What is SIKASIL WS-605 S and why choose it
SIKASIL WS-605 S by Sika is a high-performance, one-component silicone sealant designed for waterproofing and sealing joints with high movement demands. It cures by reaction with atmospheric moisture using a neutral curing system, providing durable sealing with excellent adhesion on a wide range of substrates such as glass, metals, coated metals, plastics and wood. It offers outstanding resistance to UV radiation and weathering and is suitable for demanding façade and glazing applications.
The product is manufactured under ISO 9001 quality management and a Responsible Care safety program, ensuring consistent performance and controlled production.
Main features
- One-component silicone sealant with neutral curing mechanism.
- High movement capability: ±50 % (ASTM C 719).
- Excellent adhesion to glass, metals, painted and coated metals, plastics and wood.
- Outstanding UV and weather resistance for long-term outdoor use.
- Does not stain areas adjacent to the joint.
- Suitable for waterproofing and sealing under severe service conditions.
- Specifically suited for structural glazing, curtain walls and window applications.
- Meets requirements of ISO 11600 25 LM F & G, ASTM C 920 (class 50), ASTM C 1248, TT-S00230C, TT-S001543A, DIN 18540 and DIN 18545 (group E).
- Service temperature range from approximately -40 °C to +150 °C.
- Supplied in 300 ml cartridges and 600 ml unipac.
Technical specifications
- Chemical base: One-component silicone.
- Colour: See product overview.
- Curing mechanism: Moisture curing.
- Curing type: Neutral.
- Density (uncured) (CQP 006-4):
- Transparent: approx. 1.03 kg/l.
- Other colours: approx. 1.49 kg/l.
- Sag (CQP 061-4 / ISO 7390): approx. < 2 mm.
- Application temperature: 5 °C to 40 °C.
- Skin formation time (CQP 019-2): approx. 25 minutes.
- Tack-free time (CQP 019-1): approx. 120 minutes.
- Curing rate (CQP 049-1): See diagram 1.
- Shore A hardness (CQP 023-1 / ISO 868): approx. 20.
- Tensile strength (CQP 036-1 / ISO 37): approx. 1.0 N/mm².
- Elongation at break (CQP 036-1 / ISO 37): approx. 800 %.
- Tear resistance (CQP 045-1 / ISO 34): approx. 4.0 N/mm.
- Modulus of elasticity (CQP 036-1 / ISO 37): approx. 0.3 N/mm².
- Movement capability (ASTM C 719): ±50 %.
- Thermal resistance (CQP 513-1):
- Continuous: approx. 180 °C.
- Up to 4 hours: approx. 200 °C.
- Up to 1 hour: approx. 220 °C.
- Service temperature: approx. -40 °C to +150 °C.
- Shelf life (CQP 016-1): 12 months when stored below 25 °C.
- Compatibility: Generally compatible with most high-quality Sika silicone adhesives and sealants from the Sikasil WS, FS, SG, IG, WT and AS ranges, and with SikaGlaze IG. Compatibility of other sealants and accessory materials must be checked beforehand.
- Paintability: Not paintable.
- Packaging types: 300 ml cartridge, 600 ml unipac.
Applications and uses
SIKASIL WS-605 S is intended exclusively for use by experienced professional users.
Recommended areas of application
- Waterproofing and sealing applications where high durability is required under severe conditions.
- Sealant for structural glazing.
- Sealant for curtain wall façades.
- Sealant for window construction.
Substrate compatibility and limitations
- Good adhesion to glass, metals, painted and coated metals, plastics and wood.
- Do not use on pre-stressed polymethyl methacrylate (PMMA) or polycarbonate elements that may fail by stress cracking.
- The compatibility of washers, hollow spacers, setting blocks and other accessory materials with SIKASIL WS-605 S must be checked in advance.
- Joints deeper than 15 mm should be avoided.
- When different sealants are used in the same joint, the first one must be fully cured before applying the next.
Guidelines for joint design and application
- Joints must be correctly dimensioned because modifications are not possible after construction.
- For optimum performance, joint width should be designed according to the sealant movement capability and the expected joint movement.
- Minimum joint depth: 6 mm.
- Recommended width-to-depth ratio: 2:1.
- Use closed-cell, compatible foam backer rods (for example, high-resilience polyethylene foam rods) to fill the joint where possible.
- For shallow joints where backer rod cannot be used, a polyethylene tape is recommended as a non-adhering backing to allow joint movement and silicone expansion.
Curing behaviour
- Cures by reaction with atmospheric moisture, starting at the surface and progressing towards the centre of the joint.
- Curing speed depends on relative humidity and temperature.
- At low temperatures, the moisture content in the air is lower and curing is slower.
- Do not heat above 50 °C to accelerate curing, as this may cause bubble formation.
Surface preparation and application method
- Substrates must be clean, dry and free of grease, oil and dust.
- Specific advice on surface pre-treatment is available from Sika Industry Technical Department.
- After proper preparation of substrates and joints, apply SIKASIL WS-605 S into the joint.
- Tooling and finishing must be performed within the skin formation time.
- When tooling fresh sealant, press it firmly against the joint flanks to ensure good wetting.
Cleaning
- Uncured SIKASIL WS-605 S can be removed from tools and equipment with Sika Remover-208 or another compatible solvent.
- Once cured, the material can only be removed mechanically.
- Hands and exposed skin should be washed immediately with Sika Handclean Towel or a suitable industrial hand cleaner and water.
- Do not use solvents for cleaning skin.
FAQ
1. What type of sealant is SIKASIL WS-605 S?
It is a one-component, neutral-curing silicone sealant that cures with atmospheric moisture and is designed for high-performance waterproofing and sealing applications.
2. On which substrates can SIKASIL WS-605 S be used?
It adheres well to glass, metals, painted and coated metals, plastics and wood. Tests should be carried out on the original substrates and conditions to ensure adhesion and material compatibility.
3. Can SIKASIL WS-605 S be painted?
No. SIKASIL WS-605 S cannot be painted.
4. What movement capability does this sealant offer?
It has a movement capability of ±50 % according to ASTM C 719.
5. What is the recommended joint design?
The minimum joint depth is 6 mm and the recommended width-to-depth ratio is 2:1. Joints deeper than 15 mm should be avoided.
6. What is the service temperature range of SIKASIL WS-605 S?
The approximate service temperature range is from -40 °C to +150 °C.
7. How long does SIKASIL WS-605 S take to form a skin and become tack-free?
Skin formation time is approximately 25 minutes and tack-free time is approximately 120 minutes (depending on temperature and humidity).
8. Can it be used together with other Sika silicone sealants?
Most high-quality Sika silicone adhesives and sealants from the Sikasil WS, FS, SG, IG, WT and AS ranges are compatible with SIKASIL WS-605 S and with SikaGlaze IG. When using different sealants, the first one must be fully cured before applying the next.
9. Are there substrates where SIKASIL WS-605 S should not be used?
It should not be used on pre-stressed polymethyl methacrylate (PMMA) or polycarbonate elements that are susceptible to stress cracking.
10. What is the shelf life of SIKASIL WS-605 S?
When stored below 25 °C, the product has a shelf life of 12 months.
Section 14 – Transport information
Consultar ficha técnica del fabricante.
Section 8 – Individual protection measures
Consultar ficha técnica del fabricante.
*Contenido generado por IA
