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Shrink ratio

The shrink ratio indicates how much heat shrink tubing contracts when heated. This is important when choosing the right type of shrink tubing. Different types of heat shrink tubing have different shrink ratios — these are listed in the product name as “2:1” (2 to 1), “3:1” (3 to 1), and so on. All available variants of these types (different sizes, shapes, and packaging options) share the same shrink ratio.

Products 1-24 of 33

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  1. Twee zwarte H-2(Z) dunwandige krimpkousen naast elkaar, één in het originele formaat, en één aan het uiteinde gekrompen.
    WKK - H-2(Z) - Thin-wall heat shrink tubing - 2:1 - Operating temperature up to 125 °C
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  2. A reel of white thin-wall heat shrink tubing, H-2(Z) 2PF, 100 meters, of the brand Hongshang.
    WKK - H-2(Z) 2PF - Thin-wall heat shrink tubing - 2:1 - Printable - Operating temperature up to 125 °C
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  3. A reel of white thin-wall heat shrink tubing, H-2(Z) 3PF, 50 meters, of the brand Hongshang.
    WKK - H-2(Z) 3PF - Thin-wall heat shrink tubing - 3:1 - Printable - Operating temperature up to 125 °C
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  4. Two black H-2(3X) thin-wall polyolefin heat shrink tubes next to each other, one in the original size, and one shrunk to two different sizes.
    WKK - H-2(3X) - Thin-wall heat shrink tubing - 3:1 - Operating temperature up to 125 °C
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  5. Two black H-2F thin-wall polyolefin heat shrink tubes next to each other, one in the original size, and one with the end part shrinked.
    WKK - H-2F - Thin-wall heat shrink tubing - 2:1 - Operating temperature up to 135 °C
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  6. Two black H-2F thin-wall polyolefin heat shrink tubes next to each other, one in the original size, and one with the end part shrinked.
    WKK - H-2R - Thin-wall heat shrink tubing - 2:1 - Operating temperature up to 135 °C
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  7. Two black H-2F(3X) thin-wall polyolefin heat shrink tubes next to each other, one in the original size, and one shrunk to two different sizes.
    WKK - H-2F(3X) - Thin-wall heat shrink tubing - 3:1 - Operating temperature up to 135 °C
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  8. Two black H-2F(4X) thin-wall polyolefin heat shrink tubes next to each other, one in the original size, and one shrunk to two different sizes.
    WKK - H-2F(4X) - Thin-wall heat shrink tubing - 4:1 - Operating temperature up to 135 °C
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  9. Two black H-2(HF) thin-wall polyolefin heat shrink tubes next to each other, one in the original size, and one with the end part shrinked.
    WKK - H-2(HF) - Thin-wall heat shrink tubing - 2:1 - Halogen free - Operating temperature up to 125 °C
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  10. Two yellow-green H-2F(Y/G) thin-wall polyolefin heat shrink tubes, one in the original size, and one with the end part shrinked.
    WKK - H-2F(Y/G) - Thin-wall heat shrink tubing - 2:1 - Yellow/Green - Operating temperature up to 135 °C
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  11. Two yellow-green H-2F(Y/G) thin-wall polyolefin heat shrink tubes, one in the original size, and one with the end part shrinked.
    WKK - H-2F(Y/G) - Thin-wall heat shrink tubing - 3:1 - Yellow/Green - Operating temperature up to 135 °C
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  12. Two black H-2(LS) thin-wall polyolefin heat shrink tubes next to each other, one in the original size, and one with the end part shrinked.
    WKK - H-2(LS) - Thin-wall heat shrink tubing - 2:1 - Min. shrink temperature 65 °C - Operating temperature up to 125 °C
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  13. Two black H-1 thin-wall polyolefin heat shrink tubes next to each other, one in the original size, and one with the end part shrinked.
    WKK - H-1 - Thin-wall heat shrink tubing - 2:1 - Not flame retardant - Operating temperature up to 105 °C
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  14. Two black H-5(3X)-F dual-wall polyolefin heat shrink tubes, one in the original size, and one shrunk to two different sizes.
    WKK - H-5(3X)-F - Thin-wall heat shrink tubing - 3:1 - With adhesive - Operating temperature up to 135 °C
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  15. Two black H-5(3X)-F dual-wall polyolefin heat shrink tubes, one in the original size, and one shrunk to two different sizes.
    WKK - H-5R(3X) - Thin-wall heat shrink tubing - 3:1 - With adhesive - Halogen free - Operating temperature up to 125 °C
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  16. Two black H-5(3X)-F dual-wall polyolefin heat shrink tubes, one in the original size, and one shrunk to two different sizes.
    WKK - H-5R(4X) - Thin-wall heat shrink tubing - 4:1 - With adhesive - Halogen free - Operating temperature up to 125 °C
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  17. Two black H-5(4X)-F dual-wall polyolefin heat shrink tubes, one in the original size, and one shrunk to two different sizes.
    WKK - H-5(4X)-F - Thin-wall heat shrink tubing - 4:1 - With adhesive - Operating temperature up to 125 °C
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  18. Two black HBK dual-wall polyolefin heat shrink tubes next to each other, one in the original size, and one shrunk to two different sizes.
    WKK - HBK - Thin-wall heat shrink tubing - 4:1 - With adhesive - Min. full shrink temperature 135 °C
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  19. A white H-175K special heat shrink tube on a white background.
    WKK - H-175K - Kynar® - Thin-wall heat shrink tubing - 2:1 - Operating temperature up to 175 °C - Resistant to chemicals
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  20. Two black H-200E special heat shrink tubes next to each other, one in the original size, and one with the end part shrinked.
    WKK - H-200E - Viton® - Thin-wall heat shrink tubing - 2:1 - Operating temperature up to 200 °C - Resistant to chemicals
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  21. Two transparant HTFE special heat shrink tubes next to each other, one in the original size, and one with the end part shrinked.
    WKK - HTFE - Teflon® - Thin-wall heat shrink tubing - 1.5:1 - Operating temperature up to 260 °C - Resistant to chemicals
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  22. Vier transparante HFSP krimpbare glasvezel kabelverbinders (speciale krimpkous), zijaanzicht, op een witte achtergrond.
    WKK - HFSP - Heat shrinkable fibre optic splice protectors - 2:1 - Operating temperature up to 100 °C
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  23. Two black HRA2 medium-wall polyolefin heat shrink tubes next to each other, one in the original size, and one with the end part shrinked.
    WKK - HRA2 - Medium-wall heat shrink tubing - 3:1 - With adhesive - Operating temperature up to 110 °C
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  24. Two black HR2 medium-wall polyolefin heat shrink tubes next to each other, one in the original size, and one with the end part shrinked.
    WKK - HR2 - Medium-wall heat shrink tubing - 3:1 - Without adhesive - Operating temperature up to 110 °C
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Available shrink ratios

