Introduction to steel lined teflon tube

Firstly, imported PTFE powder is used to push (squeeze) the teflon tube, and then it is forced into seamless steel tube (liner outer diameter is slightly larger than tube inner diameter 1.5-2mm) to form a tight liner without clearance.In order to eliminate the pressure, it is put in the furnace, heated to 180℃ for constant temperature treatment, so that it can be used in the temperature below 180℃.At the same time, the axial tensile strength of push tube is better than that of wound tube.The pipeline has ideal positive and negative pressure resistance.

PTFE powder moulding method is a kind of body, such as pressure, such as isothermal manufacturing technology, through the extruded tube (loose lining, lining) of PTFE, PTFE belt winding and winding plus steel wire, and steel net within process of evolution, the PTFE lining powder compression molding technology is by far the PTFE lining the latest fifth-generation products, can be at a higher pressure, high temperature, strong corrosion under the conditions of use, the temperature below 200 ℃ and vacuum is 0.096 MPa, quenching heat or alternating operation, won't make PTFE grassroots fall off, the drum, expansion deformation of flat, thereby the fluorine steel body.

Chemical properties of steel lined teflon tube:

Air aging resistance: radiation resistance and low permeability: long-term exposure to the atmosphere, the surface and performance remain unchanged.

Non-flammability: the oxygen limit index is below 90.

Acid and alkali resistance: insoluble in strong acids, strong bases and organic solvents.

Oxidation resistance: resistant to corrosion of strong oxidants.

Steel lined teflon tube working characteristics:

Performance: working temperature of medium: -100℃~-250℃

Working pressure of medium: positive pressure: 2.5mpa, with negative pressure of 70KPa at normal temperature

Corrosion resistance: steel ptfe composite pipe, in addition to molten metal lithium, potassium, sodium, chlorine trifluoride, high temperature trifluoride oxygen, high flow rate of liquid fluorine, it can resist almost all chemical media, including concentrated nitric acid and aqua aqua corrosion, it can work for a long time in the temperature of 230℃-250℃.Steel polyvinylidene fluoride or other vinylidene fluoride composite pipe, halogen, halogenated hydrocarbon, strong oxidant, boiling acid, alkali, a variety of organic solvents have good corrosion resistance, but not resistant to smoke sulfuric acid, concentrated hot sulfuric acid and nitric acid, 90℃ above ketone, ester, amine and high temperature sulfonating agent corrosion.

Application fields of steel lined teflon pipeline:

Steel lined tetrafluoroethylene pipe is suitable for strong corrosive gas and liquid under high temperature, other types of steel plastic composite pipe and metal pipe are not suitable for conveying medium, steel ptfe composite pipe is suitable for all.In addition, steel polyvinylidene fluoride composite pipe suitable for the transport of corrosive media at the working temperature of -40℃~+150℃.

 

 

What is suspended ptfe and dispersed ptfe?

Due to the different polymerization methods of ptfe, there are suspension materials (suspension polymerization) and dispersion materials (dispersion polymerization), namely suspension ptfe, disperse ptfe, the processing methods of the two materials are also different.

Suspended material (suspended polytetrafluoroethylene)

Its main forming method is die pressing method, that is, white powder without a little additive, then die pressing forming, sintering above its melting point temperature, and then through appropriate mechanical processing into products, the representative products for the plate, bar, tube, film four categories.

Dispersion material (ptfe)

PTFE fine powder prepared by dispersion polymerization method is generally referred to as "dispersion".Because of the fibrotic properties of this fine powder, especially at temperatures above 20℃, it is recommended to store, transport and mix the material at 5 ~ 10℃.The forming method of this kind of material is to use an auxiliary agent (usually petroleum ether or gasoline) and powder after mixing in the environment of 24℃ or more for about 24h (complete the crystal phase change) and then forming, with the piston extrusion forming, drying, burning.This processing method is commonly known as paste extrusion, also known as push.

Due to the dispersion of fine powder particle size, divided into several grades of specifications, different specifications have different compression ratio characteristics.Compression ratio of less than 100, generally used to produce raw material and microporous tape;Low compression ratio of less than 500, used to produce medium and large specification products;500 ~ 2000 is medium compression ratio.2000 ~ 4400 is high compression ratio material, this material is suitable for the production of thin wall thin line, can continuously large length and high efficiency production.

