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-19.13-M87.
- Ultra low modulus
- Unaffected by most atmospheric conditions
- Excellent resistance to UV and Ozone exposure
- Non-staining to most porous substrates
- Joint movement +100/-50 %
- Excellent adhesion to most substrates and surfaces
- One-component, moisture-curing
- Excellent gunnability in all temperatures
Usage
Sikasil® WS-290 silicone sealant has been specifically designed:- For 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
- Ultra low modulus
- Unaffected by most atmospheric conditions
- Excellent resistance to UV and Ozone exposure
- Non-staining to most porous substrates
- Joint movement +100/-50 %
- Excellent adhesion to most substrates and surfaces
- One-component, moisture-curing
- Excellent gunnability in all temperatures
Packaging
10 fl.oz. (295 ml) cartridge, 20 fl.oz. (600 ml) sausages, 2 gal. pails (7.6 L)
Product Details
APPROVALS / STANDARDS
- Meets the requirements of ASTM C920, Type S, Grade NS, Class 100/50, Use NT, M, G, A, O
- SWRI validated acc. to ASTM C719 (No. 623-SIK290)
- Tested acc. to ASTM C1248 for staining on porous substrates
- Federal specification TT-S-00230C, Type II, Class A
- Canadian Standard CAN/CGSB 19.13-M87
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Shelf Life
12 months in original unopened containers
Storage Conditions
Store in unopened containers at temperatures lower than 80 °F (27 °C).
Volatile organic compound (VOC) content
29 g/l
Shore A Hardness
| 12 | (7 days at 77 °F (25 °C), 50 % R.H.) (ASTM C-661) |
Tensile Strength
| 165 psi (1.14 MPa) | (7 days at 77 °F (25 °C), 50 % R.H.) (ASTM D-412) |
Tensile stress at specified elongation
| 42 psi (0.29 MPa) at 100 % | (7 days at 77 °F (25 °C), 50 % R.H.) (ASTM D-412) |
Movement Capability
| +100 % / -50 % | (7 days at 77 °F (25 °C), 50 % R.H.) (ASTM C-719) |
Adhesion in peel
| 20–40 pli | (7 days at 77 °F (25 °C), 50 % R.H.) (ASTM C-794) |
Service Temperature
-80 °F to +350 °F (-62 °C to +177 °C)
UV Exposure
| Excellent | (7 days at 77 °F (25 °C), 50 % R.H.) (weatherometer) |
Color
| Staining, Color Change | None |
|
Staining on Porous Substrates |
No staining |
Application
Sag Flow
none
Cure Time
| Tack Free Time | 50 min. |
| Cure Time | 7-14 days |
| Full Adhesion | 7-14 days |
Tack Free Time
50 minutes
Tooling Time
30 minutes, (higher temperatures and/or humidity will shorten this time)
Coverage
10 oz (295 ml) Cartridge: Yield in Linear feet
| Width/Depth | 1/4'' | 3/8'' | 1/2'' |
| 1/4'' | 24.1 | ||
| 3/8'' | 16.0 | 10.7 | |
| 1/2'' | 12.0 | 8.0 | 6.0 |
| 3/4'' | 8.0 | 5.3 | 4.0 |
| 1'' | 3.0 | ||
| 1.25'' | 2.4 | ||
| 1.5'' | 2.0 |
20 oz (600 ml) Sausage: Yield in Linear feet
| Width/Depth | 1/4'' | 3/8'' | 1/2'' |
| 1/4'' | 48.1 | ||
| 3/8'' | 32.1 | 21.4 | |
| 1/2'' | 24.1 | 16.0 | 12.0 |
| 3/4'' | 16.0 | 10.7 | 8.0 |
| 1'' | 6.0 | ||
| 1.25'' | 4.8 | ||
| 1.5'' | 4.0 |
1 gallon: Yield in Linear feet
| Width/Depth | 1/4'' | 3/8'' | 1/2'' |
| 1/4'' | 307.9 | ||
| 3/8'' | 205.3 | 136.8 | |
| 1/2'' | 153.9 | 102.6 | 77.0 |
| 3/4'' | 102.6 | 68.4 | 51.3 |
| 1'' | 38.5 | ||
| 1.25'' | 30.8 | ||
| 1.5'' | 25.7 |
SUBSTRATE PREPARATION
The 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.
Priming
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.