CLP Calibration Standard Back Catalog number: 53155 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended XA15987120ME Perfluorooctane sulfonic acid, 100 ng/µl, 1ml Price on request 90799 Phthalic anhydride Price on request 95053 EPA Method 527 Surrogate Standard Price on request