How to formulate cost-efficient flame retardant transparent PC?

Potassium perfluorobutane sulfonate (KPFBS), such as FR-2025 from 3M or RM65 from Miteni, is a standard flame retardant for transparent polycarbonate. Even though used at a very small dosage, it is very expensive per se. For a thickness of 1.6 mm or below, KPFBS alone is not sufficient in FR efficiency and needs to be combined with a siloxane which is also expensive. As it is highly hygroscopic, the storage of KPFBS after opening its package is troublesome.

A siloxane alone without KPFBS can also be used to formulate a transparent PC, but at a relatively large amount. And this means high cost.

By contrast, the price of LC-160 is only a fraction of that of KPFBS and it needs to be used at a dosage similar to that of KPFBS. In transparent PC, LC-160 shows excellent synergy with either a siloxane or a phosphate ester FR which is much cheaper than a siloxane. LC-160 is not a sulfonate type FR and it is strictly halogen-free. Moreover, it is not hygroscopic at all, and really moisture-proof.

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