This standard specifies the requirements, sampling, test methods, inspection rules, marking, packaging, transportation, storage and safety of o- and p-nitrochlorobenzene. This standard applies to the product quality inspection of o- and p-nitrochlorobenzene. The product is mainly used in the dyestuff, pesticide and pharmaceutical industries. Molecular formula: C6H4ClNO2 Structural formula: slightly relative molecular mass: 157.56 (according to the international relative atomic mass in 2005)