橡胶和塑料软管静态条件下耐臭氧-评估(ISO 7326:2016)

[中文适用范围]： 本文件规定了测定软管外层耐臭氧性的五种方法： 方法1：对于内径不超过25mm，在软管本身上进行；方法2：对于内径超过25mm的，在软管壁上的试样上进行；方法3：对于内径大于25mm的情况，在外层制成的试样上进行；方法 4：对于所有内径，在软管本身上进行；程序 5：对于所有内径，在可膨胀管上执行，例如B. 在织物增强软管上。 注：对于带有内置软管接头且无法取样的软管，可使用适当的聚合物共混物和 ISO 1431-1 板上相同硫化程度的测试片来测定耐臭氧性。 [外文原描述]： 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.