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Opti-Fluor is a universal, safer liquid scintillation cocktail based on the high flash-point solvent Linear Alkylbenzene (LAB). Opti-Fluor does not show any diffusion through the walls of polyethylene vials as observed with many LSC cocktails containing toluene, xylene or pseudocumene. This ensures economical use with PerkinElmer’s polyethylene vials.