High Temperature and Chemical Resistant

High Temperature and Chemical Resistant
The chemical and heat-resistant heavy-hitters of heat shrink tubing

Sometimes, you need heat shrink tubing that can handle extreme conditions, like high or low temperatures, caustic chemicals, UV or gamma radiation or more. That's where these heavy-duty types of high temperature fluoropolymer heat shrink tubing come in.

HIgh Temperature Heat Shrink Tubing Types:

Kynar

Polyvinylidene fluoride is also known as PVDF, or by the tradename Kynar. We offer both flexible PVDF and semi-rigid Kynar heat shrink tubing with the following specs:

  • Continuous operating temperatures of 302°F (150°C) for flexible or 347°F (175°C) for semi-rigid
  • Ultraviolet (UV) and gamma ray stable
  • Superior resistance to chemicals and aging
  • Flame rated UL94V0 and VW-1
  • Material rated for plenum use

Teflon®

Polytetrafluoroethylene (PTFE) is better known under the brand name Teflon®, so you may think of it as something that keeps your omelet from sticking to the frying pan, but it has so many more uses than that. PTFE heat shrink is usable over a wide range of temperatures, although its one drawback is its extremely high shrink temperature, which can only be achieved with a torch. It is also available adhesive-lined.

  • Continuous operating temperature range of -454°F to 500°F (-270°C to 260°C)
  • Resistant to almost any chemicals, except alkali metals in molten state, fluorine gas at high temperatures, and chlorine trifluoride
  • Flame rated UL94V0 and VW-1
  • Extremely flame resistant, with a Limiting Oxygen Index (LOI) >95%
  • Shrink temp is 617°F to 644°F (325°C to 340°C)

FEP

Confusingly, fluorinated ethylene propylene (FEP) was originally also marketed as Teflon®, since the two materials are very similar, although FEP has a lower melting point, so is not used in cooking utensils. Its uses include guidewire jacketing, coating surgical instruments, dielectric insulation, component covering, waterproofing, abrasion/corrosion protection, reflow bonding, and encapsulation. Its specs are

  • Operating temp, -88°F to 392°F (-67°C to 200°C)
  • Shrink temp 212°F (100°C)
  • Available in 1.3:1 and 1.6:1 shrink ratios, but can also shrink up to 15% in length

Neoprene

Also known as polychloroprene, this type of heat shrink tubing is resistant to fluids, solvents, and abrasion, with outstanding low temperature flexibility. This is the same material used in things like wetsuits. Specs:

  • 2:1 shrink ratio
  • Operating Temperature: -103°F to 248°F (-75°C to 120°C)
  • Shrink Temperature: 275°F (135°C)

Diesel resistant heat shrink tubing

Resists fuels including diesel, with a wide range of operating temperatures. Specs:
  • Operating Temperature: -94°F to 302 (-70°C to 150°C)
  • Shrink temperature: 347°F (175° C)
  • Shrink ratio: 2 to 1.

Viton

Fluoroelastomer, known by the trade name Viton, protects against aggressive chemicals in high temperature environments but also remains flexible at low temperatures.

A: There are heat guns and torches that put out sufficient heat to do the job, but the important part with PTFE is that everything is heated evenly and, in the case of underlying parts with large diameters, including mandrels, that you pre-heat these before placing the shrink tubing.

Using an oven to heat the heat shrink tubing is ideal, as the heat distribution will be even, but if that's not possible, you have to make sure that you heat everything uniformly and that there is sufficient circulation so that everything cools at the same rate as well. Also, if possible, rotate the object to ensure even distribution of heat.

You need to heat PTFE until it reaches its translucent gel phase, at which point the crystal structure maintaining its expanded size will have melted, allowing it to shrink to its final size. Also note: When heat shrinking PTFE, make sure there is sufficient ventilation in the area, as its fumes can cause nausea or dizziness.

A: High Temperature and Chemical Resistant Heat Shrink Tubing types all offer a range of high and low temperature flexibility as well as caustic chemical and UV rays resistance. PTFE provides the most flexibility with a continuous operating temperature range of -270°C to 260°C.

A: They are the technical terms for the type of polymer structure that a particular type of heat shrink tubing is made of. While they may seem intimidating or scary, they're basically straightforward.

The prefix "poly-" in a lot of them just indicates a lot of a particular kind of molecule chained together — poly means "many." In general, those molecules are made of carbon and hydrogen, which are two of the most common and harmless elements in the universe. For most of the heat shrink tubing above, the extra element is fluorine,

While its natural state is as a pale yellow-green gas that is highly reactive, because of its reactivity it does not occur in its elemental state in nature. It is also a poor conductor of heat or electricity, which makes it a good insulator.

This is why it's common in high-temperature heat shrink applications. It bonds so aggressively with other elements that the bond is very difficult to break through things like heat or oxidation.