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
