Recently happened to me. Those 'agency-recognized' molders are just wonderful...
In any case, we were lucky - caught the variation prior to shipping to customer. Detected incorrect material by application of a known force to a specific point and measuring deflection. May not necessarily work for you as this depends on plastic types. luck, Brian From: [email protected] [mailto:[email protected]]On Behalf Of Tyra, John Sent: Wednesday, December 19, 2007 9:18 AM To: [email protected] Subject: Looking for quick method of telling plastic material apart Hello everyone, One of our vendors changed the plastic material on one of the safety controlled parts they make for us and unfortunately they cannot tell us what lots this may have affected. The parts made from the two plastics look identical to the naked eye.... Any suggestions on a quick and dirty test to determine the difference between two plastic materials? We were able to determine the plastics were different by IR Method but I am looking for a fast way to determine the difference for finished product which is quick and nondestructive if possible. We tried determining the difference by the melting point of the plastics by touching a hidden surface with a soldering iron set to a precise temperature but the plastics are too close in rating for this to be effective. I am also looking at possibly doing an insulation resistance test to see if it is possible to see a wide enough variation in resistance as a measure but think this may be too difficult to get enough of a difference as the plastics are insulating material. Any suggestions are appreciated. Regards, John John Tyra Manager Product Safety Bose Corporation The Mountain, MS-450 Framingham, MA 01701-9168 Phone: 508-766-1502 Fax: 508-766-1145 - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
