Fits Like a Glove: Buying the Right Size Heat Shrink Tubing

May 15, 2018 by  
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PTFE Heat Shrink Tubing Products / PTFE Heat Shrinkable Tubing

Imagine if buying a heat shrink tubing was as simple as buying a coat. You measure the object you want to cover and then buy a heat shrink to fit.

Unfortunately, it’s not.

Buying a right size heat shrink is much more complex than buying a right size coat. Because the tubing shrinks, when heated, does not retain the same dimensions it originally has pre-heating.

As such, it’s common for buyers (especially, first time buyers) to make sizing mistakes when buying a heat shrink tubing, ending up with a purchase that just won’t fit into their application.

This piece will guide you on how to avoid sizing mistakes and buy a right sized heat shrink tubing for your application.

First things first…

Before we get into the nitty gritty of how to measure a heat shrink when purchasing one, it’s worth noting that heat shrink tubing is first made to the diameter it will be when it’s shrunk. After that, it is expanded and packaged for sale.

So when you buy a heat shrink tubing, its shrunk dimensions are already known; they’re stated on the specification sheet.

Having this explained, we can now move on to the actual measuring step.

Dimensions and Dimension Facts—You Should Know About!

When measuring a heat shrink tubing, there’re basically two types of dimensions you’ll be working with: i) Recovered dimensions and, ii) Expanded dimensions.

Recovered dimensions are the shrunken dimensions and expanded dimensions are the dimensions of the tubing in the stretched form.

On a typical heat shrink datasheet, you’ll find the following dimensions listed:

  • Recovered internal diameter
  • Recovered wall thickness
  • Expanded internal diameter

Let’s say you want to buy a heat shrink to cover a cable which has an outer diameter of 7 mm.

The heat shrink that you buy must have:

  • An expanded internal diameter greater than 7 mm
  • A recovered internal diameter of just under 7 mm

Please note that you won’t find the exact dimensions listed on a heat shrink tubing’s datasheet. They will always have some tolerance range which will be mentioned on the sheet. So make sure you keep that in mind.

What about the wall thickness?

It depends on the application in which you want to use the heat shrink. If wall thickness is really important for your application (for e.g. If you’re looking to insulate a piece of wire), we would recommend that you purchase a heat shrink tubing with the maximum recovered wall thickness.

Let’s take a look at another example.

Let’s say you want to buy a heat shrink tubing to insulate a cable wiring. The cable has a diameter of 7 mm. It has bare wires running through it which are 4 mm in diameter. Plus, the cable has a connector at each of its end, which has a diameter of 15 mm.

The heat shrink that you buy must have:

  • An expanded internal diameter greater than 15 mm
  • A recovered internal diameter of just under 4 mm

For wall thickness the rule is same as discussed above.

One more thing you should keep in mind…

A heat shrink tubing not only shrinks in diameter when heated, but it also shrinks in length. Although the change in length is minimal, usually 10% of the original expanded length. So if you need a heat shrink tubing to cover an object of length 2 meters, you should buy a heat shrink which is at least 2.2 meters long. You can later cut off the tailing end if you wish to.

And that is how you can buy the right size shrink tubing for your application that will fit like a glove.

A BONUS read: The Chemistry Behind the Working of Heat Shrink

All You Need To Know About Heat Shrinkable Probe Covers

October 30, 2017 by  
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Regardless of whether you are an engineer or an electrician, you must already be familiar with the term “heat shrink tubing” and ” Probe Covers “. In fact, there is also a high possibility that you’ve come in contact with them and know how they work.

Initially, heat shrinkable tubes were used to safeguard electrical wires only. But, over time, their efficacy extended to a wide spectrum of industrial and commercial applications. A number of industries now rely on PFA tubing to prevent fire and lessen energy dissipation, and in the process, cut their manufacturing costs.

Read on if you are interested in getting to know more about the benefits of heat shrink tubing.

1.      They can resist high temperatures.

Heat shrink tubes can withstand extreme temperatures and hence, can work under harsh chemical conditions which can melt other lesser materials. With a melting point as high 320°C and a freezing point as low as –268.15°C, these tubes are able towithstandall freezing cold and blistering hot chemical environments.

