Method 1640Mix A Back Catalog number: 52146 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended B2729 4,4'-Bis(2-benzoxazolyl)stilbene, >97%, 25g Price on request 98681 Pesticides Calibration GC-MS/MS Price on request 59986 Metal Mix #2 Price on request