Home > Densyl™ Mastic Densyl™ Mastic Self-supporting, flexible mastic for sealing, filling voids and caulking purposes. Used to fill awkward angles prior to wrapping with Denso™ Petrolatum Tapes or Denso Bitumen Tapes. For use on mechanical joints, flanges, fittings and valves. Densyl™ Mastic is available as a blanket or in triangular strips, round strips or 3 kg blocks. resources contact us Packing Information Leaflets Product CodeSizeUnits Per Carton 83070053kg6 8307010Round Strips20 8307011Triangle Strips12 WCD Protection of Pipeline Fittings and Valves leaflet BECOME A DENSO DISTRIBUTOR Interested in becoming a distributor or looking to find your local stockist? Contact us today. UK DISTRIBUTOR RESOURCES Browse our collection of useful marketing assets for Denso™ and Sylglas™ distributors.