4:1 Heat Shrink Tubing
Over-Expanded Flame Retardant Polyolefin Tubing

Our 4:1 over-expanded polyolefin heat shrink tubing is flexible, flame-retardant and used for specialty applications that include cable jacket retrofitting and repair, as well as the electrical insulation of wire assemblies with oversize components or connectors. The over-expanded product fits easily over the end of a connector, and shrinks down to 25% of its original diameter to fit snugly over both the connector and any narrower attached wires. Available in Black, and sold by the foot.

Adhesive-Lined Heat Shrink
The adhesive version of our 4:1 heat shrink features “dual-wall” design, which is made up of an outer polyolefin (heat shrink) tube lined with a interior coating of heat-activated adhesive. During application, as the outer tubing shrinks, the inner layer melts, flows, and then resets when cooled, helping the tubing to achieve a snug, moisture-resistant fit around wire harnesses, cables and connectors. We recommend it for applications that require strain relief and watertight seals.

• Due to the nature of heat shrink, it shrinks lengthwise as well as in diameter. 4:1 heat shrink will shrink 14% or less in the axial direction during the shrink process.
• 4:1 Heat Shrink is RoHS Compliant, view the certificate here
• View Military Specifications and Manufacturers' Cross Reference

Specification reference:
MIL-I-23053/5 Class 1 and Class 3. MIL-R-46846, Type V
UL 224 125°C, 600 V, VW-1 File E48762 YDPU2

LG heat shrinkable and non-shrinkable tubing products do not contain the compound Di (2-ethylhexyl) phthalate commonly referred to as DEHP.

In addition, LG heat shrinkable and non-shrinkable tubing products do not contain PFOS (perfluoroctane sulfonate), PFOA (perfluorocanoic acid) or Tinuvin 320.

4:1 Adhesive Heat Shrink Tubing
Minimum Shrink Temperature: 90°C
Product Dimensions

*Metric sizes available for special orders.

View Measurement Conversion Chart

STANDARD WALL

Please Note: Our Diameters for Heat Shrink Tubing are measured as ROUND TUBE, NOT FLAT
Due to the nature of the materials, all braided sleeving, wire loom, heat shrink, and spiral wrap products sold by the foot will not be refunded IN FULL if they are cut up in sections of 20' or shorter. 50% restocking fee on returns of 20 feet or less. 25% restocking fee if there is a reorder.

Normally our policy is to supply continuous lengths. If it is absolutely necessary to receive one continuous length, please specify.

Dual Wall

Please Note: Our Diameters for Heat Shrink Tubing are measured as ROUND TUBE, NOT FLAT
Due to the nature of the materials, all braided sleeving, wire loom, heat shrink, and spiral wrap products sold by the foot will not be refunded IN FULL if they are cut up in sections of 20' or shorter. 50% restocking fee on returns of 20 feet or less. 25% restocking fee if there is a reorder.

Limiting Oxygen Index (LOI)
The ratio of how much oxygen - as compared to other gases - needs to be present in the air surrounding a particular material in order for that material to burn. The fact that Earth's normal atmospheric air contains around 21% oxygen is used a reference point when materials are classified into burn categories that are based on Limiting Oxygen Index. Substances that are combustible in air containing less than 21% oxygen are considered flammable, while those that burn in the range of anything greater than 21% but less than 28% are typically labeled "slow burning". Any material with an LOI that exceeds 28% is classified as self-extinguishing.

In the table below, you'll find a list of polymers commonly found in our heat shrink tubing and braided sleeving products, along with their LOIs and the burn categories each falls into.

ARTICLES - A place to find educational articles covering a wide range of topics, all categorized according to your areas of interest. Learn more

• Heat Shrink Tubing: How It Was Invented, and Why We Use It
• The Handyman's Guide to Improvisation: 7 New Ways to Use Heat Shrink Tubing

HOW-TO CORNER -

• How to use Heat Shrink Tubing
• Terminate the ends of your Braided Sleeving with Heat Shrink
• How do we measure Heat Shrink?