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Comparison between PCTFE and PTFE

Views: 145     Author: Site Editor     Publish Time: 2021-09-04      Origin: Site

PTFE and PCTFE are two very similar polymers. PTFE is a more general material, widely applied in high temperature, corrosive chemicals, high voltage or high wear/friction. But sometimes there are applications of PTFE that do not meet the requirements in practice. The high linear coefficient of thermal expansion of PTFE means that it can not maintain its size when the temperature changes. In this case, PCTFE is more suitable, but its cost is 10 times that of PTFE.



1. Introduction


Polytetrafluoroethylene is a polymer of tetrafluoroethylene. The English abbreviation is PTFE. The trade name is teflon, which is known as theking of plastics. It is a polymer compound formed by polymerization of tetrafluoroethylene. It has excellent chemical stability, corrosion resistance and tightness, high lubricity and non stickiness, electrical insulation and good aging resistance. It can work for a long time at the temperature of +250℃ to -180℃. Besides molten metal sodium and liquid fluorine, it can withstand all other chemicals and there is no change even if it is boiled in aqua regia. PTFE can be made into PTFE teflon film, PTFE sheets, PTFE insulation tape, etc.


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Polychlorotrifluoroethylene (PCTFE), also known as fluoroplastics 3 (F3), is a kind of chemical. It can be applied to make engineering plate, bar, pipe, corrosion-resistant pump, valve parts, suspension, anti-corrosion, electrical insulation coating and film. It is a white powder with a crystallinity of 85%-90%. The relative density is 2.07-2.18 and the refractive index is 1.429-1.439. Its melting point is 215℃, decomposition temperature is more than 315℃, glass transition temperature is 58℃, thermal deformation temperature is 75℃(1.82 MPa) and zero strength temperature is 270℃. It has good low temperature performance and its long-term service temperature is -200~300℃. It has excellent light transmission, ultraviolet, infrared and gas barrier properties and its chemical stability is second only to polytetrafluoroethylene.



2. The Difference between PCTFE and PTFE

(1) Properties

① Tensile Strength

PTFE: 20-30 MPa

PCTFE: 30-35 MPa

In the case of slightly higher tensile strength, the ratio of PCTFE is higher than that of PTFE.


② Elongation



PCTFE is harder than PTFE, which means it lacks the softness of PTFE in sealing, but it is also easier to maintain the size.


③ Melting Point

PTFE: 350-380℃

PCTFE: 200-220℃

Polytetrafluoroethylene is still the preferred application at high temperature.


④ Dielectric Breakdown Voltage

PTFE: 50-100 kV/mm

PCTFE: 20-40 kV/mm

Polytetrafluoroethylene has higher direct dielectric strength.


⑤ Friction Coefficient



As a non stick material, polytetrafluoroethylene has a high ratio.


(2) Processing

① Injection Molding



PCTFE has more versatility in processing, allowing more complex parts.


② Die




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(3) Characteristics

① Chemical Resistance

PTFE: extremely good

PCTFE: very good

Polytetrafluoroethylene is still outstanding in terms of chemical resistance.


② Thermal Stability

PTFE: good

PCTFE: very good

PCTFE is more stable in a wide temperature range than PTFE.


③ Price

PTFE: medium

PCTFE: high

PCTFE is more expensive than PTFE, so it is only applied for some specific functional applications.


PCTFE and PTFE have their own advantages and disadvantages. PCTFE can be applied at more than minus 100 degrees, while PTFE can not be applied (For example, PTFE often can not meet the requirements in wide temperature range and high stability applications), and PCTFE has better wear resistance and hardness than PTFE. PCTFE is many times more expensive than PTFE. PTFE is more widely applied because of its low price. PTFE sealing tape can also be used in water pipe sealing tape and gas seal tape.


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