Volatile fluorohalogenoalkanes tend to disappear as they threaten the ozone layer. Fluoroalkanes replace them where possible and until they get banned too.
Gaseous fluorohalogenoalkanes can combat fires.
Volatile fluoroalkanes make good refrigerant fluids to replace flammable alkanes.
Solid (plastics) poly-etc are used as plain material and also as a thin antiadhesive coating.
I must forget a few thousands.