Popular
Sikaflex-291i sealant
At a glance
- For interior and under water
- 1-component sealant
- For yacht and ship building
Fast delivery throughout Europe
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4.7 out of 5 stars on Trusted Shops
Product description
Multifunctional sealant for marine applications.
Sikaflex-291i is a multifunctional sealant for yacht and shipbuilding applications. This 1-component polyurethane sealant has been specially developed for creating elastic, vibration-resistant joint seals and is suitable for a wide range of sealing and bonding applications on board.
Sikaflex-291i cures through exposure to atmospheric moisture and has good non-sag properties. Thanks to its very low VOC content, low odour and low isocyanate content, the sealant is easy to work with. The product also complies with the low flame-spread requirements of the International Maritime Organization (IMO) and is Wheelmark-certified.
Benefits of Sikaflex-291i
- Wheelmark-certified for marine applications.
- Easy-to-apply 1-component formulation.
- Highly flexible and vibration-resistant.
- Good non-sag properties, even on vertical surfaces.
- Low odour.
- Non-corrosive.
- Paintable.
- Good adhesion to commonly used marine substrates.
- Solvent-free.
- Very low VOC content.
- Low isocyanate content.
Applications
Sikaflex-291i is a multifunctional sealant and adhesive for yacht and shipbuilding applications. The sealant is particularly suitable for sealing and bonding various components in both the interior and exterior of boats and ships and for creating flexible, vibration-resistant joint seals.
Thanks to its good adhesion to a variety of commonly used marine materials, Sikaflex-291i is suitable for a wide range of applications. The sealant adheres well to materials including:
- Wood.
- Metals.
- 2-component paint systems.
- Ceramic materials.
- Plastics, such as GRP.
For applications with prolonged exposure to UV radiation, Sikaflex-291i is less suitable due to its limited UV resistance. For exterior applications or areas exposed to high levels of UV radiation, Sikaflex-591 is a better choice.
Please note: Sikaflex-291i is not suitable for sealing plastics that are prone to stress cracking (e.g. PMMA and PC). Use Sikaflex-295 UV for these applications.
Specifications
Chemical base: 1-component polyurethane
Colour: white, grey, black, brown
Packaging: 300 ml (cartridge)
Curing mechanism: moisture curing
Sag resistance: good
Ambient application temperature: 10–40 °C
Skin formation time: 60 minutes
Open time: 45 minutes
Shrinkage: 2 %
Hardness (Shore A): 40
Tensile strength: 1.8 MPa
Elongation at break: 700 %
Temperature resistance: -50 to 90 °C
Shelf life: 12 months when stored below 25 °C
Suitable application gun: sealant gun for cartridges
Product properties
The key technical properties clearly listed in one place.
- Article number
- LIJ001001
-
The recommended application temperature range indicates the conditions under which the product can generally be applied and cured properly. Three temperatures matter:
- Air: the temperature in the workshop or outdoors.
- Substrate: the temperature of the surface being treated.
- Product: the temperature of the resin, adhesive or coating itself.
A cold substrate can cause condensation and affect adhesion. At higher temperatures, two-component products may react faster, reducing their working time. Check the dew point and follow the product instructions.
- 10-40 °C
-
The chemical base describes the chemistry of an adhesive, sealant, resin or coating, such as epoxy, polyester, polyurethane, (methyl)methacrylate or a hybrid polymer. It affects curing, flexibility and adhesion. Products with the same chemical base are not necessarily suitable for the same applications.
- One-component polyurethane (PU)
-
The period for which an unopened product remains usable under the specified storage conditions. Check whether the period starts from the manufacturing date or another date. Shelf life may be shorter after opening, especially for products sensitive to air or moisture.
- 12 months
-
The time after application during which a skin forms on the surface of a sealant. Tool the joint before the skin develops, as adjusting it afterwards can affect the finish or adhesion. Temperature and humidity influence this time.
- 1 hour
-
Cure shrinkage describes how much a resin, adhesive or rubber becomes smaller as it cures. The value is usually given as a percentage (%) and may refer to volume shrinkage or shrinkage along one dimension; these are not the same. Shrinkage matters for casting accuracy and for limiting stress or distortion.
- 2%
-
Open time is the period during which an applied adhesive, sealant or mortar can still be assembled, positioned or adjusted. It is usually given in minutes under specified conditions, often around 20 or 23 °C. Open time generally starts at application and may differ from the working time after mixing.
- 45 minutes
-
A solvent-free product contains no added solvents according to the manufacturer's specification. This does not automatically mean it is odourless, emission-free or safe to use without protective measures.
- Yes
-
Elongation at break indicates how much a material can stretch during a tensile test before it breaks. It is expressed as a percentage (%) of the original length. At 100% elongation, the material has doubled in length just before breaking. A high value indicates a high ability to deform, but not how much force is needed.
- 700%
-
Sag resistance describes how well a paste, sealant or coating stays in place after application without running or slumping. It matters on vertical surfaces, in thick adhesive joints and for overhead repairs.
A product may be thixotropic: it becomes easier to work when stirred or spread, then thickens again at rest. This makes application easier without the material immediately running down the surface. Sag resistance is not the same as viscosity; behaviour after application also matters.
- Good
-
Tensile strength is the maximum tensile stress a material can withstand during a tensile test before failure. It is usually expressed in MPa (megapascals) or N/mm² (newtons per square millimetre); 1 MPa = 1 N/mm². Under comparable test conditions, a higher value means greater resistance to tension. In composites, fibre orientation also affects the result.
- 1.8 MPa
-
The curing mechanism explains how a product develops its final strength or shape. The main mechanisms are:
- Two-component reaction (2K): a chemical reaction begins once components A and B are mixed. Mixing ratio and working time are important.
- Moisture curing (often 1K): the product reacts with moisture in the surrounding air. Temperature, humidity and film thickness affect the process.
- UV curing: light of the appropriate wavelength triggers the reaction. Areas that are not exposed to the light may not cure fully.
- Physical drying: water or solvent evaporates. This is different from chemical curing.
Some products use more than one mechanism, so the correct application conditions depend on the particular system.
- Moisture-curing
- Net contents
- 300 ml
-
Heat resistance describes the temperature a material can withstand after correct processing and curing, usually expressed in degrees Celsius (°C). Continuous exposure is different from a brief temperature peak, and mechanical loading may also affect the limit. Heat resistance is not the same as the temperature at which the product can be applied.
- -50 to 90 °C
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