the surface. Then trowel it.
- No water curing. Do not water the plaster after it sets.
Limits
- For internal walls and ceilings.
- One coat is not more than 20 mm.
- On Mivan and RCC, do not plaster without Gypbond Pro.
Packaging
- SIG-MR-25: 25 kg bag.
- SIG-MR-20: 20 kg bag.
- SIG-MR-15: 15 kg bag.
- A QR code on every bag opens the test certificate of that batch.
Storage and shelf life
- Store the bags closed, in a dry and covered place.
- Keep them off the floor and away from damp walls.
- General practice, from IS 4082 for bagged cement: stack not more than 10 bags high.
- Shelf life: 1 year, in the closed bag.
Health and safety
- Gypsum plaster is a fine powder. Do not breathe the dust: wear a dust mask when you open a bag and when you mix.
- Wear gloves and eye protection.
- If powder or wet plaster gets in the eyes, rinse them with clean water.
- Wet plaster becomes hot as it sets. Never let plaster set around a hand or another body part: it can burn.
- Wash your hands after work. Keep the bags away from children.
Read the safety data sheet of this product before you start.
Notes
The figures on this sheet come from the tests and the site measurements that are named beside them. Results on a site change with the surface, the workmanship and the weather. Make sure that the product is right for your work before you start. We can change this sheet without notice: ask us for the latest revision.
Made at Panvel
Email: [email protected]
Made at Panvel since 2021. Supplied ex-factory to any place. No minimum order.
TDS-SIG-MR · Revision 02 · 6 October 2026