Tungsten (W) Back Catalog number: 57174 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 673653 Parathion-methyl, 10.0 µg/ml, Ethyl acetate, 10m Price on request 3348.7-100-CY Crimidine Price on request 32003 EPA Method 500 Series Internal Std #4 Price on request