David and Gary - Gary has the name correct, but the difference in rating is derived due to complications related to the test method. VTM materials tend to curl up, wilt or shrink away from a flame when cut into test blanks normally used for the V-x small scale material testing. To overcome this, the test samples are formed into cylinders by wrapping them around a mandrel, to stiffen them. The samples are oriented the same as for the V-x testing and the mandrel is removed prior to applying a flame.
Since the test methods are different and not directly comparable, the VTM rating scheme was devised. In VTM-x, the -x part of the rating is roughly comparable to V-x ratings and are generally treated as equivalent. Regards, Peter L. Tarver, PE Product Safety Manager Sanmina-SCI Homologation Services peter.tar...@sanmina-sci.com > -----Original Message----- > From: Gary McInturff > Sent: Friday, March 08, 2002 6:52 AM > > Vertical thin material. The first part is the > orientation of the test sample just as is 94 VX > and the second part TM identifies thin material. > Its thin enough that if used on its own it to > would burn, but when used attached to someother > surface it will not burn. Mostly I've sen it in > tapes etc. If I remember correctly it has to be > tested mounted to a madril of some sort to > determine is ratings. > Gary > -----Original Message----- > From: Gelfand, David [mailto:david.gelf...@ca.kontron.com] > Sent: Thursday, March 07, 2002 2:06 PM > > What does UL 94 VTM-0 mean? I saw it in a spec > for thin insulating plastic. > > > Thanks, > > David. > > David Gelfand > Regulatory Approvals > Kontron Canada Inc. ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
