Sikaflex 291i 300ml white polyurethane sealant, flexible, vibration resistant, waterproof, glue for yachts and ships
Product code: 408836
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Product description
Sikaflex-291i white 300 ml is a one-component, non-sag polyurethane sealant engineered for marine applications. It cures with ambient moisture, complies with IMO standards and carries the Wheelmark, ensuring long-lasting flexibility, UV and weather resistance.
Benefits and Unique Features
- Wheelmark approved, IMO compliant
- One-component – ready to use
- Non-sag – stays in place on vertical surfaces
- High elongation (up to 700 %)
- Very low VOC, solvent-free
- Paintable after initial cure
Properties and Applications
- Chemical base: one-component polyurethane
- Color: white
- Density (uncured): 1.3 kg/l
- Curing mechanism: ambient moisture
- Application temperature: 10–40 °C
- Skin-over time: 60 min at 23 °C / 50 % RH
- Open time: 45 min at 23 °C / 50 % RH
- Shrinkage: 2 %
- Shore A hardness: 40
- Tensile strength: 1.8 MPa
- Elongation at break: 700 %
- Flame spread resistance: IMO compliant
- Applications: sealing and bonding marine structures – wood, metal, substrates, coatings, ceramics, GRP
Technical Specifications
| Parameter | Value |
|---|---|
| Cartridge volume | 300 ml |
| Chemical base | One-component polyurethane |
| Density | 1.3 kg/l |
| Skin-over time | 60 min (23 °C / 50 % RH) |
| Open time | 45 min (23 °C / 50 % RH) |
| Shrinkage | 2 % |
| Shore A hardness | 40 |
| Tensile strength | 1.8 MPa |
| Elongation at break | 700 % |
| Temperature range | –50 °C to +90 °C (24 h), briefly +120 / +140 °C |
| Shelf life | 12 months (stored < 25 °C) |
Storage Recommendations
Store in original, closed packaging in a dry place at +5 °C to +25 °C, protected from UV and frost.
Instructions for Use
- Prepare surfaces – clean, dry and free of grease and dust.
- Shake cartridge before use and load into a caulking gun.
- Apply at 10–40 °C, ideally 15–25 °C, avoiding air entrapment.
- Smooth joint before 60 min using Sika® Tooling Agent N.
- Remove uncured material with Sika Remover-208; cured material mechanically.
- Clean tools and skin with Sika Cleaner-350H and water; avoid solvents.
- Apply Sika Primer-290 or Primer-210 before painting, if required.
Product safety
Responsible person in the EU
Sika Poland Sp. z o.o.
Karczunkowska 89
02-871 Warszawa, Poland
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