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DOWSIL Q3-1566 Heat Resistant Adhesive/Sealant

Dowsil Q3-1566 / Dow Corning Q3-1566 is a high temperature resistant silicone sealant.

DOWSIL Q3-1566 Heat Resistant Adhesive/Sealant

Dowsil Q3-1566 formerly Dow Corning Q3-1566 is a one-component adhesive/sealant for sealing and bonding applications that are exposed to high temperatures of 275°C. This silicone sealant is easy to apply and non-sagging making it suitable for vertical applications and for filling gaps to create a tight seal. When exposed to moisture in the air, Dowsil Q3-1566 will cure at room temperature to form a tough, flexible rubber. This adhesive remains flexible and stable from -50 to 275°C.


  • Dowsil Q3-1566 can be used to seal industrial ovens and boilers, domestic cookers, ceramic hobs, cookers and other heating equipment.
  • Other applications include flanges in equipment in chemical plants, automotive oil and other coolant sealing applications.


  • One component adhesive/sealant
  • Heat resistant
  • Cures at room temperature when exposed to moisture in the air
  • Acetoxy cure system
  • Non-sag paste
  • Easy to apply
  • Good adhesion on many substrates
  • Stable and flexible from -50°C to 275°C
  • Cures to a tough, flexible rubber
  • Black colour

Surface Preparation

  1. Surfaces must be clean and dry
  2. To degrease surfaces, use a solvent such as an isopropyl alcohol or using an impregnated wipe like Wipemaster Wipe 9 IPA Wet Wipes to remove loose particles and debris
  3. Dowsil 1200 OS Primer can be used before applying the product to improve the adhesion
  4. Dowsil 1200 OS Primer can be applied by dipping, brushing or spraying the product onto the substrate
  5. Allow the primer to dry for 15-90 minutes at room temperature with a humidity of 50% or higher

Always read the product Technical data sheet before applying the product.

This product is part of the DOWSIL range

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