2.      They can withstand abrasion.

Fortunately, heat shrink tubes are added to industrial products so as to enhance their resistance to accidental damages and physical abuse.

3.      Their end caps protect the product.

Assuming that you are connected to the field of science in one way or another, it’s understood that cutting a wire to resize or rework its shape according to the “electrical need” is something you’ve done time and time again.

This goes without saying that if you fail to insulate the wire properly, the cut can cause trouble.

Thankfully, with encapsulating heat shrink tubes, you need no longer worry about overheating or shorting of circuits. Considering safety is your topmost priority, heat shrink tubing offers high performance with utmost protection.


Heat Shrinkable FEP & PFA Probe Covers

Probe covers serve as an end cap plug for the expensive glass or metallic probes used in high-temperature or corrosive processes.

Since these parts are placed in hard-to-access positions in a circuit, and reside in a gas or liquid stream, encapsulating them with heat-shrinkable FEP or PFA covers increases their longevity.

This is mainly because of the chemical inertness and excellent lubricating, and high electrical and thermal resistance properties that these fluoropolymer tubes have to offer.

The FEP and PFA probe covers engineered at Tef-Cap Industries act as protective shields  for a number of industrial products such as probes, thermocouples, resistance temperature detectors (RTDs), thermometers and assorted sensors. In corrosive environments, these probe covers create an impenetrable barrier between the caustic chemicals and expensive sensing devices.


Interested in getting your instruments encapsulated by Tef-Cap’s heat shrinkable probe covers? Get in touch with us now: 610-692-2576.

Here Are 6 Common Myths about Teflon

March 6, 2017 by  
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Teflon, a brand name for polymer PTFE (Polytetrafluoroethylene), was discovered by a young researcher named Dr. Roy Plunkett at the DuPont research laboratories in the April of 1938.

The discovery was an accidental one as Plunkett was experimenting with tetrafluoroethylene to produce CFCs (Chlorofluorocarbons). He found that the cylinder that initially had 1,000 grams of the gas had 10 grams missing when it was released. He finally discovered that the molecules of the gas strings with carbon atoms attached to fluorine atoms formed a unique polymer.

From food processing to industrial coatings, Teflon has been used for a variety of purposes since its discovery. However, there have been some myths about the polymer. Let’s have a look:

Myth #1: Using Nonstick Teflon Coating Is Not Safe

Truth: There have been various concerns regarding the safety of using polymer coated non-stick pans. The truth is that cooking food in these products is absolutely safe. Not only that, it can also contribute towards a healthy heart by letting people cook with little or no fat.

Myth #2: Nonstick Coatings Tend to Wear Off Easily

Truth: This misconception has absolutely no factual basis. In fact, modern PTFE coated frying pans are designed to last a lifetime.

From resisting chipping to preventing flaking, these products have outstanding durability features.

Myth #3: Teflon and PFOA Are the Same

Truth: PFOA, or Perfluorooctanoic, is often confused with Teflon.

Teflon is a brand for nonstick coatings for cookware and bakeware items. PFOA is a man-made chemical used in the manufacturing of Teflon, but is burned off in the process. However, the production of these nonstick pan items does not include PFOA.

Myth #4: All Nonstick Coatings Perform Similarly

Truth: When users hear the term nonstick, they generally think that these products are same. However, there is a vast difference. Teflon easily outperforms its counterparts, such as ceramic pans and green pans, in virtually all aspects.

Myth #5: Scratching Means End of Life for Teflon

Truth: With Teflon nonstick cookware, scratching does not seem to make much of a difference. As long as the coating is intact, anything can be cooked without worries.

Myth #6: High Levels of Heat Will Have Negative Effects on Teflon

Truth: Teflon frying pans have been specifically designed to stand massive levels of heat. There will be no damage to the finishing of the cookware for heat levels up to 500 degrees Fahrenheit.

With over 50 years of experience in the field, we at Tef-Cap specialize in heat shrinkable Teflon tubes. We also produce FEP tubing, Polyolefin heat shrink tubing and heat shrink caps among others.

FEP Tubing – Benefits, Features and Applications

February 28, 2017 by  
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As far as the field of chemical engineering and material science is concerned, the discovery of FEP tubing was an incredible leap forward. It was the need of a more processable material that prompted engineers to explore more options and finally led to FEP’s discovery.

