Tris(chloropropyl) phosphate (commonly abbreviated TCPP) is a chlorinated organophosphate flame retardant commonly added to polyurethane foams.

[1] Comparatively minor amounts are used in PVC and EVA.

[2] TCPP is prepared industrially by the reaction of propylene oxide with phosphoryl chloride.

In practise this produces a range of products, of which the tris(2-chloro-1-methylethyl) isomer tends to dominate (50-85% w/w).

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