ISO 6257:2002规定了铝电解生产用电极制造中使用的粘结剂沥青试验前取样和制备样品的方法。 这些方法适用于液体或固体形式的沥青等级，后者的软化点高于30°C（根据ISO 5940中规定的方法测定），散装，或在制造、储存或交付现场组成一批的多个容器中。其中包括在船舶装卸过程中，大量液体沥青的抽样方法和抽样计划。

ISO 6257:2002 specifies methods for sampling and preparing samples prior to testing of binder pitch used in the manufacture of electrodes for the electrolytic production of aluminium. These methods are applicable to grades of pitch in liquid or solid form, the latter having softening points higher than 30 °C (determined according to the method specified in ISO 5940), in bulk, or in a number of containers making up one batch at sites of manufacture, storage, or delivery. Sampling methods and sampling plans for large consignments, or lots, of pitch in liquid form during the loading and unloading of ships are included.