This test method covers the determination of trace impurities in 4,4 -Isopropylidenediphenol (BPA) by inverse gradient high performance liquid chromatography (HPLC).This method is applicable to BPA samples containing impurity concentration of 2 to 400mg/kg.

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Rationale

BPA is used for production of polycarbonate or epoxy resin. The presence of impurities in BPA is undesirable because they may slow down the polymerization and be impurities in the final product. Determination of the trace impurities, such as isomer of BPA and the unreacted raw material, is often required. This test method is suitable for setting specifications and for using as an internal quality control where these products are produced or used