A self-supporting petrolatum mastic for moulding and filling irregular profiles – available in strips, blocks or as a blanket.

Surface Preparation

  • Hand Tool Cleaning


Densyl Mastic is used to build up, smooth the profile and eliminate voids before applying Densyl Tape or Denso Tape when protecting mechanical joints, flanges, fittings and valves.

Densyl Mastic is available as a blanket or in triangular strips, round strips or 3 kg blocks.


  • Easy to handle over a wide range of temperatures
  • 60+ years proven use by public utility companies
  • Easily removed when inspection is required
Technical Data Sheet

Densyl Mastic

Densyl Mastic Blankets

Application Instructions

Densyl Mastic IFU

Densyl Mastic Blankets


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