PSA-Mix 9 Back Catalog number: 680494 Manufacturer: HPC STANDARDS GmbH Availability: In the manufacturer's stock Price on request - + Recommended 19267 EPA Method 502/524 Surrogate Standard #2 Price on request 0918.14-500-IO 2,4-Dimethyldibenzothiophene, 500µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 31317-18-7 Price on request 70055 sec-Butyl benzene Price on request