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A durable flame retardant finish for cotton is usually based on

  • A.a phosphorus compound bound to the fibre
  • B.a simple borax and boric acid mixture
  • C.a silicone based emulsion finish
  • D.a cationic softener based finish

Answer: A

The phosphorus promotes charring rather than flaming combustion and survives repeated laundering. Borax systems work but wash out, so they suit only disposable or rarely washed articles. Durability is what the phosphorus systems add.

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