Identification method: the main difference is the particle size of the two are not the same.Suspension material is coarse, dispersion material is fine.

         

 

 

What is the PFA

I. What is the PFA?

The English name of PFA is Polyfluoroalkoxy, or tetrafluoroethylene perfluoroalkoxyethylene ether copolymer (perfluoroalkylate, soluble polytetrafluoroethylene).PFA resin is relatively new fluoroplastic that can be processed by melting. PFA, FEP and PTFE have similar chemical properties, but FEP can only be used below 200 degrees, and PTFE cannot be injected. 【this resource was first published by China fluoroplastics network.】

1. Specific gravity: 2.13-2.167g/cubic centimeter

2. Molding shrinkage rate :3.1-7.7%

3. Molding temperature: 350-400℃

4. The melting point of PFA is about 580F and the density is 2.13-2.16g /cc (g/ cubic centimeter).

II. Features and main USES of PFA

PFA, commonly known as fusible PTFE, is the crown of fluoroplastics with various properties and USES similar to FEP.Widely used in semiconductor industry, as well as medical, chemical corrosion protection, automotive and other fields.

PFA products include granular products for molding and extrusion, and powdery products for rotating molding and coating.Its semi-finished products are membrane, plate, rod and pipe.PFA resin distributed in the American market includes Teflon of DUPOut, Neoflon of Daikin, Hthen of Ansimont and Hostafl of HOechst Celanese.

1. Main USES of PFA:

(1). Suitable for making corrosion resistant parts, wear - resistant parts, seals, insulation parts and medical equipment parts.

(2). High temperature wire, cable insulation layer, anti-corrosion equipment, sealing materials, pump valve bushing, and chemical containers.

2. Molding performance

(1). Crystallization material, small moisture absorption.Products may be processed by the usual thermoplastic processing method.

(2). Poor liquidity, easy decomposition, decomposition produced corrosion gas.It is advisable to strictly control the molding temperature not to exceed 475 degrees, the mold should be heated to 150-200 degrees, the pouring system should have little resistance to the material flow.

(3). Translucent granule, injection molding, extrusion molding.Forming temperature 350-400 degrees, 475 degrees above easy to cause color or bubble.And notice that it's harder to get out of the mold.

(4). Because the molten material on the metal corrosion effect, long-term production, the mold needs to electroplate chromium treatment.

3. Material performance

1. PFA is a copolymer of a small amount of perfluoropropyl perfluoroethylene ether and polytetrafluoroethylene.The melt bond is increased, the solution viscosity is decreased, and the performance is not changed compared with ptfe.The resin can be processed into products directly by ordinary thermoplastic molding.

2. long-term use temperature -80- 260 degrees, excellent chemical corrosion resistance, corrosion resistance to all chemicals, friction coefficient in the lowest plastic, and very good electrical performance, its electrical insulation is not affected by temperature, "plastic king" said.

3. Its chemical resistance is similar to ptfe and better than vinylidene fluoride.

4. Its creep resistance and compression strength are better than ptfe, with high tensile strength and elongation up to 100-300%.Good dielectric property, excellent radiation resistance.

5. non-toxic: with physiological inertia, can be implanted in the human body.

 

 

6 Key Reasons PEEK Works Well for High-Performance Bushings

PEEK, which stands for polyetheretherketone, is a well-known engineering thermoplastic. It has become a popular choice for bushings that must operate in demanding high-speed, high-temperature environments.

In this post, we will look at 6 reasons why PEEK actually works well in such hostile environments.

 

1. PEEK Can Take the Heat

PEEK bushings can operate continuously in temperatures up to 480°F without loss of their key tensile and flexural properties. In addition, when exposed to flames, PEEK bushings exhibit low smoke and have a very low toxicity rating, and it even has a V-0 flammability rating.

2. PEEK Has Good Chemical Resistance

PEEK has very good resistance to a variety of aggressive chemicals and is also compatible for use with steam and hot water. It is inert to common solvents and can resist many chemicals, both organic and inorganic.

3. PEEK Is a Good Replacement for Metals

PEEK an excellent replacement option for metal bushings because of its chemical resistance, strength properties, and the fact that it is up to 70% lighter than the metal parts it can replace. In fact, it’s light weight has made it a popular choice for aerospace applications, where weight and fuels savings are key design factors.

