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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

Disposable Cartridges
300 ml
Working Time
15-30 Minutes
Model No.
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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


  • 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

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


  • 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.


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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