Technical Data Sheet Sikaflex -291 Multifunctional ...

1 Technical Data Sheet Sikaflex -291. Multifunctional adhesive sealant for marine applications Technical product data: Chemical base one-part polyurethane Colour Black, white, grey, brown Density (DIN 53479) (uncured) 1,25 kg/l approx. depending on colour Stability (non-sag properties) good Cure mechanism moisture-curing Tack-free time* 60 minutes approx. Rate of cure* 3 mm per 24 hrs. (see diagram). Shrinkage (DIN 52451) 5% approx. Shore A hardness (DIN 53505) 40 approx. Tensile strength (DIN 53504) 1,8 N/mm2. Elongation at break (DIN 53504) > 400%. Tear strength (DIN 53515) > 4 N/mm Glass transition temperature (DIN 53445) -45 C approx. Application temperature +10 C to +35 C. Service temperature (continuous) -40 C to +90 C. short term (up to 8 hrs.) 120 C. Specific resistivity (DIN 53482) 109 cm approx. Movement accomodation factor 10% of joint width Shelf life (stored below 25 C) 12 months * = at 23 C and 50% relative humidity Description: Product benefits: Cure mechanism: Sikaflex -291 is a non-sag one- one-part formulation Sikaflex -291 cures by reaction part polyurethane sealant specifi- elastic with atmospheric moisture.

2 At low cally developed for the marine low odour temperatures the water content of market, which cures on exposure resistant to ageing and weather- the air is lower and the curing re- to atmospheric moisture to form a ing action proceeds more slowly (see durable elastomer. Sikaflex -291 is non-corrosive diagram). manufactured in accordance with can be overpainted the ISO 9001/14001 quality assur- can be sanded ance system. bonds well to a wide variety of Layer thickness [mm]. substrates 10. electrically non-conductive 5. 23 C/50%rh 10 C/50%rh 0. 0 2 4 6 8 10. Time [days]. Areas of application: Application Removal: Sikaflex -291 is a multi-purpose Pierce the cartridge membrane Uncured Sikaflex -291 may be product for use in marine construc- and peel back completely. removed from tools and equipment tion. It is suitable for making elas- Place the unipac in the application with Sika Remover-208.

3 Once tic, vibration-resistant joint seals, gun and snip off the closure clip. cured, the material can only be and can also be used for the ad- Cut off the tip of the nozzle to suit removed mechanically. hesive bonding of teak deck and joint width and gun the sealant into Hands and exposed skin should be for a variety of interior and exterior the joint with a suitable hand- washed immediately using a suit- sealing applications . Sikaflex -291 operated or compressed-air gun, able industrial hand cleanser and bonds extremely well to the mate- taking care to avoid air entrap- water. Do not use solvents! rials commonly used in marine ment. construction. Suitable substrates Once opened, packs should be Further information: include wood, metals, metal prim- used up within a few days. Copies of the following publica- ers and paint coatings (two-part tions are available on request: systems), ceramic materials and Do not apply at temperatures be- Sikaflex Marine Products - plastics (GRP, etc.)

4 Sikaflex -291 low 10 C or above 35 C. The op- Instructions for Use must not be used to seal plastics timum temperature for substrate Sika Primer Table for Marine that are prone to stress cracking and sealant is between 15 C and applications ( Perspex, polycarbonate, etc.). 25 C. Safety Data Sheet Once cured, Sikaflex -291 can easily be sanded down as re- For advice on selecting and setting Note: quired. up a suitable pump system, as well The information, and, in particular, the rec- as on the techniques of pump- ommendations relating to the application Chemical resistance: operated application, please con- and end-use of Sika products, are given in tact our System Engineering De- good faith based on Sika's current knowl- Sikaflex -291 is resistant to fresh edge and experience of the products when water, seawater, limewater, sew- partment properly stored, handled and applied under age effluent and aqueous deter- normal conditions.

5 In practice, the differ- gent solutions; temporarily resis- For information and advice on the ences in materials, substrates and actual tant to fuels, mineral oils, vegeta- safe handling, storage and dis- site conditions are such that no warranty in posal of chemical products, users respect of merchantability or of fitness for a ble and animal fats and oils; not particular purpose, nor any liability arising resistant to organic acids, alcohol, should refer to the current safety out of any legal relationship whatsoever, concentrated mineral acids and data Sheet containing physical, can be inferred either from this information, caustic solutions or solvents. ecological, toxicological and other or from any written recommendations, or The above information is offered safety-related data for this type of from any other advice offered. The proprie- product.

6 Tary rights of third parties must be observed. for general guidance only. Advice All orders are accepted subject to our cur- on specific applications will be rent terms of sale and delivery. Users given on request. Tooling and finishing. Tooling and should always refer to the most recent is- finishing must be carried out within sue of the Technical Data Sheet for the Method of application: the tack-free time of the sealant . product concerned, copies of which will be We recommend the use of Sika - supplied on request. Surface preparation Tooling Agent N. Other finishing The faces of the joint must be agents or lubricants must be tested clean, dry and free from all traces for suitability / compatibility. of grease, oil, wax and dust. The adhesion of the sealant can be im- Overpainting. Sikaflex -291 can be proved by wiping the joint with overpainted when tack-free.

7 The Sika Cleaner (cleaning and acti- paint must be tested for compatibil- vating agent) and applying the ap- ity by carrying out preliminary tri- propriate Sika Primer. als. Baked enamels should not be Directions for the preparation and applied to Sikaflex -291 until the treatment of different substrates sealant has attained full cure. are given in the Sika Primer Table It should be understood that the for Marine applications . hardness and film thickness of the paint may impair the elasticity of the sealant and lead to cracking. Please consult our Technical Sales Department for further information SIKA LIMITED. Watchmead, Welwyn Garden City, Hertfordshire, AL7 1BQ. Tel: 01707 394444 Email: Fax: 01707 329129 Web Site.