Different Forms of PTFE Tubings Catering to Aerospace and Aviation Industries

PTFE tubing (polytetrafluoroethylene), is one of the fluoroplastics and is used in a number of industries. It is used in many critical and demanding applications. This especially holds true for an aviation and aerospace industry.
PTFE tubes is an indispensable product used in aircraft because of its typical properties. These unique properties include the low coefficient of friction, high-temperature resistance, low dielectric constant and inflammability.

Best Applications in Aviation Industry

PTFE is extremely important for the aviation industry as it has unique properties such as a low coefficient of friction, low dielectric constant, and inflammability.
Another key feature of PTFE is that the PTFE coating is very important for the aviation industry because of its temperature resistance. It helps in retaining physical properties ranging from temperatures such as -195 degrees Celsius to +260 degrees Celsius. Check out a few of the examples that use PTFE coating at work in the aerospace industry.
Aircraft Wings
PTFE is an essential material that is mostly used in the airplane’s components. For example, it is largely used in the production of leading edges of the wings of an airplane, these are the flaps that help in slowing it down during landing.
The low coefficient of friction of the material makes this possible. It is also used in PTFE coating and helps in the shielding in the aluminum rods. This helps minimize the increased vibration that it otherwise could have caused.
Electrical Connectors
Because of the importance of plug and play in the air, electrical connectors are the need of the hour now. The electrical connectors require low abrasion resistance values, easily provided by the PTFE coating.  
Fuel Systems
The features (PTFE coating) make it an integral part of the fuel systems. It is used widely in both inline and refueling parts to ensure that it remains safe and sound especially when the plane is in the air.
Some of the other applications of PTFE coating in aircraft are as follows,

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

PTFE Tubing: Process Parameters And Their Impact

PTFE Tubing extrusion is among the most difficult processes within the purview of the polymer space. All polymers have their set of peculiarities and these play a part in things like processing and machining. But PTFE tube comes with different process parameters, and finding the right combination that works consistently is something that not every tube manufacturer will know. Let’s find out some of the parameters here followed by PTFE hose manufacturers.

 

Handling: Handling resin is among the most important but easily overlooked part of PTFE processing. While many resin manufacturers give out layout guidelines for providing the shear on the resin before the processing starts these are more important for the tubing. 

Blending: The parameters about blending include the type of extrusion aid used. The blending needs to be done in the correct manner, the final extrude will either too soft or too dry. Furthermore,  the blend has to be uniform, the preform billet will have uneven densities, causing issues during the extrusion.

Preforming:  Preforming is done to create a shape that can fit into an extruder. 

• Preforming has two functions: first, it provides a solid shape and second, it also removes any air pockets form within the material. The process needs to be done in a way to keep too little pressure and not go for enough venting of the air inside the material. 

Extrusion: While extrusion is understandably the most important step, by the time the preform billet is loaded into the extruder, the preceding processes have already defined a lot of the tube’s final characteristics. Extrusion gives it the final shape and this process helps maintain both adequate pressures on the billet while maintaining the concentricity of the final tube. 

Sintering: Heat the tube in a way that the temperature needs to account for both a drying section and the sintering section. The drying section should be warm enough to evaporate all the traces of vapor from the tube. At the same time, if it is too warm, the vapors may start getting ignited. If the tube gets heated too quickly, there is a chance of over-sintering. Too much heat can cause dimensional deviations. In PTFE. Therefore the temperature must turn out the PTFE in a ‘gel state’ just before it leaves the sintering chamber and then cool down at room temperature.

The PTFE tube also undergoes a process called pigmentation, the addition of anti-static fillers also extrusion of specific profiles. All the above processes need to be modified to allow a proper end-result.

Industries and Uses for PTFE Tubing

PTFE is now one of the most popular kinds of industrial coating in the world, mainly because it has innumerable applications. Get a quick lowdown on PTFE, its applications, history, and the development of PTFE. 