Technically, FEP is a copolymer of hexafluoropropylene and tetrafluoroethylene, with most properties of PTFE (Polytetrafluoroethylene). FEP is more flexible and offers lower heat shrink temperatures than PTFE.

It is produced by traditional processing techniques, such as injection molding, extrusion and film casting.

Benefits and Features of FEP Tubing

FEP film is a transparent thermoplastic film that can be heat sealed, heat bonded, thermoformed, welded and laminated with other materials.

All of the above fabrication properties combine with the following features and benefits to provided incredible manufacturing capabilities:

Incredible Chemical Compatibility

FEP film is inert and provides incredible resistance for all kinds of chemicals, except alkali metals, gaseous fluorine, and some complex halogenated compounds. It also provides low permeability when dealing with different types of compounds.

Superior Electrical Efficiency

FEP retains electrical properties over large areas of film. With a dielectric strength of over 6,500 V/mil, the tubing solution ensures that there is no electrical tracking or wetting.

Excellent Thermal Range

FEP works efficiently at temperatures in the range of -240 degrees Celsius to 205 degrees Celsius. Moreover, it is also heat sealable.

Outstanding Mechanical Toughness

With incredibly low frictional properties, FEP provides anti-stick capabilities. It is also highly resistant to impact and tearing, which makes it one of the most suitable chemical manufacturing materials.

Strong Weatherability

FEP offers strength and is inert to outdoor exposure. Equipment manufactured from FEP tubing demonstrates no measurable changes even after 20 years. It also has amazing UV transmission ratings.

Some Applications

Generally, FEP tubing is used where superior chemical resistance is required or where working at extremely lower temperatures is desired. From manufacturing environmental monitoring equipment to producing medical equipment, FEP tubing can be used for a variety of purposes.

Since FEP is resistant to many industrial solvents, acids and bases, it has many applications. Some of them include:

  • FEP tubing can be used for sterile filling and dispensing systems.
  • It can be used to make diagnostic equipment.
  • It can be employed in cell and tissue culture technology.
  • It can be used to design and process equipment in fields, such as biotechnology and pharmaceutical.

With a team of highly effective chemical engineers and production managers, we at Tef-Cap specialize in manufacturing and supplying FEP heat shrink tubing solutions. Over the years, we have helped businesses thrive through our affordable and effective solutions.

Some Applications of PTFE Coating in the Aviation Industry

February 8, 2017 by  
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PTFE (Polytetrafluoroethylene) coating is one of the most common types of industrial coating. From chemical processing to electrical insulation, the fluoroplastic material has got a variety of applications.

History of PTFE

Experimenting on materials to be used as refrigerants, Roy Plunkett stumbled upon this discovery in 1938. While measuring the amount of gas in the bottle, he began to explore what accounted for the weight when the bottle was empty. Inside the bottle’s interiors, he finally found a waxy white material that was then named Polytetrafluoroethylene.

It did not take long for the discoverer to convert this material into blocks. Later on, these blocks were turned into molds to produce various shapes. Finally, with aqueous dispersion and powder grades, this material began to be used as a coating substance in a wide variety of industries.  

Application in Aviation Industry

PTFE is incredible for the aviation industry because of its unique properties such as low co-efficient of friction, low dielectric constant, and inflammability.

Another quality that makes PTFE coating vital for aviation industry is its temperature resistance. It has the ability to retain physical properties at temperatures between -195 degrees Celsius to +260 degrees Celsius. Here are some examples of PTFE coating at work in the aerospace industry:

Aircraft Wings

PTFE is an essential material that is used frequently in airplane’s components. For instance, it is used in the production of leading edges of the wings of an airplane—the flaps that are responsible for slowing it down during landing.

This is made possible by the low co-efficient of friction of the material. Moreover, PTFE coating ensures that the aluminum rod is adequately shielded, minimizing the effect that increased vibration could have caused.

Electrical Connectors

Owing to the importance of plug and play in the air, electrical connectors have become a sort of necessity. They need extremely low abrasion resistance values, which is provided by PTFE coating.

