Sikasil® WS-290 is a one-part, neutral-curing, ultra low-modulus, low to no bleed silicone sealant that cures to a durable, flexible building sealant Sikasil® WS-290 performs exceptionally well under dynamic conditions due to its ultra-low modulus, high extension/compression, recovery properties and strong adhesion to most building materials. Sikasil® WS-290 accommodates long-term 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-1 9.1 3-M87, AAMA 808.3
Unaffected by most atmospheric conditions
Excellent resistance to UV and Ozone exposure
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 sealant.