 History of PTFE Hose and PTFE Pipes

• Polytetrafluoroethylene, or PTFE, was first created by Dr. Roy Plunkett.
• Like all great discoveries, Dr. Plunkett bumped into it when he was experimenting with some other testing materials which were refrigerants or so he thought.
• Interestingly, all he was doing was examining frozen and compressed tetrafluoroethylene when he came across this versatile material. He was surprised to see the polymerized material turning into a wax-like solid material. The new material was called “Polytetrafluoroethylene.”
• While he was making this discovery, Dr. Plunkett was working for DuPont and immediately after they turned this material into blocks.
• The blocks were coerced into varied shapes. Manufacturers all over the world today rely on this product and use it for producing different kinds of products. 

Common Applications of PTFE

PTFE has loads of uses. The common applications of PTFE can be used in a number of industries and they are following, 

·         Pharmaceuticals – PTFE coatings are an integral part of pharmaceutical industries because they provide over braid seals and strength which helps in a self-cleaning process.  If the pharmaceutical industry has elevated standards for all materials used within it, PTFE, caters admirably to all the set standards.

·         Cryogenic – The cryogenic industry has great use for PTFE too, mainly because it can withstand extremely high temperatures and low temperatures too. The material is perfectly suited for usage in fuel lines,  piston rings, hydraulic hoses, or liquid air systems.

·         Automotive – In the automotive industry the air brake systems need over-braided hoses and for that PTFE caters to these requirements too.

When the material is used on the outside edge of air compressors PTFE can fill in, as it has the power to resist high temperatures.

 Also, since PTFE can do away by removing carbon particles, it becomes an integral part of all types of automotive applications.

 

·         Aerospace industry – PTFE is part of the aerospace industry as it is part of different components such as fuel hoses, tubing hoses, and hydraulic hoses. 

PTFE is often braided with Kevlar for extra protection.

Also, PTFE is used for applications that need the tempering of heat in components such as oil, fuel, water, and alcohol. In the aerospace industries, it is the pneumatic and hydraulic systems, that use PTFE.

·         Chemical industry – In the chemical industry, there is the usage of some highly reactive chemicals that react with most materials, for transfer of such chemicals you’ll find that PTFE is used for things like product interchange. Refrigeration systems and steam lines also contain PTFE. It is a great substitute for materials such as corrugated, stainless steel hoses and so on.

PTFEtubes and PTFEhoses are usually regarded as a versatile product, one that caters to the needs of most industries, reason enough for you to use it for various purposes.

PTFE Production, Price and Market Demand in India

In today’s highly competitive world there are companies that are moving into higher value-added chemicals and materials. Further, environmental regulations are increasing the stringent rules as governments at the national, state and local levels are requiring that industries control pollution by limiting emissions. Thus there is a quest to limit those wastes and emissions. In this competitive environment, the filter end user, filtration design engineer or filter end user will require material to increase the performance and durability. This shows that the polytetrafluoroethylene PTFE tube is well suited to cater to the multitude of these demands and help the industry to meet the many environmental obligations.

In 2018, the demand for PTFE in India has risen and it is standing at approximately 5 KT and is expected to see a healthy growth rate during the forecast period.

The chief application of PTFE is in automotive and transportation sector and it is used in manufacturing of plain bearings, seals, gears, side plates, gaskets, bushings etc., where it outperforms nylon. The demand for PTFE used in the electrical and electronic industry is expected to rise more because of its excellent dielectric properties. PTFE film is used to produce substances such as carbon fiber composite which is especially used in the aerospace industry.

The PTFE is utilised to prevent the built-in part from sticking with other non-production material and acts as an obstacle to the bagging material in carbon-fiber composites. PTFE has the small pore structures that can make the fabric material breathable and waterproof. Furthermore, PTFE has other properties such as it is chemically and electrically resistant and hence can be easily  used in coatings, and due to its high viscosity, it can be used in missiles and aircraft as well. Furthermore, PTFE is an integral part of electricals and electronics industry owing to its easy flexibility and non-sticking properties.

