A quick guess. I think your PBT is solvent in acetone. Your nylon is not. I quick swipe with an acetone q-tip should see a difference.
Fred Townsend DC to Light Consulting Tyra, John wrote: Hello Nick, Thanks for responding.. The good material is Nylon 66 and the bad material is PBT. The issue is the bad material cracks when a screw is inserted into the mounting screw boss.. The nylon is much more complaint while the PBT is harder and more brittle........ Any thoughts are appreciated..... Regards, John From: Nick Williams [mailto:[email protected]] Sent: Wednesday, December 19, 2007 1:12 PM To: Tyra, John Cc: [email protected] Subject: Re: Looking for quick method of telling plastic material apart John, It would help (a lot!) to know what the plastic is, and what the differences are between the material used in the good parts and that used in the faulty parts. Nick. At 12:18 -0500 19/12/07, Tyra, John wrote: 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 eyeŠ. 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 Text inserted by Platinum 2007: This message has NOT been classified as spam. If it is unsolicited mail (spam), click on the following link to reclassify it: http://127.0.0.1:6083/Panda?ID=pav_233570 <http://127.0.0.1:6083/Panda?ID=pav_233570&SPAM=true> &SPAM=true - ---------------------------------------------------------------- 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
