Phosphorus

Acting principle: formation of a solid surface layer of phosphorus compounds:

Formation of a protective layer by the production of polyphosphoric acid and carbonization, e.g. by release of water.
Further examples:

Resorcinol diphosphoric acid tetraphenyl ester
(RDP)

Ammonium polyphosphate
(APP)

Phosphine acid derivatives

Triaryl phosphates

Trichloropropylphosphate
(TCPP)

Red Phosphorus
