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Dowsil Silicone Weather Proofing Sealant DS-789 - Clear (300 ml)
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Dowsil Silicone Weather Proofing Sealant DS-789 - Clear (300 ml), DS-789-Clear

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Dowsil Silicone Weather Proofing Sealant DS-789 - Clear (300 ml)

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Product Specification

Brand
Colour
Clear
Packaging
Disposable Cartridges
Volume
300 ml
Working Time
15-30 Minutes
Model No.
DS-789
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Dowsil Silicone Weather Proofing Sealant DS-789 - Clear (300 ml)

Product Description

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

Composition:

  • One-part, neutral-cure, RTV silicone sealant

Properties:

  • 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

Typical Properties:

  • 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

Application:

  • 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:

  • 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.
  • 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.

Handling Precautions

  • 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.

Limitations:

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".

Packaging Information:

  • This product is available in 300 ml disposable cartridges and in 500 ml foil sausages depending on location of purchase.

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