Boric Acid → Orthoboric acid, compound with 1,3,5-triazine-2,4,6-triamine (1:1)

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A method for producing melamine borate particles, which comprises maintaining a mixture of boric acid and melamine at a temperature (T) of from 0 to 200° C., in an atmosphere containing steam so that the relative humidity (Ψ) is at least 5%, for a retention time (t) within a range of from 1 to 100 hours, and under a condition that satisfies a formula (T-60)≥-20·log10 (t/4)+(Ψ-100)2 /20, to form melamine borate particles as defined in above item 1 or a mixture containing them.

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