Fuel Systems

Another application of PTFE coating in the aerospace industry is fuel systems. It is applied in both inline and refueling parts to ensure that everything remains safe and sound when the plane is in the air.

Some of the other applications of PTFE coating in aircrafts include:

  • Air bearings
  • Electric harness parts
  • Control surfaces
  • Electronic device trays
  • Tank fuel seals
  • Throttle box seals
  • Arming components

Tef-Cap manufactures and provides a complete line of PTFE tubing solutions including PTFE heat shrink tubing, spiral wrap PTFE tubing, convoluted PTFE tubing, and extruded PTFE tubing. Contact us to know about our products.

Exploring Heat Shrinkable Teflon Tubing Options

January 3, 2017 by  
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When you look at heat shrink tubing, it seems just like any other type of polymer tubing. It’s flexible and seems simple to use.

However, what you don’t know (or maybe you do) is the amount of engineering and chemistry that goes in to creating heat shrink tubing. From the final application to the nature of exposure, every little detail plays a key role in determining important steps during the manufacturing process.

From the ability to display exceptional resistance against temperature rises to offering a wide variety of colors, heat shrinkable Teflon tubing is preferred for its highly useful characteristics.

The shrinkable tube is used to insulate wires while providing abrasion resistance protection against moisture. Almost all sorts of joints and cables across a wide range of electrical applications can be safeguarded using the right type of heat shrinkable Teflon tubing.

If you are planning to explore our collection of heat shrinkable Teflon tubing, here are a few options you should be aware of:

FEP (Fluorinated Ethylene Propylene) Heat Shrink Tubing

If you are looking for heat shrink tubing that is relatively easier to shrink, you need FEP heat shrink tubing. FEP heat shrink tubing has a maximum temperature range of about 400 degree Fahrenheit and has exceptional heat resistance. The superior dielectric strength also makes it perfect across a wide range of industrial applications.

PTFE (Polytetrafluoroethylene) Heat Shrink Tubing

PTFE heat shrink tubing is used across applications that require exposure to a higher degree of heat. This makes it perfect for use in automotive applications where engine rooms are subjected to higher temperatures. Other highlighting properties of PTFE heat shrink tubing include the material’s ability to self-lubricate and resist exposure to water.

PFA (Perfluoroalkoxy Alkanes) Heat Shrink Tubing

Heat shrink PFA probe covers are some of the most popular products in our heat shrink tubing collection. The probe covers can be easily slipped over standard probes. What makes them special is that they are chemically inert and FDA compliant, which means they can be used across pharmaceutical and food and beverage industries.

Heat shrink probe covers can perform in temperature ranges of up to 500 degree Fahrenheit.

Whether used by individuals for DIY projects, or across heavy duty industrial applications, heat shrink tubing continues to reveal a never ending array of possible applications. As engineers, electricians and other professionals continue to discover and implement the uses of heat shrink tubing, the popularity of this specific product is growing.

At Tef-Cap, we supply a wide range of heat shrink tubing to a diverse array of clients across different industries. Whether you are looking for adhesive lined heat shrink tubing or heat shrink caps, get in touch with us to find out how we can help you secure the products you need!

Understanding Process Parameters And Their Impact On PTFE Tubing

December 8, 2016 by  
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One of the most difficult procedures within the polymer space remains to be PTFE tubing extrusion. All sorts of polymers have specific characteristics that play an important role in their processing. But PTFE comes with such a diverse array of process parameters; identifying the right combination that works coherently is not something every manufacturer is able to achieve.

Even after years of research, with PTFE tubing new process parameters may show up any time. Let’s take a look at some of the most common parameters and how they affect the final product here:

Handling Resin

It may perhaps be one of the most easily overlooked aspects of the process. Even though many manufacturers lay out specific guidelines for restricting the shear before processing the resin, these limitations become even more important when tubing is concerned.

The fibrils that are formed during extrusion are of utmost importance when it comes to the strength of the final tubing product.

Excessive shearing often leads to poorly formed fibrils which mean a dramatic drop in quality of the final tubing product.

Blending Resin

When blending, the surface tension of the extrusion aid should be less than that of PTFE while not having flash point or volatility enough to raise concerns.