PTFE OVERVIEW

PTFE was discovered by Dr. Roy Plunkett at DuPont in 1938. Earlier it was limited to wartime applications until after World War II when it was first introduced under with the trademark Teflon. Today, there are a number of suppliers which offers 60,000 tons/year. Where the large fluorine atoms form a sheath around the carbon backbone, providing it from attack from organic, acid, or base solvent, except at elevated temperatures. This sheath also imparts low surface energy and providing a very low coefficient of friction (< 0.1) and nonstick properties. This low surface energy renders PTFE hose  both hydrophobic and oleophobic, so neither the aqueous nor oily materials adhere to it. Thus, it is really easy to mechanically remove any dust or filter cake which gathers on the sur face.

PTFE monofilament or thread is fit for filter manufacture either as:

Talking about a sewing thread specific for sewing filter bags of PTFE or made for high-performance fibers that are used in hot gas filtration, such as baghouse filters found in the stacks of coal-fired boilers, cement plants and so on.

As a woven scrim for needle punching PTFE or other high-performance fibers to form the fabrics that are utilized in baghouse or other filter formats.

A filament for wound-core filters is used for corrosive liquid filtration applications.

All of these applications tap onto the superior chemical resistance and offers an excellent heat resistance of PTFE tubes.

Ptfe Hose Pipe and its Advantages

PTFE hose pipe or Polytetrafluoroethylene is an incredibly effective plastic material, ivory-white and opaque fluoropolymer; it is made up of free-radical polymerization of a host of tetrafluoroethene molecules that is in different industries and yes, it is not only an integral part of acid industries but also a major part of other industries such as the food and drink industry, the telecom industry and the pharmaceuticals.

 The Chief Properties of PTFE

Teflon hose is a flexible, thermal resistant, chemical resistant, non-stick and also electrically resistant material with its melting point being around 327°C, and pure PTFE has high flexural strength, even in very low temperatures, high dielectric strength and electrical strength. PTFE hose offers high resistance to water and fairly low coefficient of friction. PTFE’s density ranges from the 2200 kg/m3 mark.

The only con is that it may have a reaction to chemical agents and solvents such as chlorine trifluoride, xenon difluoride, cobalt (III) fluoride, or elementary fluorine if put through under high pressure and temperature conditions. PTFE does not  have high energy radiation, which forces the breakdown of PTFE molecules.
A Few Modified Features of PTFE

Apart from PTFE there are other two copolymers which has different properties.

Perfluoroalkoxy otherwise known as PFA has almost similar properties of PTFE as it is flexible, very chemically resistant and thermally stable and can be used up to 260 degrees C even if PTFE has the properties of being able to creep, PFA is creep resistant and is used for a number of properties such as extrusion, melt-processing, injection moulding, transfer moulding, compression moulding and blow moulding.

TFM, better known as PTFE-TFM, is polytetrafluoroethylene with perfluoropropylvinylether taken as an additional modifier, boasting of a material which is stiff being creep-resistant like PFA, and weldable.

Advantages of PTFE

There is no doubt about the fact that PTFE is indeed very versatile and has a huge number of applications to speak of. 

It is an integral part of manufacturing and engineering industries, it is not limited to using in tubes or liners or for handling or storing corrosive chemicals, but it is also used in parts such as bearings or screws to increase the lifespan of the parts and also the machinery it is part of. 

The longer lasting, higher-performance parts ensure that it enhances the efficiency of any machine it is part of, thus reducing the requirement of constantly replacing parts, which leads to saving money and reducing waste. Hence it will cut down on constant maintenance issues with the equipment which will lead to the reduction of any expensive manufacturing downtime due to the repairs and faults.

PTFE coat has non-wetting properties and felicitates self-cleaning which again reduces the cost of frequent cleaning.

 Teflon textile finishes are environment-friendly because the finish repels water and oil stains, and reduce the requirement of dry-cleaning and fabrics will also tend to dry up quickly, using far less energy with methods as tumble drying, and with the reduction of wear, it also tends to last longer.

The above-listed properties of PTFE quite explain why it is one of the most sought-after pipes and tubes catering to the needs of most of the industries.