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3:1 Ratio Heat Shrinkable Tubing
Professional-Grade Polyolefin Tubing With or Without Adhesive Lining
3:1 Heat Shrink Tubing
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What's special about this flame retardant heat shrink?
Our 3:1 heat shrink tubing is an effective way to insulate cables, provide extra strain relief, or professionally finish the ends of wire harnesses. The over-expanded tubing slides easily over bulky connectors, and then shrinks down to 33% of its original diameter to fit snugly around both connectors and the wires attached to them. For an extra tight bond, choose adhesive heat shrink, which efficiently and attractively terminates cable snakes, and prevents fraying along the cut edges of expandable braided sleeving. |
Available in several colors, making it easy to match your wiring scheme or color-code 
- 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
| Size | Expanded | Recovered | ||||
| Internal Diameter Minimum (D) | Internal Diameter Maximum (d) | Minimum Total Wall Thickness (t) | ||||
| Metric (Inch) | In. | mm | in. | mm | in. | mm |
| 1.5mm (1/16") | 0.059 | 1.5 | 0.020 | 0.5 | 0.0157 | 0.40 |
| 3mm (1/8") | 0.118 | 3.0 | 0.039 | 1.0 | 0.0120 | 0.50 |
| 4.5mm (3/16") | 0.177 | 4.5 | 0.059 | 1.5 | 0.0212 | 0.54 |
| 6mm (1/4") | 0.235 | 6.0 | 0.078 | 2.0 | 0.0232 | 0.59 |
| 9mm (3/8") | 0.354 | 9.0 | 0.118 | 3.0 | 0.0268 | 0.68 |
| 12mm (1/2") | 0.472 | 12.0 | 0.157 | 4.0 | 0.0268 | 0.68 |
| 18mm (3/4") | 0.708 | 18.8 | 0.236 | 6.0 | 0.0303 | 0.77 |
| 24mm (1") | 0.945 | 24.0 | 0.315 | 8.0 | 0.0354 | 0.90 |
| 38mm (1-1/2") | 1.496 | 38.0 | 0.512 | 13.0 | 0.0409 | 1.04 |
| PHYSICAL PROPERTY | TEST METHOD | TYPICAL VALUE |
| Tensile Strength (psi) | ASTM D 638 | 1500 min. |
| Elongation (%) | ASTM D 638 | 200 min. |
| Specific Gravity | ASTM D 792 | 1.35 max. |
| Low Temperature Flexibility -55°C | MIL-DTL-23053 | no cracking |
| Heat Shock 4 hours at 250°C | MIL-DTL-23053 | no cracking |
| Heat Resistance (175°C, 168 hrs.) Elongation (%) |
ASTM D638 | 100 min. |
| Secant Modulus (psi) | ASTM D 882 | 2.5 x 10,000 max. |
| Longitudinal Change (%) | MIL-DTL-23053 | +-5 |
| Electrical | ||
| Dielectric Strength | ASTM D 876 | 500 min. |
| Volume Resistivity | ASTM D 876 | 1.0 x 10,000 min. |
| Chemical | ||
| Corrosion (175°C, 16hrs) | MIL-DTL-23053 | no corrosion |
| Water Absorption (%) | ASTM D 570 | 0.5 max. |
| Fluid Resistance (23°C, 24 hrs.) Tensile Strength (psi) |
MIL-I-23053 | 1000 min. |
| Flammability | UL 224 VW-1 | pass |
| Shrink Temperature, Nominal | 90°C | |
| Application (Typical) | General Purpose Over Expanded |
|---|---|
| Recovery Temperature | 90°C |
| Flame Retardant | YES |
| Continuous Operating Temperature | -55° to 135°C |
| Flexibility | Excellent |
| Abrasion Resistance | Good |
| Solvent Resistance | Good |
| UL Rating & File No. (Subject 224) | 125°C, 600V VW-1 (Jacket only for dual wall) E48762 |
| UL Catalog No. | 826 Suffix 3X |
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.
