Official Journal of the Japan Wood Research Society
Table 3 Prescribed minimum time to pass the tests
From: Relative improvements in flame resistance of coir fiberboards treated with fire-retardant solution
Test as per IS 1734: Part 3 (1983) [16] | Prescribed minimum time as per IS 5509 (2000) [17] |
|---|---|
Flammability Time taken for second specimen to ignite after the first, lower specimen ignites | Not less than 30 min |
Flame penetration Time taken for flame penetration from bottom to top surface | Not less than 15t/6 = 30 min where thickness of sample, (t) = 12 mm |
Rate of burning Time taken for weight to decrease from 70 to 30% | Not less than 20 min |
Test as per IS 15,491 (2004) [14] | Prescribed minimum time as per IS 15491 (2004) [14] |
Resistance to spread of flame Time taken for the specimen to be ignited and of sustained burning | No minimum time prescribed for ignition, but no burning after ignition shall continue for more than 20 s |