A self-supporting and non-setting mastic for sealing cable entries and ducts.

Surface Preparation

  • Hand Tool Cleaning


Densoseal 16A is a firm, fibrous mastic based on mineral fillers, organic fibres and water displacing materials. It is a non-setting, self-supporting mastic which may be applied to wet surfaces and will seal ducts and conduits against ingress of gas and water. It complies with British Telecom Specification M212C. Used for sealing cable ducts, conduits and service entry pipes or sleeves particularly below ground level to prevent the entry of gas or water into buildings. It may also be used for profiling mechanical joints on hot pipes to allow application of tapes.

Densoseal 16A is packed into the ends of the duct by hand and moulded firmly around cables and against the duct to ensure there are no gaps or fissures. The mastic should be packed to a depth of at least equal to the diameter of the duct. Surfaces should be free from loose rust, scale, dirt or previous sealants.


  • Seals against water and gas ingress
  • Stable in composition and plasticity, even at high temperatures
  • Complies with British Telecom Specification M212C
  • Adheres to wet or dry surfaces of iron, steel, glazed earthenware, lead, brass, polythene and PVC
  • Non-hardening, non-cracking and self-supporting compound
  • Accommodates vibration, mechanical stresses or movement of substrate
Technical Data Sheet

Densoseal 16A

Application Instructions

Densoseal 16A IFU


WCD Densoseal 16A

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