Sikasil WS-290 FPS Silicone Building Sealant

Sikasil WS-290 FPS is a one-component field pigmentable silicone building sealant. Color packs are sold separately and custom colors are available. It is non-sag, neutral cure silicone sealant. Used for sealing expansion and control joints in precast concrete panels and metal curtain walls, weathersealing glass to glass butt joints, weathersealing nonstructural glazing, and sealing EIFS.

Product Description

Sikasil WS-290 FPS is a field pigmentable, low to no bleed, low modulus, one–component plus color pack, non-sag, elastomeric, neutral cure silicone sealant.

Sikasil WS-290 FPS performs exceptionally well under dynamic conditions due to its ultra-low modulus of elasticity, high extension/compression, recovery properties and strong adhesion to most building materials. Sikasil WS-290 FPS accommodates long-term joint movement of +100-50% in properly designed joints and is particularly well suited for use in Exterior Insulation Finish Systems (EIFS).

Meets the requirements of ASTM C-920, Type S, Grade NS, Class 100/50, Use NT, M, G, A, O; TT-S-00230C, Type II, Class A; TT-S-001543A, Class A; CAN/CGSB-19-.13-M87, AAMA 808.3.
Where to Use

  • Sealing expansion and control joints in precast concrete panels and metal curtain walls.
  • As a weatherseal in glass to glass butt joint glazing
  • As a weatherseal in nonstructural glazing applications, including cap, toe and heel beads
  • Exterior Insulation Finish Systems (EIFS) and numerous other areas requiring a high-performance


  • Field pigmentable sealant
  • Unaffected by most atmospheric conditions
  • Non-staining
  • Joint movement +100/-50%
  • Excellent adhesion
  • One-component, plus color pack
  • Excellent gunnability

Colors: White, Colonial White, Aluminum, Limestone, Black, Bronze, Medium Bronze. Custom colors available on request.

Sikasil WS-290 FPS silicone building sealant Product Data Sheet

Sikasil WS-290 FPS SDS