Sikaflex 221 One-Component Multi-Purpose Industrial Grade Polyurethane Adhesive Sealant White


Sikaflex 221 Multi-Purpose Industrial Grade Polyurethane Adhesive Sealant

In stock


300mL Sikaflex-221 Multi-purpose Weather-resistant Strong Industrial Grade Polyurethane White Adhesive and Sealant

Sikaflex®-221 is a high-quality, multi-purpose, non-sag one-component polyurethane sealant that cures on exposure to atmospheric humidity to form a durable elastomer.

Sikaflex 221 shows a wide spectrum of adhesive and is suitable for an elastic, durable, strong seal.


  • Bonds well to a wide variety of substrates: wood, metals, metal primers, paint coatings, ceramic materials and plastics
  • Elastic
  • Resistant to ageing and weathering exposure. 
  • Low odour, electrically non-conductive and non-corrosive
  • Can be painted over, can be sanded.
  • Food-safe approved
  • Elastic
  • Silicone-free

Additional information

Chemical Base

One-component polyurethane



Cure Mechanism


Density (uncured)

approx. 1.3 kg/L

VOC (EPA method 24)

48.3 g/L

Non-Sag Properties


Application Temperature (product)

5°C to 40°C

Tack-Free Time

60 minutes

Open Time

45 minutes



Shore A Hardness (ASTM D 2240)


Tensile Strength (ASTM D 412)

1.8 MPa approx

Elongation at Break (ASTM D 412)


Tear Propagation Resistance (ASTM D 624)

7 N/mm approx

Glass Transition Temperature


Service Temperature

Permanent: -40°C to 90°C 1 day: 120°C 1 hour: 140°C

Shelf Life (Storage below 25C)

12 months – cartridges & sausages 6 months – drums & pails