Heatshrink tubing offers the folowing benefits to pvc wrapped wiring bundles :
mechanical protection
chemical / fluid resistance
electrical insulation
moisture protection
strain relief
flame retardant
fast wiring installation
There are many variations of heatshrink. Key properties to look out for :
shrink ratio
flexibility when shrunk down
chemical resistence
being able to be bonded to to enable waterproofness
DR25 is the king of motorsport heatshrink. Very flexible, high 2:1 shrink ratio and as the name says, Diesel Resistant. Availabe in imperial sizes from 1/8th to 1 inch. Other sizes available on request. Moulded boots and shapes are made from DR25.
A close second in performance is RNF. Not quite as flexible is has a thinner wall that makes it well suited smaller areas. Also 2:1 shrink ratio with a very good abrasion and chemical resistance. This can be used nearly every where except where fuel and solvents are present.
ATUM is an adhesive lining that melts at around 100 degrees. This makes it suitable for joints and sealing the back of simple connectors. 3:1 shrink ratio.
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