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Polytetrafluoroethylene (PTFE) Heat Shrink Tubing
"Absolutely solved my problem with protecting a connection in an area of high temp (300 deg F)"
PTFE Heat Shrink Tubing   |
What's special about this standard wall extruded PTFE Heat Shrink?
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- Continuous operating temperature -454°F to 500°F (-270°C to 260°C)
- Outstanding resistance to almost any chemical known (exceptions: alkali metals in molten state, fluorine gas at high temperatures, chlorine trifluoride)
- Chemically inert
- Biocompatible, TFE is certified FDA and USP Class VI for use in diagnostic, medical, and analytical applications consisting of heat shrink tubing
- Very low coefficient of friction
- Good dielectric strength
- Flame rating UL94 V0 and VW-1 (file E#64007/ CSA file # 02582)
- Limiting Oxygen Index greater than 95
- ETO and autoclave sterilizable
- ASTM D876 and ASTM D 1675 approved
- Mil spec approved AMS-DTL-23053/12
- MIL-STD-104 approved
- MIL-STD-2073-1: DOD material procedure for development and application of packaging requirements
- Tested by SAE for Aerospace Material Specifications
- Available color is Natural
PTFE heat shrink tubing is available in 2:1 and 4:1 shrink ratios, and is widely used in military applications (AMS-DTL-23053/12), industrial, biomedical, chemical and analytical sciences because of its high continuous use temperature (250°C), and outstanding chemical resistance.
PTFE heat shrink tubing is the most difficult of the three fluoropolymer materials to shrink due to its extremely high shrinking temperature (325-340°C). You can use a heat gun or welding torch to shrink TFE, but these methods have a tendency to cause the material to overheat in small areas, while under-heating other areas, causing uneven shrinking and potential burning of the material. The most reliable method for shrinking PTFE is the use of a controlled temperature oven; however this is impractical with large harnesses or temperature sensitive components.
A few notes on shrinking PTFE:
- Always assure good ventilation in the immediate work area prior to beginning the heat shrink process. Fumes may cause nausea and dizziness.
- It is imperative that the tubing be heated uniformly until it becomes clear (gel state). This transition from crystalline to amorphous must take place, since shrinkage will only occur during recovery from the gel state (re-crystallizing).
- When using a mandrel to shrink the tubing, it is important to pre-heat the mandrel to assure even and uniform shrinkage.
- If the tubing begins to crack, chances are you overheated the material.
- Also, higher shrink ratios will require higher shrink temperatures.
PTFE 2:1 and 4:1 Specifications
PTFE AMS-DTL-23053/12 Military Specifications
TFE Chemical Resistance Table
PTFE/TFE Resin Material Properties
RoHS Compliance 
PDF 234KB
UL Card 
PDF 44KB
2:1 Ratio
| STANDARD WALL | ||||
| Ordered as AWG Size No. | Expanded I.D. Min. | Recovered I.D. Max. | Recovered Wall Thickness | |
| Nom. | Tol. +/- | |||
| 1/8 | 0.215" | 0.130" | 0.020" | 0.004" |
| 1/4 | 0.410" | 0.260" | 0.020" | 0.004" |
| 5/16 | 0.470" | 0.329" | 0.020" | 0.004" |
| 3/8 | 0.560" | 0.399" | 0.025" | 0.006" |
| 7/16 | 0.655" | 0.462" | 0.025" | 0.006" |
| 1/2 | 0.750" | 0.524" | 0.025" | 0.006" |
| 5/8 | 0.930" | 0.655" | 0.025" | 0.006" |
| 3/4 | 1.125" | 0.786" | 0.030" | 0.008" |
| 7/8 | 1.310" | 0.911" | 0.030" | 0.008" |
| 1 | 1.500" | 1.036" | 0.030" | 0.008" |
* CUSTOM SPECIFICATIONS AND TOLERANCES UPON REQUEST
* AMS-DTL-23053/12
TW=AMS 3585
SW=AMS 3586
4:1 Ratio
| ORDERED AS I.D. (inches) |
EXPANDED I.D. MIN. (inches) |
RECOVERED-AFTER HEAT SHRINK | ||
| I.D. MAX. (inches) |
WALL THICKNESS (inches) |
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| NOM. | Tol.+/- | |||
| 5/64 | 0.078 | 0.025 | 0.009 | +/- 0.002 |
| 1/8 | 0.125 | 0.037 | 0.012 | +/- 0.002 |
| 3/16 | 0.187 | 0.050 | 0.012 | +/- 0.002 |
| 1/4 | 0.250 | 0.063 | 0.012 | +/- 0.002 |
| 5/16 | 0.312 | 0.078 | 0.012 | +/- 0.002 |
| 3/8 | 0.375 | 0.096 | 0.012 | +/- 0.002 |
| 7/16 | 0.438 | 0.112 | 0.012 | +/- 0.002 |
| 1/2 | 0.500 | 0.144 | 0.015 | +/- 0.004 |
| 9/16 | 0.562 | 0.155 | 0.015 | +/- 0.004 |
| 5/8 | 0.625 | 0.178 | 0.015 | +/- 0.004 |
| 11/16 | 0.687 | 0.198 | 0.015 | +/- 0.004 |
| 3/4 | 0.750 | 0.224 | 0.015 | +/- 0.004 |
| 7/8 | 0.875 | 0.244 | 0.015 | +/- 0.004 |
| 1 | 1.000 | 0.278 | 0.015 | +/- 0.004 |
| 1-1/4 | 1.250 | 0.347 | 0.015 | +/- 0.004 |
| 1-1/2 | 1.500 | 0.400 | 0.015 | +/- 0.004 |
| 1-3/4 | 1.750 | 0.450 | 0.015 | +/- 0.004 |
| 2 | 2.000 | 0.520 | 0.020 | +/- 0.005 |
| 2-1/4 | 2.250 | 0.585 | 0.020 | +/- 0.005 |
| 2-1/2 | 2.500 | 0.650 | 0.020 | +/- 0.005 |
| 2-3/4 | 2.750 | 0.710 | 0.020 | +/- 0.005 |
| 3 | 3.000 | 0.775 | 0.020 | +/- 0.005 |
| 3-1/4 | 3.250 | 0.835 | 0.020 | +/- 0.005 |
| 3-1/2 | 3.500 | 0.900 | 0.025 | +/- 0.005 |
| 3-3/4 | 3.750 | 0.960 | 0.025 | +/- 0.005 |
| 4 | 4.000 | 1.025 | 0.025 | +/- 0.005 |
Four foot sticks of heat shrink tubing are standard packaging lengths. Shorter pieces, longer pieces, or cut pieces to size are available upon request. Extremely long continuous lengths are sometimes available depending on specifications. Inquire for feasibility and pricing.
