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      Heat Shrink Basics

      Simple Guide to Heat Shrink

      heatshrink diameter

      Heat Shrink is a common and important part of protecting and providing insulation for cables and wires. Heat shrink can also provide protection against abrasion, chemicals and weather.

      Heat Shrink tubing is an expandable plastic sleeve that is designed to shrink when it is heated to wrap around wires. Many people install heat shrink themselves as it is a cheap and easy option that is super easy to fit or install.

      There is a wide variety of Heatshrink - Colours, Sizes, Materials and Lengths. 

      1) Heatshrink Uses:

      • Cable Protection

      • Mechanical Protection against abrasion

      • Protection against Environmental conditions such as damp, contaminants, light and chemicals

      • Aesthetics and to organise / colour code wires or cables

      • Bundling cables neatly 

      2) Shrink Ratio:

      The most common heat shrink ratios are 2:1, 3:1 and 6:1. This means that Heat Shrink tubing with a 2:1 ratio will shrink down to  half of it's expanded diameter.

      3) Selecting the Correct Size:

      Our heat shrink is measured and specified by the preshrink internal diameter  and NOT the flat width of the heat shrink which is different! This is an important difference and is a common mistake across the industry.

      It is generally advised that the heat shrink selected should be 1.5 x larger than the items or wire it is to be fitted over.

      heatshrink size

      4) Materials:

      Most Heatshrinks are either PVC or Polyolefin with the primary differences being cost and working temperature.

      PVC is generally cheaper than Polyolefin however the Polyolefin tubes tend to have a wider operating range. Dependent on the intended use, PVC or Polyolefin may be appropriate.

      Adhesive lined Heatshrink is available which has an interior adhesive that melts upon application of heat to form a protective waterproof seal. This therefore provides extra protection when sealed from environmental conditions such as moisture or contaminants.


      Our Range of Heatshrink


      Coloured 2:1 Heatshrink   We stock a range of 2:1 Heat shrink in Black, Red, Blue, Green, Yellow, White and Clear. The heat shrink is polyolefin tubing and is supplied in 1.2m lengths. This type of heat shrink is a versatile but low cost option   2:1 heatshrink
      Black 3:1 Adhesive Lined Heatshrink   We stock a range of Black 3:1 adhesive lined heat shrink in a range of sizes from 2.4mm to 50mm. This heat shrink provides excellent insulation and protection against wear with corrosion resistant performance.   adhesive heat shrink
      Heatshrink  Mini Reels in Dispenser Boxes   This is a super handy style of heatshrink that is contained on mini reels in boxes which provide an easy dispensing solution for a range of heat shrink sizes in 15m  or 20m lengths.   heatshrink dispenser
      Heatshrink End Caps   A range of Heat Shrink end caps are available and are used to seal the ends of cables from moisture and corrosion. An excellent durable solution with a shrink temperature of 110 Degrees C.   heat shrink caps
      Heatshrink Assortments    Heat shrink handy kit containing a wide range of sizes and colours housed in a handy compartment box.    heatshrink assortment

       This is intended as a general guide to heatshrink - every application is different so it is important to consider all factors above when picking the correct heat shrink for your job. For any assistance please get in touch!

       Check out our full range of Heatshrink and Cable Management Solutions here