DOWSIL™ 718 Sealant
Features &Benefits
• Ease of application. Ready to use as supplied; one-component, moisture cure, no need for mixing.
• Excellent weatherability, offering resistance to sunlight, rainwater, snow, ozone or extreme temperatures.
• Reasonable durability; the cured sealant can maintain its elasticity in temperatures of -50°C to 150°C without hardening, cracking or degrading.
• Translucent vision.
• Meet GB/T 14683 and JC/T 882
• ± 25 movement capability
Applications
DOWSIL™ 718 Sealant is a one-component, neutral curing construction sealant which can provide a long-term, elastic, water-proof rubber seal mostly apply for spider bolt system and glass butt joint applications.
How to Use
Here are some general guidelines on how to use DOWSIL™ 718 Multi-Purpose Sealant:
Surface cleaning:The surface of the substrate should be sufficiently clean, dry, flat and free of foreign matter. Completely remove any existing sealant. For the selection of solvent, please refer to the adhesion test report.
Use of primer: Consult the adhesion test report to determine if the use of a DOWSIL primer is recommended. The adhesion test report can be requested from the Dow Chemical Company.
Backing material: At the bottom of the joint, use backer rod (e.g. closed-cell type polyethylene or open-cell polyurethane foams) or equivalent material (e.g. low-viscosity polyethylene tape) to control the depth of sealant. Avoid 3-sided adhesion by preventing the sealant from adhering to the bottom of the joint.
Masking and Tooling: Masking tape can be used in the area adjacent to the joint to ensure a neat sealant line, preventing the surrounding surplus sealant from contaminating the substrate surface.
Sealant filling: Apply sealant to the bottom of the joint to fill the joint completely and to ensure adhesion to both sides of the joint. Do not apply the sealant simply on the surface as the sealant cannot fully fill the joint by gravity.
Usable Life and Storage
When stored below 30°C in the original unopened containers, this product has a usable life of 12 months from the date of production.
Limitations
This product is neither tested nor represented as suitable for medical or pharmaceutical uses.
