In a Method B ignition test, burns after the initial burn must be at least how many minutes?

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Multiple Choice

In a Method B ignition test, burns after the initial burn must be at least how many minutes?

Explanation:
In a Method B ignition test, after the initial burn you need to keep the sample burning for a defined minimum period to ensure complete combustion of the combustible components and to produce repeatable, comparable results. This minimum time is chosen so that all volatiles are driven off and the flame remains stable across tests. If the burn ends too soon, ignition may be incomplete and the test result unreliable. The procedure specifies this minimum duration, and longer burns aren’t required by the standard. So the correct choice is the option that matches the method’s defined minimum burn time.

In a Method B ignition test, after the initial burn you need to keep the sample burning for a defined minimum period to ensure complete combustion of the combustible components and to produce repeatable, comparable results. This minimum time is chosen so that all volatiles are driven off and the flame remains stable across tests. If the burn ends too soon, ignition may be incomplete and the test result unreliable. The procedure specifies this minimum duration, and longer burns aren’t required by the standard. So the correct choice is the option that matches the method’s defined minimum burn time.

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