My use of thermal grease was discontinued several years ago by request of various agency engineers reviewing test data/technique. And more recently, during my ISO 17025 audit, the NCB auditor explicitly directed me to never use thermal grease for thermocouple application. And auditors from other NRTLs/NCBs have emphasized, at least verbally, that thermal grease is not acceptable.
R/S, Brian -----Original Message----- From: Ron Pickard [ mailto:[email protected]] Sent: Friday, April 25, 2003 10:19 AM To: [email protected] Subject: Re: Thermocouple glue To all, I'm surprised that no one hasn't mentioned this yet. In the past for this application, the securement that I was introduced to was fiberglass tape and that white thermal grease. The tape exhibited high thermal stability and was used to secure the thermocouples, but left adhesive residue when removed after a temperature test. The thermocouple was inserted into the grease which offered excellent thermal conduction from the measurement point to the thermocouple. The downside to this grease, as anyone who's used this grease would say, is that the grease is "messy to the extreme" and it generally could not be completely removed from any surface that it came in contact with. And, it always found a way to get onto unintended surfaces including clothing. But, as a plus, the thermal grease would stay put physically over a very wide temperature range.
