Some years ago, I sought to see the differences between the ratings, V0, V1, and V2. The V stands for a test of a vertical oriented specimen. HB stands for a test of horizontal burning oriented specimen. As I recall, the HB rating was based on the rate of burn, less than 40 mm per minute, for the horizontal oriented specimen. HB material burns until it is consumed. V-rated material self-extinguishes at some time after ignition. Based on UL 94, I put together the attached chart to determine the V0, V1, and V2 differences. Note that the only difference between V1 and V2 is that V2 has flaming drops. Best wishes for the Thanksgiving holiday, Rich - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to [email protected] All emc-pstc postings are archived and searchable on the web at: https://www.mail-archive.com/[email protected]/ Website: https://ewh.ieee.org/soc/pses/ Instructions: https://ewh.ieee.org/soc/pses/list.html (including how to unsubscribe) List rules: https://ewh.ieee.org/soc/pses/listrules.html For help, send mail to the list administrators: Mike Sherman at: [email protected] Rick Linford at: [email protected] For policy questions, send mail to: Jim Bacher: <[email protected]> _________________________________________________ To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1
UL94d.pdf
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