Combustion method:

Nylon: The flame quickly curls and melts into a white gel, igniting droplets and foaming in the flame. When burning, there is no flame, making it difficult to continue burning without the flame, emitting a celery smell. After cooling, the light brown molten material is not easily crushed.

Polyester: Easy to ignite, it melts and shrinks near the flame. When burning, black smoke is emitted while melting. The flame is yellow and emits a fragrant odor. After burning, the ash becomes a black brown hard block that can be crushed with fingers.

Polypropylene: It melts and shrinks near the flame, is easy to burn, burns slowly and emits black smoke away from the flame. The upper end of the flame is yellow, and the lower end is blue, emitting a smell of petroleum. After burning, the ash becomes hard round light yellow brown particles, which are easily crushed when twisted by hand.