The blending process also includes considering the RPM implemented in the process and post blending storage. Unless the blending is done perfectly, the final product will be either too dry or too soft. The density of the product may also be largely impacted by irregularities in the blending process.


Pre-forming gives the resin its shape and it helps avoid formation of air pockets. The process should be performed keeping in mind lack of adequate pressure could make it impossible to vent out all the air from the product. Even the tiniest of air pockets could render the tube useless by bursting during extrusion. On the other hand, excessive pressure could squeeze out the extrusion aid, making the extrude dry.


Even though the previous steps have already given the tube much of its characteristics, extrusion gives the product its final shape. The process needs to maintain the right pressure on the billet while ensuring the concentricity of the final PTFE tubing.

If the pressure is on the either extremes, it will result in failure to form the product or it may exert too much shear. The concentricity is dependent on the density of the billet and the tooling present within the extruder.


When it comes to heating, the temperature of heat applied should account for sintering as well as drying. Drying should be able to evaporate all vapors from the tube without igniting them. During sintering the temperature should be controlled to minimize chances of over sintering. Even though PTFE doesn’t melt, during sintering it may elongate under its own weight. PTFE should be in gel-like state before it leaves the chamber so it can cool down normally.

Apart from all these processes, PTFE also goes through pigmentation, extrusion of specific profiles and the addition of anti-static fillers. Each part of the process plays a key role in giving PTFE tubing its final form and characteristics.

At Tef-Cap, we make sure that all our PTFE tubing products undergo rigorous quality checks before they make it to clients. Get in touch with us to learn more about our PTFE products today.

Upgrading To PTFE Heat Shrink Tubing

November 7, 2016 by  
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Polytetrafluoroethylene (PTFE) tubing is one of the most popular Teflon fluoropolymer tubing options. It is an original, so-called gold standard, first invented in 1940s.

In contrast to the material’s popularity today, it was difficult to process PTFE a few decades ago. However, today it has become a reference material for chemical resistant industrial tubing.

Its wide scale usage in several industrial applications is attributed to unique properties of PTFE material. From high temperature applications to protection in corrosive environment, PTFE Teflon tubing is used in almost all industries.

If you’re thinking about upgrading older tubing with PTFE, this short guide will help you in making the right decision.

Why upgrade to PTFE tubing?

As mentioned above, PTFE tubing is widely used in industry. Its physical strength and resistance to harsh environment is one of the reasons why it is preferred for most applications. A list of most common industries which use PTFE tubing includes:

  • General and heavy industry
  • Aerospace
  • Environmental
  • Scientific labs
  • Automotive
  • Emerging technologies including energy sector (wind, solar etc.)

Properties and applications

PTFE is considered a gold standard in Teflon tubing. Most significant properties and applications of PTFE tubing in these industries are discussed here:

  • These are used as electrical wire insulators because of its high dielectric strength (2.1) over a range of temperature between -40°F and 480° This is especially true when protection against corrosive environments and high temperatures is required.
  • These tubes also have the lowest coefficient of friction among all other fluoropolymer tubing options. This makes it an ideal material for applications requiring slippery material for reducing friction. It’s therefore often used in fluid flow tubing.
  • This material is also resistant to common acids and solvents; almost 100% chemically inert. This quality allows it to be used in medical devices.
  • Finally, the material can withstand a temperature as high as 500°F and cryogenic conditions as low as -320°

PTFE Heat Shrink Tubing

The heat shrink option offers easy installation for various applications. At Tef-Cap, we provide AWG heat shrinkable tubes in three different wall thicknesses; standard, thin, and light walled options.

Our PTFE tubes have a flame rating of UL94 VO and WV-1. This makes them ideal for moisture sealing, terminating, insulating, splicing and electrical applications.

We also offer color coded options for applications and instrumentations requiring such coverings. Check out our PTFE tubing options and contact today for orders and more information.

Difference Between PFA And PTFE Tubing

October 7, 2016 by  
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Take a trip down the street and ask someone if they know what fluoropolymers are. Ignore the look they give you and then ask again if they now what Teflon is. You’ll most probably get an answer this time.

Teflon is renowned for being used in frying pans to give them the ‘non-stick’ character. But most people are unaware that it is a fluoropolymer. There are other fluoropolymers widely used in various industries.

