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The surface-coated ammonium polyphosphate (APP@PD) was produced by first synthesizing a linear vinyl polysiloxane (PD) and subsequently self-crosslinking it using benzoyl peroxide. The self-crosslinking mechanism of linear vinyl polysiloxane coatings, employed here, presented a unique contrast to the more prevalent sol-gel coating method used on APP substrates with silane monomers. Following the application of the coating, the water contact angles (WCA) for APP and APP@PD register