4. PEEK Has High Strength

PEEK is considered the high-strength alternative when it comes to hostile environments where other polymer bushings simply can’t perform. It’s high tensile strength and impact strength make it an excellent choice for aggressive applications.

5. PEEK Is Durable

Another key benefit of PEEK bushings is their durability and excellent fatigue life. In fact, some PEEK parts have been shown to exhibit up to 100 times better fatigue performance than their metal counterparts.

6. PEEK Can Be Improved by Additives

There are a variety of additives that can further enhance PEEK’s already outstanding properties, including glass and carbon fiber. Carbon and glass can enhance PEEK’s tensile, compressive, and flexural strength, reduces its coefficient of thermal expansion, increase its thermal conductivity, slightly increase its hardness, and significantly increase its deflection temperature.

Conclusion

The combined strength, thermal, and chemical properties of polyetheretherketone make it an excellent choice for high temperature, environments in need of bushings. Add to that its ability to serve as an excellent replacement for metal bushings, and its ability to have its properties further enhanced by additives like glass and carbon, and PEEK quickly stands out as a top choice for high-performance polymer bushings.

Tags:PEEK,High-Performance Bushings

The Many Uses of Teflon, a.k.a., PTFE Industrial Coating

Most people have never heard of PTFE industrial coating, but when you mention Teflon, a look of understanding passes easily on their faces. PTFE (Polytetrafluoro Ethylene) is the technical name of the material, and it’s commonly sold under the Teflon brand name, which is manufactured by DuPont. Dr. Roy Plunkett, a researcher who worked at DuPont, is credited with developing PTFE industrial coating in the late 1930s.



At the time of his discovery, he was actually trying to create a new refrigerant. During the course of development, he noticed that the gas inside the bottle he was using actually stopped flowing out before the bottle should have been empty. He sawed the bottle open and discovered that the inside was coated with the non-stick material we now know as Teflon. His contribution has changed the face of plastic manufacturing forever.



Teflon is probably best-known for its role as the non-stick surface inside cookware. This is because PTFE industrial coating is one of the most slippery materials that’s in existence today. In addition to being slippery, the material also brings a number of other features to the table, offering high temperature resistance, little reaction to most chemicals, and reduced stress cracking and corrosion. These features make Teflon perfect for numerous applications, including:



Cookware – As already mentioned, the slippery surface created by Teflon makes it perfect for cookware. Many brands offer lines of cookware that are coated with PTFE in order to prevent food from sticking to the pots and pans. This reduces the need for cooking oil because these pots and pans are naturally non-stick.



Nail polish – That smooth surface that doesn’t crack is often achieved through the use of PTFE industrial coating.



Hair styling tools – Hair straighteners and curling irons are often coated with Teflon because of the high temperatures emitted by these tools.



Windshield wiper blades – There are numerous applications for PTFE industrial coating within the automotive industry as well. The blades of windshield wipers are the most notable because the smooth surface enables them to glide smoothly across the windshield.



Fabric and carpet protection – Stains are less likely to stick to carpets or fabrics that have been treated with PTFE industrial.



Chemical and steel industries – Hoses and other machine parts commonly handle some highly corrosive substances that sometimes are transferred at extremely high temperatures. PTFE industrial coating is one of the best materials to handle this type of use because it addresses all of the problems that are otherwise caused by working with chemicals or steel. Every type of hose will deteriorate over time, but those that are made of PTFE industrial coating will do so much more slowly than those made of other materials because of the many features of the material.



Where would the world be without PTFE industrial coating? There is a good chance we wouldn’t be able to do much of what we are able to do right now if this material had never been invented. Almost everything we do on a daily basis brings us into contact with Teflon, so we should all be thanking the memory of Dr. Plunkett and his marvelous discovery. When he first developed this material, he probably had no idea that it would become a household name that is critical in everyday life.



The experts at Toefco will help you figure out if Teflon is the right solution for your project. They understand the intricacies that go into selecting the right materials for projects that may have touchy consequences because of the difficult variables you are dealing with. Only an expert will be able to tell you if the combination of features offered by Teflon will create the right circumstances for what you are working on.



Tags:PTFE,Teflon,PTFE coating,Cookware