ISO 7326:2016规定了确定软管外盖耐臭氧性的五种方法: - 方法1，对于软管本身进行的直径大于25mm的孔径; - 方法2，用于从软管壁在试件上进行的大于25mm的孔径; - 方法3，对于大于25mm的孔径，从盖子在试件上进行; - 方法4，用于在软管本身上进行的所有孔尺寸; - 方法5，对于所有孔径，在可扩展的软管上进行，例如纺织加强软管。 注意对于内置配件的软管，无法从中获取试件，可根据ISO 1431-1对板材进行耐臭氧性评估，并使用硫化相同程度的合适聚合物的试片

ISO 7326:2016 specifies five methods for determining the ozone resistance of the outer covers of hoses: - method 1, for bore sizes up to and including 25 mm, carried out on the hose itself; - method 2, for bore sizes greater than 25 mm, carried out on a test piece from the hose wall; - method 3, for bore sizes greater than 25 mm, carried out on a test piece from the cover; - method 4, for all bore sizes, carried out on the hose itself; - method 5, for all bore sizes, carried out on hoses that are expandable, for example textile-reinforced hoses. NOTE For hoses with built-in fittings from which it is not possible to take test pieces, the ozone resistance can be assessed on slabs in accordance with ISO 1431‑1, using test sheets of the appropriate polymeric compound vulcanized to the same degree.