Mastech Butyl Mastic sealant is one component, flexible, non-hardening, non-drying, non-oxidizing butyl elastomer sealant with excellent adhesion to most common substrates.

Seals and Bonds

Variety of metals, Wood, Glass, Concrete, Asphalt, Plastic, Gypsum, Foam boards, Masonry surfaces

Mastech Butyl MasticUsages

  • Curtainwall joints
  • Ribbed roof panels
  • Metal finishes
  • Precast construction
  • Roofs, gutters and downspouts
  • Heating and air conditioning ducts
  • Secondary glazing
  • Acoustical sealant
  • Vapor barrier
  • Fixing and isolating kitchen and vanity tops, bathtubs and sinks


  • Excellent adhesion
  • Excellent flexibility
  • Excellent water resistance
  • Excellent pumpability and gunnability
  • Non-corrosive to metals
  • UV resistant

Typical Physical Properties

Tack Free Time                                                                Permanently    Tacky

Specific Gravity                                                                1.57 ±0.07

Service Temperature                                                      -50 °C to 100 °C

Application Temperature                                              -20 °C to 50 °C

Water and Chemical Resistance Excellent Colors    Black, Grey


  • 400 g Cartridges
  • 20 kg Pails