Guangzhou Eric Wei Chemical Co., Ltd.
Guangzhou Eric Wei Chemical Co., Ltd.

Sika Sikaflex-221 Polyurethane Sealant AdhesiveSika

Sika Sikaflex-221 is a one-component polyurethane sealant adhesive from Sika’s premium Sikaflex range. It offers excellent adhesion to diverse substrates, high elasticity, weather resistance, and paintability. Ideal for bonding and sealing in construction, automotive, and industrial applications without priming on most surfaces.
  • sika sikaflex 221 polyurethane sealant adhesivesika_c3d98484
  • sika sikaflex 221 polyurethane sealant adhesivesika_c3d98484

Features Of Sika Sikaflex-221 Polyurethane Sealant AdhesiveSika

  1. One-component, moisture-curing polyurethane formulation requiring no mixing or priming on most substrates.

  2. Excellent adhesion to a wide range of construction materials including concrete, masonry, metal, glass, and painted surfaces.

  3. High elasticity with up to 25% joint movement capability (±12.5%), maintaining integrity under thermal and structural cycling.

  4. Good resistance to weathering, UV exposure, rain, and temperature extremes (–40 °C to +90 °C service range).

  5. Non-sag consistency suitable for vertical and overhead applications without slumping or sagging.

Typical Applications Of Sika Sikaflex-221 Polyurethane Sealant AdhesiveSika

  1. Sealing expansion and control joints in precast concrete façades and cladding systems.

  2. Bonding and sealing curtain wall perimeters, window and door perimeters, and glazing interfaces.

  3. Joint sealing in industrial flooring, cleanrooms, and food-processing facilities where hygiene and flexibility are critical.

  4. Repair and resealing of cracks and gaps in concrete structures, bridges, and parking decks.

  5. General-purpose sealing and bonding in transportation infrastructure, including bus and rail vehicle assembly.

Specifications Of Sika Sikaflex-221 Polyurethane Sealant AdhesiveSika

Chemical TypeOne-component moisture-curing polyurethane
Product FormPaste-like, non-sag sealant in sausage cartridges or pails
AppearanceHomogeneous paste; available in black, grey, white, and clear
Primary ApplicationsConstruction joint sealing, façade assembly, glazing, and structural bonding
Key FeaturesPrimerless adhesion, high movement capability, UV stable, paintable after curing
BenefitsReduced labor time, long-term durability, low VOC content, ISO 11600 compliant
Curing MechanismReaction with atmospheric moisture
Shelf Life12 months in unopened original packaging at ≤25 °C


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