Dear Sirs,

can you recommend a resin which can be used to attach a thermocouple (PTFE insulated or fibreglass insulated) to the inside of a brass bolt, which can withstand temperatures up to 250degC? I'm looking for a very small amount, so ideally a small bottle should be enough if it's available of course.

Regards,
Tom

Hi Tom,

I'm afraid that we don't have any resin systems that could be used for electrical potting in an operating temperatre of 250C. Our High Tempaerature Epoxy Resin system has a rated HDT of 180'C (although we have tested it to 200'C and had no problems). You might find that it would be OK at 250'C but because this would be beyond its rated temperature then it would be up to you to test and assertain its suitibility.

Best regards, Matt

Matt Statham
Easy Composites / Carbon Mods - Technical Sales

Hi,



PTFE can not be bonded by ordinary means, only special glues for PTFE will bond it properly, you are much better off securing the thermocouple mechanically inside the brass bolt  

If there is some way you can secure the temperature probe mechanically, you can mix  bonding epoxy with aluminum powder.

It will loose its ultimate strenght at the high temperatures, and will deteriorate slowly with time exposed to high temp, but it will conduct the heat, and "fill the gap"

Glass-fibre insulated thermocouples will be bonded, but again, try to secure them mechanically.

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Hi guys,

thanks for the information. I've now decided to use a 1.5mm TC probe and a Swagelok tube adapter to hold it in place. Solves all my problems.

Thanks,
Tom