Propionic acid isobutyl ester Back Catalog number: 71648 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 41121 EPA Method 624 Standard Price on request 93902 Trihalomethane Standard Price on request DF-IS-E200 Mass-Labelled PCDF Internal Standard Solution, 1.2ml, nonane Price on request