Sikasil WS-290 Silicone Building Sealant

Sikasil WS-290 is a one part natural curing silicone building sealant. Well suited for dynamic conditions due to its high adhesiveness and ultra-low modulus.

Product Description

  • One-part, neutral-curing, ultra low-modulus silicone sealant
  • Performs  well under dynamic conditions
    1. Strong adhesion
    2. Ultra-low modulus
    3. High extension/compression
  • 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-1 9.1 3-M87, AAMA 808.3


Sikasil® WS-290 silicone sealant is designed primarily for sealing expansion and control joints in precast concrete panels, architectural stones, metal curtainwalls, perimeter sealing of doors and windows, Exterior Insulation Finish Systems (EIFS) and numerous other areas requiring a high-performance sealant.

Characteristics and Advantages:

  • Accommodates long-term movement of +100-50% in properly designed joints
  • Neutral cure
  • Suited for use in Exterior Insulation Finish Systems (EIFS)

Sikasil WS-290 Silicone Building Sealant Product Data Sheet

Sikasil WS-290 Silicone Building Sealant SDS