It is a hydrophobic polymer and has the lowest coefficients of friction of any solid. PTFE possesses low tensile strength , high wear resistance, and low creep resistance. It is very non-reactive. Because of this property, it is used to coat the surface of many cookwares, commonly known as non-stick pans. Due to its high chemical and corrosive resistant properties, it has been used as a coating for pipelines and containers where reactive and corrosive chemicals are applied.
PTFE is used in many computer applications such as hookup wires, coaxial cables etc. PTFE is also used as a lubricant to reduce the friction and increase wear resistance. However, the crystalline nature of PTFE does not generally allow it to exhibit a noticeable glass transition temperature T g.
The free radical polymerization process synthesizes PTFE. Owing to its excellent thermal and corrosive resistance, it is not easily machinable.
Sinter and press methods in powder metallurgy are used to process molding powders. PTFE can also be extruded using tam extruder techniques. Skip to content Seal Connect is your source for all things sealing, maintenance and reliability.
Seal Connect Home Blog. Rotating Equipment. These properties can be seen primarily in their: Thermal-resistance Physical and mechanical properties Density Structure Plastic consists of polymers, which are large organic molecules. High-Performance Plastics for Critical Applications This article focuses on engineered, high-performance plastics often used for or with critical sealing technology.
They are often used to design compounds by adding fillers to suit specific applications, such as the following: A throttle in an air seal A lantern ring for a stuffing box Bushings or bearings for shaft stabilization The plastics used are important. Polytetrafluoroethylene Polytetrafluoroethylene PTFE , a universal material, performs well in many applications. Strengths Limitations Broad chemical resistance Creep and cold flow Nonflammable Relatively soft Flexible at low temperatures Low thermal dissipation Low coefficient of friction COF Poor dimensional stability Stable at high temperatures High material shrinkage Relatively easy to process Low rigidity HF resistance Low electrical conductivity Table 1.
PTFE strengths and limitations 2. PET strengths and limitations 3. PPS strengths and limitations 4. Polybenzimidazole Polybenzimidazole PBI is a high-temperature material. PBI strengths and limitations 5. PEEK strengths and limitations High-Performance Industrial Plastic Trends The mass production of industrial plastics began in the s, and since then, the industry has grown exponentially. Share this:. In her roles, Ditoro has learned about the process and manufacturing industries and the equipment and technology that keep plants and other facilities operating.
She also developed a passion for telling the operators' and technicians' stories. She may be reached at lorid sepcousa. Read more from this author. Reply on Twitter Retweet on Twitter 3 Like on Twitter 3 Twitter Reply on Twitter Retweet on Twitter 0 Like on Twitter 0 Twitter Related Articles. When selected correctly, all types of mechanical seals will thrive. First, understanding what they Contact an Expert for details — Category Select Industry Select The value of this field will override other options.
Subscribe today to the Seal Connect newsletter. Each month, you will receive solutions to tough industrial sealing issues, including sealing powders and slurries, ensuring stuffing box reliability, maintaining lubrication reliability, and preventing bearing failure.
Please enter a value greater than or equal to 1. Please select Bead blasting is often used in creating a uniform surface finish on machined parts. Dry bead blasting is primarily used on stainless steel finishing, for any type of fabrication and gives the metal a satin finish. Wet blasting, sometimes referred to as vapor blasting is the process for removing a coating layer e.
By creating a smooth surface, grit blasting removes the pits and cracks that frequently harbour moisture and contaminants.
Due to its high etch properties, its ability to be recycled and its fast working speed, aluminium oxide is an extremely popular media that we offer in our grit blasting service. Dry ice blasting is an environmentally friendly coating removal solution which uses a solid form of carbon dioxide to strip unwanted paint, rust and other coating layers without damaging the surface material underneath.
Glass grit blasting is a low cost and low impact media, often used for vehicle and automotive part refurbishment. Plastic grit blasting is a plastic media often melamine that can be used for cleaning, coating stripping and deflashing purposes. Our pyrolysis burn off oven is an extremely effective solution for the removal of plastic or paint coatings and contaminants.
