IsolAtec: contact voltage isolation and waterproofing membrane - Vexcolt

IsolAtec: contact voltage isolation and waterproofing membrane

Product Applications

  • Electrified rail depots
  • Platform screen doors at railway station platforms, walls and columns
  • Viaducts and bridges
  • Power stations, electrical sub-stations and other utilities
  • Electrical riser rooms
  • Location where embedded electrical conduits are installed
  • Electrical isolation of metalwork such as expansion joints, control joints and other conductive materials that pass through electrically isolated areas
  • Petrol chemical plants and holding tank areas

Suitable Substrates
Isolatec CVIM will adhere to most building surfaces including concrete, timber, structural sheeting, gypsum boards, masonry surfaces, polycarbonate, PVC pipes and most metals (including steel and aluminium) when installed with Isolatec-P water- based primer.




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Contact voltage isolation and waterproofing membrane

Isolatec CVIM is a Contact Voltage Isolation and Waterproof Membrane (CVIM) specifically formulated to prevent the transfer of static electrical current through concrete slabs and walls in both dry and wet conditions. Whilst suitable for a wide range of uses, Isolatec CIM helps protect passengers and workers boarding or working on electrified rail systems. It is a vital component in protecting passengers from static discharge where platform screen doors are installed.

With a thickness of 2.5mm the Isolatec CVIM has a volume resistivity of 5.73 x 10^14 ohm-cm and out performs all other known voltage isolation membranes of the same thickness.
Comprising a specially formulated butyl rubber membrane which contains neither bitumen nor bentonite, the Isolatec CVIM has a self-adhesive base layer for bonding the membrane to differing substrates such as concrete slabs and metalwork. This self-adhesive side of the membrane provides an instant high-strength bond to the surface of most major construction substrates.

The upper layer of Isolatec CVIM incorporates a non-woven polyester fleece surface layer. This layer allows the application of a variety of finishing materials including concrete and screed toppings as well as chemical and fire proof cement based materials. Through this fleece layer, the concrete and screed toppings will form a high-strength bond to the membrane and indirectly through the membrane’s self-adhesive layer to the underlying slab or other substrate.

Similarly a high-strength bond will be formed with plaster, render, cementitious coatings, resins, paints, tile adhesive and other similar materials applied in vertical and overhead planes.
This fully bonded system prevents delamination between the substrate and the topping which helps maintain the integrity of the floor, wall, column and ceiling finishes.

Isolatec CVIM also helps isolate finishes zones from movements in underlying substrates as it offers high crack-bridging characteristics up to 3mm. The flexibility of the butyl core absorbs these deflections and helps prevent substrate cracking from transferring through to fragile applied finishes.

Additional information


Product roll length – 10 metres
Product roll width – 500 mm
Product thickness – 2.5 mm

Weight (ASTM D37760):

68 g/m2

Volume resistivity (ASTM D257):

5.73 x 10^14 ohm-cm

Tensile strength (ASTM D257):


Hydrostatic resistance at 2 Bar (DIN16726):

No leaks

Peel adhesion strength to concrete (ASTM D903):


Lap peel adhesion (ASTM D1876):


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