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+34 91 337 60 00PETRELAB® 550, Linear Alkylbenzene (LAB), is the result of alkylating benzene with n-olefins using an appropriate catalyst. Commercial LAB is a blend of C10–C13 homologues with all positional isomers except 1-phenyl. High 2 phenyl isomers content (25-30%). Detal Technology.