PIB SELF AMALGAMATING TAPES
self-amalgamating tapes based on polyisobutylene (PIB).
Uses: For jointing (splicing) and repair of a wide range of power and distribution cables up to 46 kV.
This tape is used on a large scale by Postal and Telephone
Authorities for making watertight seals at polyethylene sleeve joints on polyethylene-sleeved
telephone cables, both above and below ground.
The tapes can also be used for protection against corrosion on, for example, metal pipe-work (particularly at welds or joins) and the waterproofing of many electrical components.
Main Features: Good physical and electrical properties.
The electrical properties show a high degree of stability under conditions of use. The tapes amalgamate rapidly when applied under tension (as described in "Application" Section) to provide a void-free homogenous wrapping, without the need for external heat or pressure. They are compatible with a wide range of rubber and plastic dielectric cable insulation. These include polyethylene, cross-linked polyethylene, ethylene propylene rubber, PVC, butyl, neoprene and many others.
The tapes are interleaved with an easy to remove plastic film. The tapes themselves are non tacky and easy to handle and apply.
They are highly resistant to prolonged immersion in water and have excellent resistance to ozone. They are compatible with most hot pouring compounds used in joint-boxes. Pouring temperatures of up to 145ºC will not affect the tapes. They are compatible with epoxy and acrylic resin systems. The tapes will remove cleanly from most surfaces when cut, allowing them to be used as a temporary insulation/protection.
They have a "locking point", i.e.. they become more difficult to stretch at very high elongations, preventing over stretching or breaking during application.
NOTE: The tapes are not resistant to hydrocarbon based solvents, oils and greases. They should not be used in contact with transformer oils or the oils used in paper cable impregnants as these will cause softening of the tapes.
Application: Strip back the interleaving and stretch the tape to reduce its width by between one third and one half. Keep the tape under tension and wrap, overlapping successive layers by 50% until the desired build-up of insulation is achieved. Finish the wrapping by holding the tape under thumb and snap by stretching.
The high degree of stretch as described above will prevent the inclusion of voids and ensures rapid amalgamation.
Storage: The rolls of tape
must be stored flat on their cut edges in the original packing until required
for use, and must be protected from dust, heat, moisture, direct sunlight,
corrosive and solvent fumes. Under these conditions the storage life of
the tape in a temperate climate will be not less than five years.
Product Testing: Users are recommended to test the tape for its suitability in their particular application.
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