DS EN 16143:2013 Petroleum Products - Determination Of Content Of Benzo(A)Pyrene (Bap) And Selected Polycyclic Aromatic Hydrocarbons (Pah) In Extender Oils - Procedure Using Double Lc Cleaning And Gc/Ms Analysis Defines a procedure for the determination of the content of benzo[a]pyrene (BaP) in extender oils which are commonly used in the rubber industry for the production of tyres or parts of tyres.