Heat shrink tubing is available in six different shrink ratios:

The shrink ratio represents the relationship between the inner diameter of the tubing before and after shrinking. These are indicated as the "as supplied" inner diameter and the "after shrink" inner diameter. For example, if a heat shrink tube has an inner diameter of 30 millimeters before shrinking, the resulting inner diameters after shrinking are as follows:

  • 1.5:1 → inner diameter after shrink: 20 mm
  • 2:1 → inner diameter after shrink: 15 mm
  • 2.5:1 → inner diameter after shrink: 12 mm
  • 3:1 → inner diameter after shrink: 10 mm
  • 4:1 → inner diameter after shrink: 7.5 mm
  • 6:1 → inner diameter after shrink: 5 mm

How to choose the right shrink ratio

To select the right shrink ratio, first determine the diameter of the object the tubing will be used on — for example, the diameter of a cable. Then choose a shrink tube with a post-shrink inner diameter that is slightly smaller than the diameter of the object. For example: 


Suppose you have a cable with a diameter of 0.5 millimeters. Then choose a heat shrink tube with an inner diameter after shrink of 0.4 millimeters. If the shrink tube has a 3:1 shrink ratio, the pre-shrink diameter needs to be 1.2 millimeters (0.4 × 3).


Need help determining the right size and shrink ratio? Feel free to contact our advisors — they’ll be happy to assist you.

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