In a message dated 6/19/2003 2:46:15 PM Eastern Standard Time, drcuthb...@micron.com writes:
> Doug, > > I believe that 94V-0 indicates that the board is self-extinguishing. How about lighting it with a flame, or a glowing PCB trace, and then remove the flame. The board fire should go > out. > > Dave That won't tell you whether it's V-0 or not. All vertical rated boards (V-0, V-1, V-2) are self-extinguishing. To be a V-0 material, the laminate must self-extinguish in the vertical position without any flaming drip within a certain period of time under very controlled conditions including a calibrated flame size using a fixed caloric content burner fuel, etc. There's no way to self-test it and make a determination. UL does some elaborate fingerprinting and surveillance control on the materials, with the intention that manufacturers, along with UL end-product testing engineers, can rely on their plastics Follow-Up Service program for this very purpose. I also concur with Pete Tarver's remarks regarding the other conditions specific to printed wiring boards which may or may not affect the overall flammability performance of the finished board. Greg Galluccio Global Advantage International www.globaladvantage.ca 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: emc_p...@symbol.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
