It means it protects from the fire. That rejects or avoids combustion. That does not burn or ignite. Firemen's coveralls and car runners are made of fire retardant material.
Flame retardant-refers to the expression: substance used to prevent combustible materials fire
ignifugo:benefactor against the fuego.refractario. fireproof. indestructible. unshakable.
Not flammable and propagator of fire
material for the chemistry of combustion reaction does not produce flames