Dowsil 789 Clear 300ml


Dow Corning Dowsil 789 - Weatherproof, One-part, Neutral Cure Silicon Sealant - for general architectural weathersealing.

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Rs. 200.01


Rs. 300.00

Data sheet

Sealant Curing SystemNeutral / Moisture Cure
Skin Formation Time (min)10-15 mins
Temperature Resistance Range-50C to 150C
Elongation at Break700%
Adhesion to SurfaceAnodized Aluminum, Concrete, Enamelled & Reflective Glass,Fluorocarbon Coated Aluminum. Glass, Heat Strengthened Glass, Low E Coated Glass, Metal Panels, Polyester Powder Coated Aluminum/Steel, Stainless Steel
Shrinkage after CuringLow

More info

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.


  • 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 etc.
  • Ease of application - ready to use as supplied

Areas of Application

DOWSIL 789 Silicone Weatherproofing Sealant is a premium performance weather sealing product specifically designed for general glazing and weather sealing in curtain wall and building facades.

Method of Applicaiton


  • 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.


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Dowsil 789 Clear 300ml

Dowsil 789 Clear 300ml

Dow Corning Dowsil 789 - Weatherproof, One-part, Neutral Cure Silicon Sealant - for general architectural weathersealing.

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