Sikaflex 221

Sikaflex 221
Sikaflex 221
  • Universal 1-C adhesive sealant
  • Resistant to ageing
  • Contents: 300 ml

Sikaflex 221 is a multi-purpose polyurethane adhesive and sealant. Sika's 1-component PU adhesive bonds well to a wide variety of substrates, such as metals, metal primers and paint coatings (2-component systems), ceramic materials and plastics. Universal Sikaflex 221 is suitable for making permanent elastic seals.

Benefits Sikaflex 221

  • Bonds well to a wide variety of substrates.
  • Resistant to ageing.
  • Can be sanded and painted.
  • Passes EN45545-2 R1/R7 HL3.
  • Non-corrosive.
  • Low odor.


We recommend applying Sikaflex 221 to a clean and dry surface, free from all traces of grease, oil and dust. Surface preparation depends on the specific nature of the substrate and is crucial for a long lasting bond. Sikaflex 221 sealant can be applied 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 221 can be processed with a hand, pneumatic or electric driven piston gun as well as pump equipment.



Contents: 300 ml sealant tube
Chemical base: 1-component polyurethane
Colour: white, grey, black and beige
Cure mechanism: moisture-curing
Density (uncured): 1.3 kg/l
Viscosity: good
Application temperature: 5 - 40 °C
Skin time: 60 minutes (23°C / 50% r.l.)
Open time: 45 minutes (23°C / 50% r.l.)
Shrinkage: 5 %
Hardness: shore A 40
Tensile strength: 1.8 MPa
Elongation at break: 500 %
Tear propagation resistance: 7 N/mm
Shelf life: 12 months (storage below 25°C)

We have a number of recommendations for working safely with polymers. At Polyestershoppen you will not only find the polymers themselves, but you can also purchase all the protective equipment you need from us. If you have any doubts or questions, please contact our customer service. We can give you advice on how to work safely with polymers.

Safety equipment


Code Description
H334 May cause allergy or asthma symptoms or breathing difficulties if inhaled.
H373 May cause damage to organs <or state all organs affected, if known> through prolonged or repeated exposure <state route of exposure if it is conclusively proven that no other routes of exposure cause the hazard>.
P260 Do not breathe dust/fume/gas/mist/vapours/spray.
P284 [In case of inadequate ventilation] wear respiratory protection.
P304+P340 IF INHALED: Remove person to fresh air and keep comfortable for breathing.
P342+P311 If experiencing respiratory symptoms: Call a POISON CENTER/doctor/…
P501B Dispose of contents/container in accordance with in accordance with local regulation
EUH205 Contains epoxy constituents. May produce an allergic reaction.
MDI As from 24 August 2023 adequate training is required before industrial or professional use

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