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Classifications of the burning behavior according to KS M ISO 9772.
| Criteria Conditions | V-0 | V-1 | V-2 |
|---|---|---|---|
| After-flame time for each individual specimen | ≤10 s | ≤30 s | ≤30 s |
| Total after-flame time for any condition set | ≤50 s | ≤250 s | ≤250 s |
| After-flame plus after-glow time for each specimen after the second flame application | ≤30 s | ≤60 s | ≤60 s |
| After-flame or after-glow of any specimen up to the holding clamp | No | No | No |
| Cotton indicator ignited by flaming particles or drops | No | No | Yes |
