Sikasil® WS-295
STRUCTURAL GLAZING/WEATHER SEALING GRADE, NEUTRAL-CURE AND NO-BLEED SILICONE SEALANT
Sikasil® WS-295 is a versatile, one-component, non-sag, elastomeric, neutral-cure silicone sealant. It possesses a no-bleed formulation and is suitable for above grade, horizontal and vertical, interior or exterior applications, including structural glazing and weather sealing.
- Structural glazing and weather sealing applications with one product
- May be applied in below freezing temperatures if substrates are completely dry, frost-free and clean.
- Excellent gunability in all temperatures.
- Adhesion to porous and non-porous materials, including glass, aluminium, metal, tile, fibreglass, plastic, ceramic, masonry, concrete, brick, powder coated aluminium, fluoropolymer painted surfaces, vinyl, PVC, granite, limestone, marble and wood
- Capable of accommodating ± 50 % joint movement
- Non-staining, maintains appearance of architectural substrates.
- Unaffected by most atmospheric conditions.
- Meets industry specifications: ASTM C920, Type S, Grade NS, Class 50/50, Use NT, M, G, A, O; ASTM C1184 Structural Silicone Sealant; TT-S-00230C, Type II, Class A; CAN/CGSB 19.13-M87, AAMA 802.3 Type II, AAMA 803.3, AAMA 805.2, AAMA 808.3 and California Air Resources Board 2003 requirements for VOC content.
Usage
- Structural glazing*
- Conventional glazing
- Perimeter sealing of windows, doors and skylights
- Unitized curtain wall assembly and field installation
- Panel stiffeners
- Precast expansion joints
- Weather sealing of most common building materials
Advantages
- Structural glazing and weather sealing applications with one product
- May be applied in below freezing temperatures if substrates are completely dry, frost-free and clean.
- Excellent gunability in all temperatures.
- Adhesion to porous and non-porous materials, including glass, aluminium, metal, tile, fibreglass, plastic, ceramic, masonry, concrete, brick, powder coated aluminium, fluoropolymer painted surfaces, vinyl, PVC, granite, limestone, marble and wood
- Capable of accommodating ± 50 % joint movement
- Non-staining, maintains appearance of architectural substrates.
- Unaffected by most atmospheric conditions.
- Meets industry specifications: ASTM C920, Type S, Grade NS, Class 50/50, Use NT, M, G, A, O; ASTM C1184 Structural Silicone Sealant; TT-S-00230C, Type II, Class A; CAN/CGSB 19.13-M87, AAMA 802.3 Type II, AAMA 803.3, AAMA 805.2, AAMA 808.3 and California Air Resources Board 2003 requirements for VOC content.
Packaging
295 mL (10.1 US fl. oz) cartridge, 24/case
600 mL ( 20 US fl. oz) sausage, 20/case
Colour
Aluminum, Black, Bronze, Colonial White, Limestone, Medium Bronze, White.
Product Details
Shelf Life
12 months in original unopened containers
Storage Conditions
Store at or below +32 °C (90 °F).
Shore A Hardness
| 20 | (21 days at 25 °C (77 °F) (50 % R.H.) (ASTM C661) |
Tensile Strength
| 1.59 MPa (230 psi) | (21 days at 25 °C (77 °F) 50 % R.H.) (ASTM D412) |
Adhesion in Peel
| 30 pli on aluminium, glass and concrete | (7 days at +25 °C (77 °F) 50 % R.H.) (ASTM C794) |
Movement Capability
| +/-50 % | (21 days at +25 °C (77 °F) and 50 % R.H.) (ASTM C719) |
Service Temperature
-62.2 °C to +176 °C (-80 °F to 350 °F)
Application
Extrusion Rate
| 150 | Extrusion Rate g/min ASTM C1183 mod. 3 mm (1/8 in) orifice @ 0.6 MPa (90 psi) |
Sag Flow
| no sag | ( +25 °C (77 °F) 50 % R.H.) (ASTM C639) |
Substrate Temperature
Sealant may be applied in below freezing temperatures, but surfaces must be dry, frost-free and clean. Sealant should be installed when the joint is at mid-range of its anticipated movement.
Curing Rate
| 3 mm (1/8 in) / 24 h |
Skinning time
25 minutes
Tack-free time
| 50 minutes | (ASTM C679) |
Yield
| Linear meters per litre | Linear feet per cartridge | ||
| Width | Depth | Depth | |
| mm (in) | 6 (1/4) 13 (1/2) | 6 (1/4) 13 (1/2) | |
| 6 (1/4) | 24.8 | 24 | |
| 13 (1/2) | 12.4 6.2 | 12 6 | |
| 19 (3/4) | 8.3 4.1 | 8 4 |
SUBSTRATE PREPARATION
All joint surfaces must be clean, sound, dry, and frost free. Joint walls must be free of oils, asphalt, tar, bituminous materials, grease, paints, coatings or sealers. Curing compounds, release agent residues, glazing compounds, and any other foreign matter must be removed.
Porous substrates should be cleaned by mechanical methods, such as grinding, saw cutting, blast cleaning (sand or water), or wire brushing. Dust, loose particles, etc. should be blown out of joints with oil-free compressed air or vacuum cleaned to remove all material which may interfere with adhesion.
Non-porous substrates should be cleaned by using a solvent wipe method, applied by lint free and clean rags and allow the solvent to evaporate before installing the sealant. Xylene or an approved commercial solvent can be used, ensuring the solvent manufacturer’s instructions are strictly followed. Soap or detergent and water cleaning treatments are not recommended. Cleaning of all surfaces should be done just prior to the sealant application.
Apply Sikasil® WS-295 only to suitably prepared and cleaned substrates. Long term adhesion and performance is dependant upon such.
Priming
Sikasil® WS-295 is designed to obtain adhesion without the use of a primer, however, certain substrates may require a primer. A field test is recommended to determine the adhesion of the sealant and/or primer and sealant combination, to confirm results and the suitability of the proposed application. Consult Sikasil® Primer Data Sheets or contact Sika Canada for additional information on priming.
NOTE: Priming is never a substitute for proper surface cleaning and preparation.
CLEAN UP
Clean all tools and equipment and remove excess sealant from substrates, all while the material is uncured, using a commercial solvent, such as xylene. Strictly follow the manufacturer’s instructions for use and warnings. Once hardened, product can only be removed mechanically.