| PART # | SIZE | COLORS | QTY DISCOUNT | QTY | PRICE per Foot | ||
| Before | After | ||||||
| HS3-0063FT | 1/16" | Black | 1 - 49 ft | $ 0.53 | per ft. | ||
| 50+ ft | |||||||
| HS3-0125FT | 1/8" | 1/24" | Black, Clear, Red, White, Yellow | 1 - 99 ft | $ 0.73 | per ft. | |
| 100+ ft | $ 0.47 | ||||||
| HS3-0188FT | 3/16" | 1/16" | Black, Clear, Red, White, Yellow | 1 - 49 ft | $ 0.94 | per ft. | |
| 50+ ft | $ 0.61 | ||||||
| HS3-025FT | 1/4" | 1/12" | Black, Clear, Red, White, Yellow | 1 - 49 ft | $ 1.12 | per ft. | |
| 50+ ft | $ 0.73 | ||||||
| HS3-0375FT | 3/8" | 1/8" | Black Temporarily Out of Stock, Clear, Red, White, Yellow | 1 - 49 ft | $ 1.40 | per ft. | |
| 50+ ft | $ 0.70 | ||||||
| HS3-0875FT | 7/8" | 7/24" | Black | 1 - 49 ft | $ 1.87 | per ft. | |
| 50+ ft | |||||||
| HS3-050FT | 1/2" | 1/6" | Black, Clear, Red, White, Yellow | 1 - 49 ft | $ 1.68 | per ft. | |
| 50+ ft | $ 1.10 | ||||||
| HS3-075FT | 3/4" | 1/4" | Black, Clear, Red, White, Yellow | 1 - 49 ft | $ 2.29 | per ft. | |
| 50+ ft | $ 1.49 | ||||||
| HS3-100FT | 1" | 1/3" | Black, Clear, Red, White, Yellow | 1 - 49 ft | $ 2.91 | per ft. | |
| 50+ ft | $ 1.89 | ||||||
| HS3-125FT | 1-1/4" | 5/8" | Black | 1 - 49 ft | $ 3.39 | per ft. | |
| 50+ ft | |||||||
| HS3-150FT | 1-1/2" | 1/2" | Black Temporarily Out of Stock, Clear, Red, White, Yellow | 1 - 49 ft | $ 4.91 | per ft. | |
| 50+ ft | $ 3.19 | ||||||
BULK SPOOLS
| PART # | SIZE | COLORS | SPOOL QTY | PRICE per Foot | |
| Before | After | ||||
| HS3-0125SP500 | 1/8" | 1/24" | Black, Clear, Red, White | 500 ft. | |
| HS3-0188SP250 | 3/16" | 1/16" | Black, Clear, Red, White, Yellow | 250 ft. | |
| HS3-025SP250 | 1/4" | 1/12" | Black, Clear, Red, White, Yellow | 250 ft. | |
| HS3-0375SP200 | 3/8" | 1/8" | Black, Clear, Red, White, Yellow | 200 ft. | |
| HS3-050SP200 | 1/2" | 1/6" | Black, Clear, Red, White, Yellow | 200 ft. | |
| HS3-075SP200 | 3/4" | 1/4" | Black, Clear, Red, White, Yellow | 200 ft. | |
| HS3-100SP100 | 1" | 1/3" | Black, Clear, Red, White, Yellow | 100 ft. | |
| HS3-150SP100 | 1-1/2" | 1/2" | Black Temporarily Out of Stock, Clear, Red, White | 100 ft. | |
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.
Select from the below list of available options to see it on the left.
NOTE: Due to differences in monitor settings, the examples show may vary slightly from the actual product.
NOTE: Not all options may be represented.
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.
| PART # | BEFORE SHRINKING | AFTER SHRINKING | COLOR | PRICE / FOOT |
| HS3A-0125FT | 1/8 in. | 0.04 in. | Clear, Black and Red | |
| HS3A-025FT | 1/4 in. | 0.08 in. | Black, Blue, Red, Yellow, Green, Clear | |
| HS3A-0375FT | 3/8 in. | 0.125 in. | Yellow, White, Black, Red, Clear, Blue | |
| HS3A-050FT | 1/2 in. | 0.167 in. | Yellow, Black, Red, Clear, Blue, Green | |
| HS3A-075FT | 3/4 in. | 0.250 in. | Yellow, Black, Red, Clear, Blue | |
| HS3A-100FT | 1 in. | 0.375 in. | Yellow, Black, Red, Clear | |
| HS3A-150FT | 1 1/2 in. | 0.500 in. | Black, Clear, Red |
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
| PART # | BEFORE SHRINKING | AFTER SHRINKING | LENGTH / PIECE | PIECES / PACK | COLOR | PRICE / PACK |
| HS3A-0125PCS-BK | 1/8 in. | 0.04 in. | 6 in. | 8 | Black | |
| HS3A-025PCS-BK | 1/4 in. | 0.08 in. | 6 in. | 8 | Black | |
| HS3A-0375PCS-BK | 3/8 in. | 0.125 in. | 6 in. | 6 | Black | |
| HS3A-050PCS-BK | 1/2 in. | 0.167 in. | 6 in. | 6 | Black | |
| HS3A-075PCS-BK | 3/4 in. | 0.250 in. | 6 in. | 4 | Black | |
| HS3A-100PCS-BK | 1 in. | 0.333 in. | 6 in. | 3 | Black | |
| HS3A-150PCS-BK | 1 1/2 in. | 0.500 in. | 6 in. | 2 | Black |
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.
