Sikasil® WS-295
Neutral cure, weather sealing silicone sealant
Sikasil® WS-295 sealant is a one part, neutral cure for use in most common weatherproofing applications on a wide variety of materials. Meets the requirements of ASTM C920, Type S, Grade NS, Class 50, Use NT, M, G, A, O; TT-S-00230C, Type II, Class A; CAN/CGSB-19.13-M87
- Versatile medium modulus
- Unaffected by most atmospheric conditions
- Excellent resistance to UV and Ozone exposure
- Non-staining to most porous substrates
- Joint movement ±50 %
- Excellent adhesion to most substrates and surfaces
- One-component, moisture-curing
- Excellent gunnability in all temperatures
Usage
Sikasil® WS-295 silicone sealant has been specifically designed:- As a weatherseal in conventional glazing, including cap, toe and heel beads.
- As a weatherseal in glass to glass butt joint glazing.
- Sealing expansion and control joints in precast concrete panels and metal curtain walls.
- Perimeter weathersealing of doors, windows and other building components.
- Adhering stiffeners to building panels.
- Excellent for use in unitized curtain wall systems.
Advantages
- Versatile medium modulus
- Unaffected by most atmospheric conditions
- Excellent resistance to UV and Ozone exposure
- Non-staining to most porous substrates
- Joint movement ±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) sausage, 2 gal. pails (7.6 L)
Color
White, Colonial White, Aluminum, Limestone, Black, Bronze, Medium Bronze, Custom
Product Details
APPROVALS / STANDARDS
- Meets the requirements of ASTM C920, Type S, Grade NS, Class 50, Use NT, M, G, A
- SWRI validated acc. to ASTM C719 (No. 123-SIK295)
- Tested acc. to ASTM C1248 for staining on porous substrates
- Meets the requirements of ASTM C1184
- 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
| 37 g/L |
Shore A Hardness
| 25 | (7 days at 77 °F (25 °C) 50 % R.H.) (ASTM C-661) |
Tensile Strength
| 200 psi (1.38 MPa) | (7 days at 77 °F (25 °C) 50 % R.H.) (ASTM D-412) |
Tensile stress at specified elongation
| 55 psi (0.38 MPa) at 100 % | (7 days at 77 °F (25 °C) 50 % R.H.) (ASTM D-412) |
Movement Capability
| +/-50 % | (7 days at 77 °F (25 °C) 50 % R.H. at 100 %) (ASTM C-719) |
Adhesion in peel
| 30 pli on aluminium, glass and concrete | (7 days at 77 °F (25 °C) 50 % R.H.) (ASTM C-794) |
Service Temperature
-80–350 °F (-62–177 °C)
UV Exposure
| Excellent | Ozone/UV Resistance (ASTM D-1149) |
Color
| Staining, Color Change | None |
| Staining on Porous Substrates | No staining |
Application
Sag Flow
| no sag | (77 °F (25 °C) 50 % R.H.) (ASTM C-639) |
Cure Time
| Tack Free Time | 50 min. |
| Cure Time | 7-14 days |
| Full Adhesion | 7-14 days |
Tooling Time
| Initial Skin: 20–30 minutes | (77 °F (25 °C) 50 % R.H.) |
Coverage
10.0 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 |
2 gallon (7.6 L) Pail: Yield in Linear feet
| Width/Depth | 1/4'' | 3/8'' | 1/2'' |
| 1/4'' | 615.8 | ||
| 3/8'' | 410.6 | 273.6 | |
| 1/2'' | 307.8 | 205.2 | 154.0 |
| 3/4'' | 205.2 | 136.8 | 102.6 |
| 1'' | 77.0 | ||
| 1/25'' | 61.6 | ||
| 1/5'' | 51.4 |
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-295 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 primers Sikasil® Primer-2100 and contact Technical Service for additional information.