3:1 Ratio Heat Shrinkable Tubing

• High shrink ratio helps to seal and protect awkwardly-shaped objects with varying diameters
• Flame retardant and heat resistant to protect cables against damage from high temperatures
• Adhesive lining (included in the "dual wall" option) creates a tight seal between tubing and wires, so that the tubing won't shift or slide off
• Less than 10% shrinkage in the axial (lengthwise) direction, so you can better estimate the length of material you will need
• Passes UL VW-1, CSA OFT, -F- MARK for safety specifications

3:1 Heat Shrink is ROHS (Restriction of Hazardous Substances) Compliant

Adhesive Lined Tubing

The adhesive version of our 3:1 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, watertight seals, or wire color-coding (for example, to help identify positive and negative battery connections).

3:1 Heat Shrink Technical Specifications
Minimum Shrink Temperature: 120° C

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

• View 3:1 Adhesive Heat Shrink Technical Specs
• View Military Specifications & Manufacturers' Cross Reference

• 3:1 Heat Shrink is ROHS Compliant
• Measurement Conversion Chart for Milimeters, Decimals and Fractions

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.

3:1 Heat Shrink - PER FOOT AND BULK

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.

PER FOOT
Discount pricing is automatically calculated based on quantity entered at checkout.

BULK SPOOLS

3:1 Heat Shrink - Technical Specifications. click here
For military specifications and a manufacturers' cross reference, click here
Normally our policy is to supply continuous lengths. If it is absolutely necessary to receive one continuous length, please specify.

Dual Wall 3:1 - PER FOOT

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.

The longest continuous length available is 4 ft.

Dual Wall 3:1 - CUT PIECES
Please Note: Our Diameters for Heat Shrink Tubing are measured as ROUND TUBE, NOT FLAT
Custom Sizes and Cut Pieces are NON-RETURNABLE and NON-REFUNDABLE

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

• Instructions on how to use Heat Shrink Tubing
• Not sure what size to use? Click here
• How do we measure Heat Shrink?

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.

RELATED ARTICLES -

• Heat Shrink Tubing: How It Was Invented, and Why We Use It
• Terminate the ends of your Braided Sleeving? Click here
• The Handyman's Guide to Improvisation: 7 New Ways to Use Heat Shrink Tubing

HOW-TO CORNER -

• Instructions on how to use Heat Shrink Tubing. Click here
• Terminate the ends of your Braided Sleeving? Click here
• How do we measure Heat Shrink? View here