MTA product system
MTA 991
Normal Cementitious Tile Adhesive
MTA 991 complies with the C1 classification requirements in accordance with EN 12004 standards.
Pack size25 kg / bag
ClassificationC1
ApplicationInterior + exterior
01Features & applications
- Suitable for installing ceramic wall and floor tiles and natural stone material which are not sensitive to discoloration or translucence.
- For conventional cement-based substrate, concrete render, brickwork, and cementitious screeds provided they are sufficiently dry and cured.
- Use on walls and floors in both interior and exterior applications.
- Where extra strength is required for dense tiles such as vitrified porcelain with water absorption ≤ 0.5%, marble, or granite, mix with MTA Admix 123.
02Limitations
- Do not use on wood.
- Do not use on metal, PVC, rubber, or linoleum surfaces.
- Do not use on surfaces subject to strong movement.
03Technical data
In compliance with EN 12004 under laboratory conditions.
| Property | Value |
|---|---|
| Appearance | White / grey powder |
| Specific gravity | 1.5 ± 0.1 kg / litre |
| Pot life at 25°C | 1–2 hours |
| Open time at 25°C | Approx. 20 minutes |
| Trafficable | After 24 hours |
| Tensile adhesion strength, 28 days | ≥ 0.5 N / mm² |
| Tensile adhesion after water immersion | ≥ 0.5 N / mm² |
| Tensile adhesion after heat ageing | ≥ 0.5 N / mm² |
| Open time | ≥ 0.5 N / mm² |
04Approximate coverage
Coverage may vary depending on the nature and flatness of the substrate.
| Property | Value |
|---|---|
| 3 × 3 mm notched trowel | 2.0–3.0 kg/m² |
| 6 × 3 mm notched trowel | 5.0–5.5 kg/m² |
| 12 × 12 mm notched trowel | 10.0–11.0 kg/m² |
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