Freon Standard Back Catalog number: 96694 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 93188 EPA Method 528 Internal Standard Price on request 681952 Heptenophos, 10.0 µg/ml, Acetone, 10ml Price on request 683391 4-Methylbenzophenone, 1000mg Price on request