Highly Thermally Stable Flexible Heater Compound Arlon’s 27CR (UL Recognized Flexible Heater Compound)
●Introduction:
■The purpose of this application note is to describe the benefits of Arlon’s highly thermally stable flexible heater compound. Arlon’s UL recognized 27CR compound has improved thermal aging resistance that is superior to current products on the market. The 27CR compound and calendered flexible heater substrates have proven superior thermal aging resistance through rigorous analysis, including long term property retention during accelerated thermal aging. Long term thermal stability with good tensile strength and dielectric strength retention has been validated through a UL746B program, Polymeric Materials - Long Term Property Evaluations. The 27CR compound also shows superb short term resistance to excessive crosslinking, which leads to retention of flexibility in extreme thermal environments. Derivation of an Arrhenius equation through analysis of silicone coated flexible heater substrate adhesion strength, a key calendered substrate property, further validates compound longevity in high temperature environments. Thermal aging analysis of key material properties places the 27CR compound best in class versus leading competitors.
■Most silicone flexible heater substrates will lose a large percentage of their initial post cured tensile strength, elongation, dielectric strength, and bond strength at elevated temperatures, especially at temperatures over 200oC. Silicone inherently has superb thermal oxidative stability, but at extreme temperatures silicones can start to lose flexibility and strength. This occurs because of the excess energy being absorbed by the silicone from extreme temperature exposure. There are two main processes that occur that cause the thermoxidative breakdown at temperatures between 200-350oC. Firstly, excessive crosslinking can take place, which will cause the silicone to lose its flexibility and become brittle. Secondly, pendant groups on the silicone polymer backbone can volatilize off the silicone compound, which can result in a loss of key physical properties. Finally, oxidation of the silicone forms silicon oxides[1]. Arlon’s 27CR flexible heater compound is designed with thermo-oxidative stability in mind so coated substrates remain flexible. The 27CR compound and coated flexible heater substrates do not deteriorate as easily as the competition at higher temperatures, which results in minimum loss of key properties at temperatures in excess of 200°C.
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highly thermally stable flexible heater compound 、 laminates 、 Flexible Heater Compound |
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Technical Documentation |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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2017/08/01 |
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384 KB |
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