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One of the principal classes of flame retardants used in organic polymers is the phosphorus-compounds. In particular, inorganic phosphates have flame retardant properties of interest in thermoplastics. Ammonium phosphoric acids salts were first recommended two centuries ago and are still used today. However, new legislation is emphasizing the development of new flame retardant additives which are environmentally friendly. This paper reviews the different kind of inorganic phosphates used as flame retardants. It includes the use of red phosphorus, ammonium phosphates. We will also describe intumescent systems and low melting phosphate glasses.
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Duquesne et al. (1999) studied this question.
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