EPA 1620 Standard 1 Back Catalog number: 53139 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 679142 N-Phenylurea, 500mg Price on request 1549.18-K-IOX10 n-Octadecane-d38, 1000µg/mL, Solvent-isooctane, Unit 1mL, # of units-10, Cas.no. 16416-31-2 Price on request 2437.19-K-IO 2-n-Dodecyl-p-cresol, 1000µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 25912-91-8 Price on request