A substance or chemical treatment applied to materials to make them resistant to burning or catching fire.
From 'flameproof' plus the suffix '-er,' creating an agent noun for the substance that performs the action of flame-proofing. This term emerged as fire-resistant treatments became commercialized in the 20th century.
Some flameproofers work by forming a protective layer that insulates the fabric from heat, while others actually change the chemical structure of the material so it releases water vapor instead of flammable gases when heated.
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