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DOWSIL 789 Silicone Weatherproofing Sealant is a one-part, neutral- cure, architectural grade sealant. It easily extrudes in any weather and cures at ambient temperature by reaction with moisture in the air to form a durable, flexible silicone rubber seal.
Features & Benefits:
Easy of use - all temperature gunability
Primerless adhesion - upon curing will form a strong bond to most common building components without the use of a primer
Long-life reliability - cured sealant stays elastomeric from -50°C to 150°C without hardening, cracking or becoming brittle under normal weather conditions
Low Modulus - with extension/compression capability up to ±50% of original joint width
Excellent weatherability, virtually unaffected by sunlight, rain, snow, ozone
Ease of application - ready to use as supplied
One-part, neutral-cure, RTV silicone sealant
Adhesion to - Anodized Aluminum, Concrete, Enamelled and Reflective Glass, Fluorocarbon Coated Aluminum, Glass, Heat Strengthened Glass, Low E Coated Glass, Metal Panels, Polyester Powder Coated Aluminum/Steel, Stainless Steel
Appearance - Opaque, Translucent
Chemistry - Neutral
Color - Black, Bronze, Clear, Green (Catalyst), Grey, Ivory, White
Cure System - 1-Part Cure
Flow - NonSag
Movement - Medium
Substrate - Non-porous
Where Used - Job Site
Uncured - As Tested at 50% RH and 23°C (73°F)
Working Time : 15-30 minutes
Tack-free Time, 77°F, 50% RH : <80 minutes
Curing Time at 77°F (25°C) and 50% RH : 7-14 days
As Cured - After 21 days at 50% RH and 77°F (25°C)
Ultimate Tensile Strength : 16 kg/cm2
Ultimate Elongation : 700 %
Joint Movement Capability : ±50 %
Tear Strength, die B : 11 kg/cm
DOWSIL 789 Silicone Weatherproofing Sealant is a specified, premium performance weather sealing product specifically designed for general glazing and weather sealing in curtain wall and building facades.
How to Use:
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.
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 non-porous surfaces, but maybe necessary for optimal sealant of certain porous surfaces. A test placement is always recommended.
Apply DOWSIL 789 Silicone Weatherproofing Sealant in a continuous operation using a 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 15~20 minutes), tool the sealant with light pressure to spread the sealant against backing material and the joint surfaces. Remove masking tape as soon as the bead is tooled.
Product safety information required for safe use is not included in this document. Before handling, read product and container labels for safe use, physical and health hazard information.
DOWSIL 789 Silicone Weatherproofing Sealant is not approved for use as a structural sealant. It should not be used:
In below-grade applications
When surface temperatures exceed 50°C (122°F)
On surfaces that are continuously immersed in water
On building materials that bleed oils, plasticizers or solvents, green or partially vulcanized rubber gaskets or tapes
On frost-laden or wet surfaces
In totally confined joints (the sealant requires atmospheric moisture for cure)
If the sealant is intended to be painted (paints do not typically adhere to most silicone sealants)
To surfaces in direct contact with food or other food-grade applications
This product is neither tested nor represented as suitable for medical or pharmaceutical uses.
Usable Life And Storage:
When stored at or below 30°C (86°F) in the original unopened containers, DOWSIL 789 Silicone Weatherproofing Sealant has a usable life of 12 months from the date of manufacture. Refer to product packaging for Use By date".
This product is available in 300 ml disposable cartridges and in 500 ml foil sausages depending on location of purchase.