This standard specifies a gas chromatograph detection method for the content of benzene series (benzene, toluene, Xylene) and diisocyanate monomers (toluene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate and diphenylmethane diisocyanate) in solvent-based paints. This method uses an inert polytetrafluoroethylene (PTFE) membrane to filtrate Coating samples and then analyze them using capillary tubing Chromatography. Reagent and material requirements include the use of analytically pure reagents, with a particular requirement that ethyl acetate be treated after dehydration.