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Parylene

Parylene Thermal Properties

Properties of Parylene

Parylene coatings have good thermal endurance and perform in air without significant loss of physical properties at 100° C in air for 10 years (100,000 hours). In oxygen free atmospheres, or in the vacuum of space, Parylene is expected to perform similarly on continuous exposure of 200°C.

In all cases, higher temperatures can shorten Parylene’s useful life in oxygen rich environments. If requirements for your application are near or exceed this time-temperature-atmospheric conditions envelope, it is recommended that you test the complete structure under conditions more closely resembling the actual conditions of intended use.

Data obtained following appropriate ASTM methods

Typical Thermal Properties Parylene N Parylene C
Melting Temperature (C°) 410 290
Linear Coefficient of expansion (10 ¯⁵/°C) 6.9 3.5
Thermal conductivity, @ 25°C watts/Meter. Kelvin 0.120 0.082

 

Thermal Properties of Parylene C vs. Urethane, Epoxy & Silicone

Properties Method or Conditions Parylene C Epoxies Silicone Urethanes
T (melting), °C Taken from secant moduleus-temperature curve 280 cured cured ~170
T (glass transition), ºC Taken from secant moduleus-temperature curve 80-100 120 -130 -10
T5 (where modules = 105)ºC Taken from secant moduleus-temperature curve 125 110 -125 >-30
T4 (where modules = 104)ºC Taken from secant moduleus-temperature curve 240 120 -80 0
Linear Coef. of Expansion(10″5/ºC) ASTM D696 – 44(61) 3.5 >4.5-6.5 25-30 10-20
Specific Heat @ 20ºCcal/g/ºC 0.17 0.25 0.42

 
Technical Data Sheet: PCT Properties of Parylene

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