A single component, low viscosity, self-wetting, butyl blend mastic designed to be used in conjunction with roofing and waterproofing systems. It is an extremely tacky material and is primarily used as a sealing agent between various membranes and when they are terminated using a compression type seal.

General information

Uniclass 2015

Pr_30_31_76_09 Butyl rubber construction joint sealantsPrimary


J40/297 Waterproofing/ Damp proofing membrane

J42/10 Warm deck roof covering

J42/110 Warm deck roof covering

J42/120 Inverted roof covering

J42/130 Cold deck roof covering

Specification data - Butyl rubber construction joint sealants

Product Reference

Water Cut-Off Mastic

Standard product features



Technical properties:

  • Flash point: 4°C.
  • Solids: 80%.
  • Specific gravity: 1.29.
  • VOC: 250 g/L.