Table 3.

Classification of UL-94 V testing.

UL-94 Vo	Each specimen must have the first flame (t1) and the second flame (t2) less than 10 s. The total time for the first and second flames (t1 + t2) across all five specimens must be less than 50 s. Additionally, the second and third flames (t2 + t3) must be less than 30 s for each specimen. There should be no after-flame or afterglow up to the holding clamp, and no burning drops are allowed.
UL-94 V1	Each specimen must have t1 and t2 less than 30 s. The total time across all five specimens must be less than 250 s. Additionally, the t2 and t3 flames (t2 + t3) must be less than 60 s for each specimen. There should be no after-flame or afterglow up to the holding clamp, and no burning drops are allowed.
UL-94 V2	Each specimen must have t1 and t2 less than 30 s. The total time (t1 + t2) across all five specimens must be less than 250 s. Additionally, the second and third flames (t2 + t3) must be less than 60 s for each specimen. There should be no after-flame or afterglow up to the holding clamp, but burning drops are allowed.