Polytetrafluoroethylene (PTFE) Heat Shrink Tubing

Description of Polytetrafluoroethylene (PTFE) Heat Shrink Tubing

Part #: PTFE

Whether you are working on a complex application or a simple solution, you can rely on PTFE heat shrink which has been designed into products like advanced medical devices and high temperature industrial equipment.

Polytetrafluoroethylene heat shrink tubing has the lowest coefficient of friction any polymer has ever seen and offers a wide working temperature range. Used in the chemical and analytical sciences industries because of its high chemical resistance and unparalleled chemical inertness, PTFE has become the plastic of choice.

*Sold by the Foot.

*Maximum 4 Ft continuous length for this product.

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Features and Benefits

Ideal for military applications, able to withstand high continuous temperature range from -454°F to 500°F (-270°C to 260°C)
Offers high chemical resistance and reduced friction rating
Adheres to MIL-I-23053/12 specifications and flame rating for both UL940 and VW-1
Resistant to aggressive chemicals except alkali metals in molten state, fluorine gas at high temperatures and chlorine triflouride
Good dielectric strength for durability and insulation
Comes in Natural color for visibility
Very Lubricious with a low coefficient of friction
Available in 2:1 shrink ratio and 4:1 shrink ratio
Cleans with ease
Works well under severe conditions
Approved for both FDA and USP Class VI
Has a limiting oxygen index greater than 95
ETO and autoclave sterilizable

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Specifications

More Info

Property	ASTM	Typical Value
Tensile Strength	D638	2500 psi (17,3 Mpa) 2 inches/mm
Specific Gravity	D792	2.2
Elongation	D2671	200%, 2 inches/mm
Longitudinal Change	-	20%
Water Absorption	D570	<0.01%
Fungus Resistance	-	No growth
Corrosion	-	Non corrosive
Fluid resistance	-	No change
Dielectric Strength Volts/mil (Kv/mm) Mininum	D2671	800 (31,1)
Volume Resistivity	D876	>10¹⁸ohm-cm
Voltage Withstand	-	Pass (350° ± 4°C, 662° ± 7.2F), 5 mn
Continuous Service Temperature	-	-88°F (-67°C) to +482° F (+250°C)
Storage Temperature	-	18° to 35°C(65° to 95°F) for 4 years
Melting Point	-	+635 to +650°F
Heat Shock	-	No cracks, flowing or dripping (400° ± 5°C, 752° ± 9°F
Restricted Shrinkage	-	Pass (350° ± 4°C, 662° ± 7.2°F), 5 mn
Low Temperature Flexibility	-	No cracking (-65° ± 2°C, -85° ± 4°F)
Flammability	-	Non Flammable
Flammability Rating	UL94	V0

PTFE heat shrink tubing is part of the fluoropolymer material family and is very difficult to shrink due to high shrink temperature at 325 – 340’C. If using a heat gun or welding torch to shrink the heat shrink, the material can overheat in some areas and under-heat in others which can cause uneven shrinking and possibly burning of the material. If you are looking for a reliable way to shrink PTFE, use a controlled temperature oven however, when attached to large harnesses or temperature sensitive components, this can be difficult.

PTFE heat shrink comes in 2:1 and 4:1 shrink ratios – often used in military applications due to its adherence to MIL spec MIL-I-23053/12 and because it has a high continuous use temperature of 250’C and strong chemical resistance.

When shrinking PTFE, make sure you have good ventilation in your area of work – this is in order to ensure human safety as fumes may cause nausea and/or dizziness. The tubing has to be heated uniformly until it becomes clear in color – this is what is known as the gel state – be sure to preheat the controlled temperature oven before shrinking to ensure uniform shrinkage. Cracked PTFE suggests that the material has been overheated.

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