The two most common fluoropolymers are Perfluoroalkoxy (PFA) and polytetrafluoroethylene (PTFE). The same class of polymers, they have a number of similar properties. However, there are a few differences too.

These differences are the deciding factor of what material is used for which application.

Physical and chemical properties

One of the major differences between these two types of Teflon materials is that PFA is melt processable while PTFE isn’t. This is done through either screw extrusion techniques or conventional injection molding.

On the other hand, PTFE has a high molecular weight and is comprised mainly of carbon and fluorine. As a fluorocarbon solid, PTFE is hydrophobic and thus can get wet if exposed to water or water containing substances. It also has a low coefficient of friction and high electronegativity.


PFA is often used for laboratory equipment because of its resistance to most chemicals. It also has a high optical transparency and flexibility making it suitable for laboratory plastic.

PFA tubing is also used for handling critical or corrosive processes. These are also used as sheet linings for chemical equipment.

PTFE is the popular non-stick covering of frying pans and other kitchen ware. It is also used in pipes and containers for handling corrosive and reactive materials. It is sometimes used as a lubricant to reduce friction in machinery, minimize friction-related damage and improve energy consumption.

Flexibility, resistance and electrical properties

PFA is more flexible than PTFE tubing; however, it has lower flex life (ability to endure repetitive folding) than PTFE.

PTFE is a bit more resistant to heat. It is also less affected by water absorption and weathering. However, PFA is more resistant to salt spray. While both PFA and PTFE have almost the same dielectric constant and dissipation factor, the dielectric strength of PFA is almost four times higher than PTFE.

Our products

Teflon is one of the best inventions of the last century.  PFA  can also be used for probe covers. We have several heat-shrink, smoothbore and flexible Teflon tubing options.

All About Heat Shrink Tubing

October 4, 2016 by  
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Heat shrink tubing is used to insulate wires for wire conductors, joints, connections and terminals of any electrical work. Their main purpose is to protect cables against abrasives and other environmental factors.

Apart from protection, heat shrink tubing is also used to join wires together, create seals for cable entry and repair insulation. Heat shrink tubing are more reliable and long lasting, thus preferred in multiple industries. Here are a few basics!

Types and manufacturing material of heat shrink tubing

The shrinking quality of these tubes is because of their manufacturing material. These are made from thermoplastics, including polyolefin and fluoropolymer. Different material may be chosen for different applications.

1.      Fluoropolymer tubing

These can be FEP, PFA, PVDF or heat shrink PTFE tubing.

Polytetrafluoroethylene (PTFE) heat shrink tubes have a wide temperature range, from -55 °C to 175 °C. With a low coefficient of friction and high resistance to both chemicals and punctures, PTFE tubes are widely used in industry.

Fluorinated ethylene propylene (FEP) tubes provide a low-cost alternative to PTFE. FEP is an electrical conductor, inert to most solvents and chemicals. It is also highly resistant to extreme cold, heat and ultraviolet (UV) radiations. Hence, it is an excellent choice for most applications.

Manufactured from Polyvinylidene Fluoride (PVDF), Kynar heat shrink tubes have excellent cut-through resistance and protection against abrasions. PVDF tubes are specially made for high temperature applications.

2.     Polyolefin tubing

Polyolefin heat shrink tubing are the most commonly used because of their ease of use and low cost. From railway and automotive to aerospace and military, these tubes are used for a wide range of applications.

These are flexible and fast shrinking tubes, available in a variety of colors. This is why they’re often used for color coding, replacing the use of adhesive tapes. Flame retardant options are also available.

Why are heat shrink tubes used most often?

Irrespective of the material used for manufacturing these tubes, heat shrink tubing are durable and long lasting. These tubes seal excellently as they conform to the shape of cables upon heating. Since these tubes come in a number of colors, they also have an aesthetic appeal. Colored tubing helps organize the wires.

Overall, these tubes make the assembly of electrical devices and machines faster and a lot easier. It also saves you both time and resources by preventing future obstructions. These tubing reduce electricity related risks and protect the electric devices and equipment in industrial settings.

Browse through our products to find all the suitable heat shrink tubing and probe options. For quotes and more information, send an email at