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Analysis of Technical Diphenylolpropane (Bisphenol A) by High‐performance Liquid Chromatography A method for the investigation of technical 2,2‐bis‐(4′‐hydroxyphenyl)‐propane (bisphenol A) by high‐performance liquid chromatography is described. Microspherical silicagel in unmodified (adsorption) and C16‐modified form (reversed phase) was used as support. It has been found that supports with small particle sizes (5 μm) achieve their optimum efficiency only when they possess an adequately narrow optimum particle size distribution. The investigations were carried out using a self‐made apparatus. Details concerning an UV‐cell being insensitive to gas bubbles as well as a differential refractometer, which can be disassembled, are presented.