Silicone Sealants - Sikasil® WS-290
Ultra low modulus, neutral cure silicone sealant
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
- Non-staining
- Joint movement +100/-50 %
- Excellent adhesion
- One-component
- Excellent gunnability in all temperatures
- Ultra low Modulus
Usage
- 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.
Advantages
- Unaffected by most atmospheric conditions
- Excellent resistance to UV and Ozone exposure
- Non-staining
- Joint movement +100/-50 %
- Excellent adhesion
- One-component
- Excellent gunnability in all temperatures
- Ultra low Modulus
Packaging
10.1 fl.oz. (.300 ml) plastic cartridges, 20 fl.oz. (.592 ml) sausages, 2 gal. pails (7.57 L)
Product Details
Product Information
Shelf Life12 months in original unopened cartridges.
Storage ConditionsStore in unopened containers at temperatures lower than 80 °F (27 °C).
Volatile organic compound (VOC) content29 g/l
Technical Information
Service Temperature-80 °F to 350 °F
Application
Application Information
Sag Flownone
Tack Free Time50 minutes
Tooling Time30 minutes, (higher temperatures and/or humidity will shorten this time)
Application Steps
SUBSTRATE PREPARATIONThe substrate must be clean, dry, frost free, sound and free of any oils, greases or incompatible sealers, paints or coatings that may interfere with adhesion.
POROUS SUBSTRATES - clean by mechanical methods to expose a sound surface free of contamination and laitance.
NON-POROUS SUBSTRATES - for cleaning non-porous substrates, use two rag wipe method using xylene or an approved commercial solvent. Allow solvent to evaporate prior to sealant application. Sikasil® WS-290 is designed to obtain adhesion without the use of a primer; however, certain substrates may require a primer. Test by applying the sealant and/or primer sealant combination to confirm results and proposed application methods. Refer to Technical Data Sheet for Sikasil Primer 2100 and contact Technical Service for additional information.
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