UL File #E64007 / CSA File #082582.
PTFE heat shrink tubing is available in a 2:1 shrink ratio and 4:1.
The 2:1 is available in up to four different wall thicknesses.
Please note: when ordering our 2:1 PTFE Heat shrink, ORDER AS SIZE AFTER SHRINKING.
PTFE 2:1 Standard Wall Heat Shrink
Standard lead time is 3-4 weeks. Please call for immediate availability
*4 ft sections are the maximum on dual wall and specialty tubing
| PART # | EXPANDED I.D. (MIN) | SIZE AFTER SHRINKING | RECOVERED WALL THICKNESS |
PRICE / FT |
| HSPTFE2-0125-FT | 0.215" | 0.13" | 0.022" | $4.14 |
| HSPTFE2-025-FT | 0.410" | 0.26" | 0.020" | $6.32 |
| HSPTFE2-0313-FT | 0.470" | 0.33" | 0.020" | $7.55 |
| HSPTFE2-0375-FT | 0.560" | 0.40" | 0.025" | $12.78 |
| HSPTFE2-0438-FT | 0.655" | 0.46" | 0.025" | $14.00 |
| HSPTFE2-050-FT | 0.750" | 0.52" | 0.025" | $15.86 |
| HSPTFE2-0625-FT | 0.930" | 0.66" | 0.030" | $22.79 |
| HSPTFE2-0875-FT | 1.310" | 0.91" | 0.035" | $38.10 |
| HSPTFE2-100-FT | 1.500" | 1.04" | 0.035" | $43.82 |
| PTFE 2:1 - Technical Specifications, click here Dual Wall PTFE |
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PTFE 4:1 Heat Shrink
Standard lead time is 1 week. Please call for immediate availability
*4 ft sections are the maximum on dual wall and specialty tubing
| PART # | NOMINAL SIZE | SIZE AFTER SHRINKING | PRICE / FT |
| HSPTFE4-0125-FT | 1/8" | 0.037" | $1.73 |
| HSPTFE4-025-FT | 1/4" | 0.063" | $2.25 |
| HSPTFE4-0313-FT | 5/16" | 0.078" | $2.30 |
| HSPTFE4-0375-FT | 3/8" | 0.096" | $2.58 |
| HSPTFE4-0438-FT | 7/16" | 0.112" | $3.47 |
| HSPTFE4-050-FT | 1/2" | 0.144" | $4.26 |
| HSPTFE4-0625-FT | 5/8" | 0.178" | $5.35 |
| HSPTFE4-075-FT | 3/4" | 0.224" | $7.05 |
| HSPTFE4-0875-FT | 7/8" | 0.244" | $8.00 |
| HSPTFE4-100-FT | 1" | 0.278" | $8.37 |
| HSPTFE4-150-FT | 1-1/2" | 0.400" | $18.19 |
| HSPTFE4-200-FT | 2" | 0.520" | $23.44 |
| HSPTFE4-250-FT | 2-1/2" | 0.650" | $48.38 |
| HSPTFE4-300-FT | 3" | 0.775" | $70.64 100 FT minimum |
| HSPTFE4-400-FT | 4" | 1.025" | $106.32 |
| PTFE 4:1 - Technical Specifications, click here Dual Wall PTFE |
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Custom Sizes and Cut Pieces are NON-RETURNABLE and NON-REFUNDABLE
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 |
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?
CATALOG - PDF
For your convenience, we have made our brochure and catalogs available online in PDF format. Downloading the PDF catalog will take you no more than 5 minutes, so you won’t have to wait days for the print catalog. PDF catalogs include links to our products: just click on the hyperlinked product headings, and you’ll be directed right to our website.
Automotive 
PDF Catalog 2.6 MB
Aerospace/Aircraft PDF Catalog 2 MB
Utilities & Energy PDF Catalog 3.7 MB
 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 per spool |
 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 |
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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 $1.99 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 $4.14 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 Tubing From $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 $2.26 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
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