Multifunctional adhesive sealant for marine applications
Sikaflex®-291 is a non-sag, 1-component polyurethane sealant specifically developed for the marine market, which cures on exposure to atmospheric moisture. Sikaflex®-291 meets the requirements set out by the International Maritime Organisation (IMO).
BENEFITS
Bonds well to a wide variety of substrates
Good ageing and weathering resistance
Elastic
Low odour
Can be over painted
Can be sanded
INSTALLATION
Cure mechanism
Moisture-curing
Application temperature
5 ─ 40 °C
Skin time (CQP019-1)
60 minutes A
OVERPAINTING
Sikaflex®-291 can be best painted after formation of a skin. Painting could be improved by treating the joint surface with Sika® Aktivator-100 or Sika® Aktivator-205 prior to paint process. If the paint requires a baking process (> 80 °C), best performance is achieved by allowing the sealant to fully cure first. All paints have to be tested by carrying preliminary trials under manufacturing conditions.
TECHNICAL
Shore A hardness 40
(CQP023-1 / ISO 48-4)
Tear propagation resistance 6.5 N/mm approx.
(CQP045-1 / ISO 34)
Elastic recovery 90% approx.
(ISO 7389)
Service temperature (CQP513-1)
-50 ─ 90 °C
4 hours 160 °C 1 hour 180 °C
(CQP513-1)
PREPERATION
Surfaces must be clean, dry and free from grease, oil and dust.
Surface treatment depends on the specific nature of the substrates and is crucial for a long lasting bond. Suggestions for surface preparation may be found on the current edition of the appropriate Sika Pre-treatment Chart for Marine Applications. Consider that these suggestions are based on experience and must be verified by tests on original substrates.
APPLICATION
Sikaflex®-291 can be processed between 5 °C and 40 °C but changes in reactivity and application properties have to be considered. The optimum temperature for substrate and sealant is between 15 °C and 25 °C.Sikaflex®-291 can be processed with hand, pneumatic or electric driven piston guns as well as pump equipment. For advice on selecting and setting up a suitable pump system, contact the System Engineering Department of Sika Industry.
CLEANING OF EQUIPMENT
Uncured Sikaflex®-291 can be removed from tools and equipment with Sika® Remover-208 or another suitable solvent. Once cured, the material can only be removed mechanically.
Hands and exposed skin have to be washed immediately using Sika® Cleaner-350H cleaning towels or a suitable industrial hand cleaner and water. Do not use solvents on skin!
