6. Esmolol HCL Cas:81161-17-3 Appearance; white or off-white color crystalline power Assay; exceed or equal 98.5% Identification: complies Acidity: 2.5~4.5 Color and clarity of solution: complies Sulfate: complies Related substance: complies Loss on drying: less than or equal 0.5 percent Residue on ignition: less than or equal 0.1 percent Heavy metals: less than or equal 20ppm Acceptance standard: national standard Package: 25 kg/barrel Capacity: five hundred kg/month