Our coating removal processes ensure the integrity of the surface material is left undamaged, whilst removing rust, paint or any other unwanted coating. PTFE Polytetrafluoroethylene is a synthetic fluoropolymer of tetrafluoroethylene and is known for being one of the most versatile plastics available. Being hydrophobic, non-wetting, high density and resistant to high temperatures, PTFE is an incredibly versatile material, probably best-known for its non-stick properties.
The key properties that Virgin PTFE is widely known for it's extreme chemical resistance, thermal stability, electrical insulation and it's very low coefficient of friction. Glass fibre is used as a PTFE filler as it offers much improved compression and wear properties.
Carbon filled PTFE provides good thermal conductivity, low permeability and is also electrically conductive. Stainless Steel Filled PTFE is extremely hard wearing, has excellent strength and stability under extreme loads and elevated temperatures. O ur technical experts can quickly tell you what PTFE solution is best for your project.
This guide explains the coating procedure from start to finish, as performed by our expert engineers. The versatility of Teflon coatings allows for almost unlimited application to a wide variety of part sizes and configurations, always adding value far beyond the inherent non-stick qualities.
Specifically developed for use at elevated temperatures and for prolonged use at elevated temperatures, AF retains its key physical properties to temperatures 30OC higher than standard AF Virgin PEEK. VICTREX PEEK has a wider range of processing options, is lighter and more durable than many metal counterparts, and as such makes an effective and cost efficient replacement for metals.
Through melt processing PCTFE resin can be modified to give different mechanical and optical properties by controlling the crystalinity of the material. Our polyurethane materials range from shore A hardness 57 to 95 and are all Hydrolysis resistant — often referred to as H-PU.
FEP coatings Fluorinated Ethylene Propylene Copolymer melt and flow during baking to provide smooth non-stick, non-porous films with excellent abrasion resistance. PFA Perfluoroalkoxy coatings melt and flow during baking to provide non-porous films and increased permeation resistance.
The resins within these coatings are the toughest within the fluoropolymer range and can be applied at film builds up to 1, micrometers. We are experts in precision engineering plastics with an unrivalled level of ability. One of our main strengths is the vast range of fluoropolymer materials we have available. We can even work with you to create a bespoke material that's ideal for your application. Polytetrafluoroethylene or PTFE is a particularly versatile ivory-white and opaque plastic fluoropolymer; it is made by the free-radical polymerisation of many tetrafluoroethene molecules, and is suitable for a wide range of applications in industries as diverse as aerospace, the food and drink industry, pharmaceuticals and telecoms.
PTFE is produced by AFT Fluorotec in rods or tubes of any size, or filled with glass, carbon, stainless steel or many other materials to increase wear resistance and strength, whatever your project or build, we are sure to have a material that will work for you. In fact, beyond reaction to some chemical agents and solvents for example, chlorine trifluoride, cobalt III fluoride, xenon difluoride or elementary fluorine if at a high pressure and temperature , the only factor to be taken into consideration when using PTFE is that it does not have a good resistance to high energy radiation, which will cause breakdown of the PTFE molecule.
PFA or Perfluoroalkoxy has very similar properties to PTFE in that it is very chemically resistant, flexible and thermally stable with continuous use up to degrees C , but while PTFE does have some tendency to creep, PFA is creep resistant and is excellent for melt-processing, injection moulding, extrusion, compression moulding, blow moulding, and transfer moulding. Pure or virgin PTFE can deform badly under a load, but the use of fillers can help with this, though it should be noted that not all filled PTFE is suitable for use with food.
Adding a filler to PTFE can increase its strength, improve resistance to abrasion, add electrical conductivity and more; however, adding fillers can also reduce some of the advantageous PTFE properties, such as chemical resistance which will be limited by that of the filler.
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