The PTFE, sometimes referred to as “Teflon” is an strange material since it’s a thermoplastic however, it is also a thermoset. Although other thermoplastics can be reused after moulding, PTFE cannot. Furthermore, although the PTFE temperature ranges from between -400 and +550 degrees Fahrenheit the material begins its transition process at various points, which means it is that PTFE substance shifts because of the temperature of its surroundings.
With PTFE temperature limits of 400 degrees and the maximum temperature of +550 it will keep its structural integrity intact and work flawlessly even at temperatures that are extremely high. It is only important that you must be aware of potential shrinkage. If the Teflon temperature limits are too low, the PTFE components may shrink beyond the tolerance of your dimensions.
The properties of PTFE
Teflon’s highest temperature is 500 degrees Fahrenheit which makes it among the most widely utilized fluoroplastics despite the fact that its mechanical properties aren’t as good when compared to other prominent engineering plastics. However its Teflon temperature range makes it ideal for a variety of applications.
Thermal Stability
PTFE is among the top thermostable plastics. It is not able to decompose quickly, and not until placed in a highly high temperature. The temperature influences the thermal coefficient of linear expansion. Because of the direction of the work process the coefficient of expansion changes in relation to direction.
But the thermal conductivity of PTFE is not affected by temperature. It’s quite high, and that is the reason why PTFE is considered to be an effective insulation. It is also possible to be increased by adding appropriate fillers.
PTFE is extremely strong and is resistant against other compounds and elements. However, it could be damaged by alkaline metals in their basic state Chlorine trifluoride and fluorine in its elementary form at high pressure. High-energy radiation has the capability of breaking PTFE molecules making the material’s resistant to radiation very insufficient.
Its permeability PTFE is similar to other plastics. Permeability of a material is not just determined by its thickness or pressure but also by methods employed during its production process.
Melting Point
PTFE is an thermoplastic polymer which forms the appearance of a white solid at room temperature and an melting point up to 500 degrees F. It can maintain its hardness, strength and self-lubrication in a low temperature, like 400 degrees Fahrenheit, and has the right flexibility when temperatures exceed 110 degrees Fahrenheit.
All fluorocarbons, not just PTFE are able to acquire their properties due to the effect from the carbon-fluorine bonds. The only chemical that could influence these carbon-fluorine bonds are reactive metals such as alkali metals.
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How does temperature affect the Properties of PTFE?
The properties of PTFE remain the same in the event that temperature is significantly elevated, which could cause melting. Additionally, it is dependent on the type of fillers employed. In the case of a standard temperatures the pure PTFE will have a maximum tensile force of 4075 psi. However, once the temperature rises to 500 degrees Fahrenheit the strength decreases to just under 1000 psi.
In a similar way the carbon graphite-filled substance has a tensile force of 3300 psi at the normal temperature. However, when the temperature rises up to 500°F the strength of the tensile reduces to 990 pisi.
However the numbers of elongation will be affected. At room temperatures pure PTFE will have an extension rate of about 330 percent. However, it decreases to 200% when the temperature rises by 500°F.
The factors to consider when calculating the temperature of PTFE
Before you decide about your Teflon operational temperature be aware of the benefits of setting the temperature at that level in addition to the component you’re making and the temperature you need to reach.
It is the Teflon temperature spectrum is vital for an manufacturer of PTFE products in the development of high-temperature seals, bearings and even structural parts. The temperature range that is set will determine if the part you have manufactured will meet your expectations or exceed the tolerances of your dimensions.
If you take into consideration the thermal conductivity as well as the thermal expansion properties of Teflon material, you’ll recognize how important it is to maintain the correct temperature prior to the beginning of the manufacturing process.
Below are some examples of the parts made of PTFE as well as the requirements.
Bellows PTFE bellows can be employed in food, chemical and medical applications to serve to balance components of engineering. The diverse geometries of folds can be conceived and manufactured in highly flexible or pressure-resistant models that offer more elasticity and compressive force.
The number of runs, external and internal pressure, and all-closed/all-opened lengths are all important aspects to consider while building a bellow.
Seats for ball valves: The PTFE ball valve seat is often utilized as the primary material for inserts and valve seats that are essential elements in the industry of valves. PTFE is a non-stick seat and can be used with a broad variety of media. Filled grades provide greater wear resistance and are able to accommodate heavier weights in the more expensive class of valves.
O Ring and Back-up Rings: PTFE O rings are employed for static sealing in cylinders, pipes, bushings, flanges and connectors. The most important aspects to take into consideration in this regard are physical and chemical inertia and friction resistance, temperature and age.
Back-up rings on the contrary, aren’t seals, however they can be utilized in high-pressure applications with O-rings and other seals. They typically are put on the downstream side of the gland but they could be placed in the opposite direction of an ring to make an ultra-high-performance seal that doubles up.
Insulators PTFE often is used for insulation due to its remarkable dielectric properties, specifically in high microwave and radar frequencies. PTFE is also able to withstand temperatures that range from -180° Celsius up to +260 degree Celsius.
Labware: Due to the fact that Teflon maximum temperature can exceed at 260 degrees Celsius and the amazing technical characteristics it has like resistant to chemical attack, this product has been commonly used in labs. Its non-adhesive, smooth surface, and its hydrophobic properties ensures low cross-contamination as well as ease of cleaning.
Seals Seals made of PTFE can make a difference in any closure because of its ultra-high strength, making it suitable for sealing solutions to even the most challenging applications.
Bushings: Bushings constructed with PTFE offer maintenance-free solutions for high load and medium speed applications. They have excellent frictional properties as well as high operating temperatures.
