Hey everyone, We use sf6 filled sparkgaps at work (10 psi), the insides after much use are coated in a white powdery substance. Can anyone tell me what this substance is, and how toxic it is. Thanks John "Jay" Howson IV Sent from a tiny phone with a tiny keyboard. _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla