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Tuxedo, can you give a little bit more information on the test sequence when testing the new breaker? What type of failure did occur? Did it occur during closing or opening the vacuum breaker? I guess at closing as you are talking about pre-strikes! Best regards, Uwe

Hello, does anybody know the material composition of Scotch Brite which is used for surface finish for steels, cleaning,...? We have encountered some unexplained dielectric failures of a Scotch Brite polished contact system in vacuum. An untreated system works perfectly. A rough idea would...

Thank you for your help. The material I chose finally was Inconel 600. It was the nearest fit with a mean expansion coefficient of about 15 between 20 and 800°C. It was the best fit I could get for my requirements.

Thank you for your replies. Best regards

Hello, Does stainless steel loose its non-ferromagnetic properties when exposed to temperatures up to 850°C (Brazing) for a period of several hours. Final use will be at low temperature. The steels we are looking in are 304, 310, 316, 321. Thanks

Hello, I am looking for a non-ferromagnetic, maybe a steel type and brazeable material which has an expansion coefficient in an order of magnitude of 8-15ppm/K from 20°C to 800°C , as mean value, would be ideal. Has anybody any ideas? Thanks!

Thanks for your reply! Finally I found some data in the metals handbook up to 1000°C for some steels. For 316 i found 16.0ppm/°C for 0-100°C. It matches quite well with the data I found. For the others I didn't check. Best regards, Uwe

Hello, I am looking for the thermal expansion coefficients (20->800°C) for the stainless steels: 304/L and 316L Thanks