DOWSIL™ 688 Glazing and Cladding Sealant

DOWSIL™ 688 Glazing and Cladding Sealant is a one-part neutral cure, construction grade sealant that easily extrudes in any weather. It quickly cures at room temperature by reacting with moisture in the air to form a durable, flexible silicone rubber seal. It has excellent unprimed adhesion to most construction materials.

• Excellent resistance to weathering, ultra-violet radiation, vibration, moisture, ozone, temperature extremes, airborne pollutants, cleaning detergents and many solvents
• Long life reliability
• Strong elastic seal capable of withstanding movements up to ± 25% of the original joint width
• Non-slumping; can be used in vertical and overhead joints
• Excellent recovery from extension and compression

Packaging: 300 ml disposable plastic cartridges

Colour Options: Black and Transparent

Applications:

DOWSIL™ 688 Glazing and Cladding Sealant is a one-part neutral cure silicone sealant designed for a wide range of glazing, weather sealing and professional caulking applications. It will bond to form a strong weatherproof seal on most common building materials.

Limitations: This product is neither tested nor represented as suitable for medical or pharmaceutical uses. DOWSIL™ 688 Glazing and Cladding Sealant is not recommended for use in continuous water immersion, nor for below ground or other joints where excessive abrasion and physical abuse are encountered.

It should not be applied:

• To build materials that bleed oils, plasticizers, or solvents – materials such as impregnated wood, oil-based caulks and certain green or partially vulcanized rubber gaskets and tapes.
• To copper or copper-containing building materials.
• To surfaces in direct contact with food. This sealant has not been tested to determine its status under Federal Food and Drug Administration regulations.
• To uncured sealant other than DOWSIL™ 688 Glazing and Cladding Sealant. Sealants with different cure chemistry, such as one-part structural sealants, should be fully cured before DOWSIL™ 688 Glazing and Cladding Sealant is applied.

How to use:

1. Preparation

Clean all joints, removing all foreign matter and contaminants such as grease, oil, dust, water, frost, surface dirt, old sealants or glazing compounds and protective coatings.

2. Application Method

Install backing material or joint filler, setting blocks, spacer shims and tapes. Mask areas adjacent to joints to ensure neat sealant lines. Primer is generally not required on nonporous surfaces but may be necessary for optimal sealing of certain porous surfaces. A test placement is always recommended. Apply DOWSIL™ 795 Silicone Building Sealant in a continuous operation using positive pressure. (The sealant can be applied using many types of air-operated guns and most types of bulk dispensing equipment.) Before a skin forms (typically within 15 minutes), tool the sealant with light pressure to spread the sealant against the backing material and joint surfaces. Remove masking tape as soon as the bead is tooled.