EPA 1620 Standard 4 Back Catalog number: 53142 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 31070 EPA Method 502/524 Surrogate Standard #3, 2000µg/ml in MeOH, 1ml Price on request 72472 Pyriproxyfen Price on request 677926 Sulfotep, 100 µg/ml, Ethyl acetate, 1ml Price on request