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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
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.

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