The burn-up rate describes the maximum propagation speed of the burn zone of solids.
Guideline 92/ 69/ EWG
The burn-up rate of a 25 cm long pouring ignited at one end with a gasflamme is measured over a temporally seized length of 10 cm.
The combustibility index is similar to the burn-up rate a criterion for the behaviour in case of fire.
The characteristic is relevant for the marking after dangerous material and danger property right.