| MATERIAL | ALTERNATE NAME | LOI | CATEGORY |
| ECTFE (Ethylene chlorotrifluoroethylene) | Halar | 64% | Self Extinguishing |
| Nomex | N/A | 28% | Slow Burning |
| Nylon 6:6 | N/A | Ranges fron 24-29% | Slow Burning to Self Extinguishing |
| PET (Polyethylene Terephthalate) | Mylar (film), Dacron (fiber) | Ranges from 21-34% | Slow Burning to Self Extinguishing |
| Polyethylene (PE) | N/A | 17% | Flammable |
| Polypropylene (PP) | polythene (in the UK) | 17% | Flammable |
| Polytetrafluoroethylene (PTFE) | Teflon | 95% | Self Extinguishing |
| Polyvinyl Chloride (PVC) | N/A | Ranges from 45-49% | Self Extinguishing |
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
REVIEWS
Reviewed by 2 customers
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Displaying reviews 1-2
Pros
Cons
Best Uses
Comments about 3:1 HEAT SHRINK 1/4 INCH:
I used it to bind together like cables in my home stereo install. I like the 3:1 shrink tubing because it can go over all but the largest of connectors and it shrinks enough to make a tight bundle. It shrinks evenly and works well.
- Primary use:
- Personal
Pros
- Durable
- Easy To Install
- Fits Multiple Cable Sizes
- Great Fit
- Great Protection
Cons
Best Uses
- Shoelace Aglet
Comments about 3:1 HEAT SHRINK 1/4 INCH:
It worked great!
- Primary use:
- Personal
Displaying reviews 1-2
 2:1 Heat Shrink Tubing KitPrice $10.99 2:1 Standard Wall From $0.50 per foot 2:1 Dual Wall Call for pricing Cheap 2:1 Heat Shrink From $11.00 for 50ft spool of 3/64" |
 3:1 Standard WallFrom $0.53 per foot 3:1 Adhesive From $1.17 per foot Cheap 3:1 Heat Shrink From $14.40 per spool |
 4:1 Standard WallFrom $2.75 per foot 4:1 Adhesive From $0.95 per foot Our 4:1 heat shrink tubing is used for jacket retrofitting or repair and electrical insulation of wire assemblies with oversize components or connectors. |
Standard 6:1 Heat Shrink |
2:1 Neoprene Heat Shrink Tubing 2:1 Diesel Resistant Heat Shrink Tubing |
 Heat Shrink UV ReactiveFrom $1.00 per foot It is available in a 2:1 shrink ratio and in Luminous, Neon Pink, Neon Yellow, Neon Green, Luminous Green, and Gold.
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 Heat Shrink End CapsFrom $0.70 Secure the ends of the tubing with these caps available in black in all three sizes.
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 Conductive Heat Shrink ConnectorsFrom $3.99 per foot They are entirely coated on their inner surface providing shielding around the joints being connected.
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 Heat Shrink Tools/ Heat GunsFrom $29.99 We offer a range of options to shrink your tubing, from small torches to ovens. |
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High Temperature (Fluoropolymer) Heat Shrink Tubing |
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 Fluorinated Ethylene-Propylene (FEP) Heat Shrink TubingFrom $2.34 per foot FEP is used in cases where temperatures are not as extreme, and very high shrink ratios are not necessary.
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 Polytetrafluoroethylene (PTFE)
Heat Shrink TubingFrom $4.86 per foot PTFE is widely used in military applications because of its high continuous use temperature and outstanding chemical resistance.
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 Polyvinylidene Fluoride (PVDF, Kynar®) Heat Shrink TubingFrom $5.49 per 4 FT PVDF is used in applications where continuous operating temperatures are 150-175°C. It is used where outstanding abrasion and cut-through resistance are required.
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PTFE/FEP Dual Wall Heat Shrink Tubing From $2.97 per FT Constructed with an outer layer of heat shrinkable PTFE and an inner layer of FEP, it is easy to apply & is designed to provide a tight, moisture-proof bond.
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Cheap 6:1 Heat Shrink