Sika Sikaflex 221 is a high-quality multi-purpose non-sag, polyurethane sealant that cures on exposure to atmospheric humidity to form a durable elastomer.
– 1-C formulation
– Low odour
– Resistant to ageing
– Can be painted
– NSF-approved for incidental food contact.
It is temporarily resistant to fuels, mineral oils, vegetable and animal fats and oils. However, it is not immune to organic acids, alcohol, concentrated mineral acids and caustic solutions or solvents. Furthermore, any advice on specific applications will be given on request.
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Sikaflex 221 bonds well to a wide variety of substrates and is suitable for making strong, permanent, elastic seals. Suitable substrates are metals, metal primers and paint coatings, ceramics and plastics. Seek manufacturer’s advice and test on original substrates before using on surfaces that are prone to stress cracking.
Surfaces must be free from all traces of grease and dust.
Above all, if you need any advice on specific applications, then contact the Technical Service Department of Sika Industry.
The paint must be tested for compatibility by carrying out preliminary trials, and the best results are obtained if the sealant is allowed to cure thoroughly first, especially in the case of baked enamels. Therefore, please note that non-flexible paint systems may impair the elasticity of the adhesive, impair joint movement and lead to cracking of the paint film.
PVC based paints and paints that dry by oxidation (oil or alkyd resin-based) are generally not suitable for application over Sikaflex -221.
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