Test principle
The instrument consists of two parts: the control box and the combustion box. The sample is clamped flat by the clamp and placed on the bracket of the combustion box. The flame is ignited by the control box for a certain time, and the flame is extinguished. Observe the flame spread of the sample, measure the time it takes for the flame to spread a certain distance on the sample, calculate the spread speed of the flame, and evaluate the flame resistance of the sample.