Densyl Mastic is a cold applied self-supporting mastic. Densyl Mastic Blankets are preformed sheets of mastic supported by a fabric backing. It is a petrolatum compound containing inert siliceous fillers and vegetable fibers.

CSA Z245.30 component; Meets AWWA C217 Standard
Excellent sealing properties
Will adhere to metal, PVC, polyethylene and concrete
Not effected by water, acids and salts
Inert and environmentally stable


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Densyl Mastic is used for sealing, filling and caulking applications where a protective, waterproof and non-setting mastic is required
It can be used to contour tank bases and profile irregular surfaces
Easy application
Minimal surface preparation (SSPC SP 2-3)
Densyl Mastic Blankets are used to contour flanges, couplings, valves and irregular surfaces
It is applied prior to the tape application and generally used in conjunction with primer, Denso Petrolatum Tapes or Denso Bituminous Tapes

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