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PTFE Sheet Excellent Mechanical Properties

Yangzhong Tianyou Seals Co.,Ltd | Updated: Sep 28, 2017

PTFE Sheet Excellent mechanical properties

Polytetrafluoroethylene in -196 ~ 260 ℃ within a wide range of temperature are maintained excellent mechanical function, perfluorocarbon polymer is one of the characteristics of low temperature does not brittle.

PTFE density is large, 2.14 a 2. 20g / cm3, almost no water, the balance of water absorption is less than 0. 01%.

Polytetrafluoroethylene is a typical soft and weak polymer, macromolecules between the smaller gravitational attraction, stiffness, hardness, strength are small, in the long-term stress will be deformed.

Polytetrafluoroethylene is prone to creep when loaded, which is typical of cold plastic. The creep of PTFE varies with compressive stress, temperature and crystallinity, and the higher the temperature, the greater the creep. The crystallinity of PTFE is between 55% and 80%, and the creep is not more than 2%. When the crystallinity is below 55% and 80%, the creep increases rapidly.

Teflon mechanical properties of the excellent characteristics of the friction factor is small, between 0. 01 and 0.10, in the existing plastic materials, and even the smallest of all engineering materials.

The friction coefficient of PTFE increases with the increase of the sliding rate, and when the linear velocity reaches 0. 5 to 1. 0 m / s or more, the static friction factor is smaller than the dynamic friction factor. This characteristic is used for bearing manufacturing, Can reduce its starting resistance, so that from start to operation are very smooth. The friction factor of PTFE decreases with increasing load, and tends to be constant when the load reaches 0. 8 MPa or more. At high speed and high load, the friction coefficient of PTFE is less than 0. 01. From ultra-low temperature to PTFE melting point,

Its friction factor is almost unchanged, only when the surface temperature is higher than the melting point, the friction factor is only a sharp increase.

Because of the small intermolecular gravity, PTFE hardness is low, easy to be worn by other materials. However, as long as the roughness of the grinding material surface is appropriate, can be reduced in proportion to the amount of PTEF wear.

What are the advantages of PTFE sheets?

High temperature - use operating temperature up to 250 ℃.

Low temperature resistance - with good mechanical toughness; even if the temperature dropped to -196 ℃, can also maintain a 5% elongation.

Corrosion resistance - for most chemicals and solvents, showing inert, strong acid and alkali resistance, water and a variety of organic solvents.

Resistant to climate - the best aging life in plastics.

High lubrication - the lowest coefficient of friction in solid materials.

Non-sticking - is the smallest surface tension in solid materials, does not adhere to any material, mechanical properties of its friction coefficient is very small, only 1/5 of polyethylene, which is an important feature of perfluorocarbon surface. And because the fluorine - carbon chain intermolecular force is very low, so polytetrafluoroethylene has a non - stick.

Non-toxic - with physiological inertia, as artificial blood vessels and organs long-term implantation in the body without adverse reactions.

Electrical properties Polytetrafluoroethylene has a low dielectric constant and dielectric loss over a wide frequency range, and has high breakdown voltage, volume resistivity and arc resistance.