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HEAT SHRINK TUBING SELECTION CENTER

WHICH HEAT SHRINKABLE TUBING MATERIAL SHOULD I USE?

To answer this question you have 2 choices ...

  • Call or E-mail Insultab’s friendly, knowledgable Customer Service Department for assistance
    (800) 468-4822 / info@insultab.com
  • Read the Information Below

In selecting the best type of tubing for your application, the critical factor to consider is the environment where tubing will be used.

  • TEMPERATURE Select the tubing material that operates within the temperature range of the environment.
  • ABRASION PROTECTION Will the tubing stand up to abrasion or will it be used to provide protection from damage and abuse?
  • STRENGTH Tensile Strength is a measurement of the amount of stretching required to break or rupture the tubing. Tensile strength may be affected by the thickness of the tubing wall.
  • ELECTRICAL INSULATION Dielectric Strength is a measure of the electrical insulation provided - the voltage that the tubing can withstand before dielectric breakdown occurs.
  • WATER RESISTANCE Will the tubing be exposed to water, salt water, liquids, moisture?
  • FLEXIBILITY Tubing materials range from very flexible to semi-rigid.
  • UL VW-1 FLAMMABILITY TEST REQUIREMENTS Underwriter’s Laboratories (UL) operates a testing and accreditation service for electrical and electronic materials and equipment. VW-1 is a flammability test conducted by UL or CSA (Canadian Testing Standards). Tubing with a VW-1 rating is highly flame-retardant.
  • UV RESISTANCE Will the tubing be exposed to UV light in outdoor applications?
  • SHRINK RATIO Heat shrink tubing shrinks and conforms to the underlying materials. The greater the size variations of the underlying materials being covered, the larger the shrink ratio required.
  • STANDARD COLORS In addition to its standard colors, Insultab does custom color matching.

HOW TO SELECT THE CORRECT SIZE OF HEAT SHRINKABLE TUBING

HEAT SHRINK TUBING VOCABULARY

I.D. - Inside Diameter
The Inside Diameter of the tubing is measured in inches (in.) or millimeters (mm). Measure the open inside circle. Do not measure the tubing when it is flattened.
Expanded I.D. - Expanded Inside Diameter
The Expanded I.D. measures the minimum size of the Inside Diameter after the tubing has been expanded. Heat shrink tubing is sold in its EXPANDED I.D. size.
Recovered I.D. - Recovered Inside Diameter
When heat is applied to expanded tubing, the tubing will shrink or recover. The Recovered I.D. is the measurement of the Inside Diameter of the tubing after being allowed to FULLY SHRINK or RECOVER back to its original extruded size.

1. Determine the diameter size of the tubing.

Measure the diameter of the underlying materials to be covered - at the widest part.

Select tubing that is 20% - 30% larger than this measurement by referring to the product’s Technical Data

2. Determine the shrink ratio of the tubing.

Heat shrinkable tubing is available in 2:1, 2.5:1 or 3:1 shrink ratios meaning the tubing has been expanded to twice, two and a half times or three times its fully recovered size. The greater the size variations of the underlying materials being covered, the larger the shrink ratio required.

For example:
2:1 shrink ratio: 1/2" will recover to 1/4" — 50% shrinkage.
3:1 shrink ratio: 3/4" will recover to 1/4" — 67% shrinkage.

3. Determine the wall thickness of the tubing.

Nominal Recovered Wall Thickness - The target thickness of the wall after complete recovery. The Wall Thickness of the tubing is measured in inches (in.) or millimeters (mm). Refer to the tubing’s Technical Data to determine the thickness of the wall.

4. Determine the length of the tubing.

Longitudinal Shrinkage: Heat shrinkable tubing has a small loss of length during the recovery process. Take into account the change of length of the recovered tubing (after shrinking). Longitudinal shrinkage varies from 5% to approximately 15% - depending on the material. Refer to the Tubing’s Technical Data for the shrinkage information.

JUST CALL US, E-MAIL US OR SEND US YOUR SAMPLE... WE WILL BE HAPPY TO ASSIST YOU IN SELECTING THE CORRECT DIAMETER, WALL THICKNESS AND ‘CUT LENGTH’ FOR YOUR APPLICATION!

Call or E-mail for friendly, knowledgable, immediate sales and product assistance: (800) 468-4822 info@insultab.com