ISO 7233:2016规定了由塑料或橡胶制成的软管和软管组件的真空阻力的三种方法。每种方法的软管适用尺寸如下: - 方法A用于名义孔径至80mm的软管; - 公称孔径大于80 mm的软管的方法B; - 所有尺寸软管的方法C。 方法A和B还可用于检查衬套与一段硬壁软管或软管组件中的钢筋（分层）的粘合性

ISO 7233:2016 specifies three methods for determining the resistance to vacuum of hoses and hose assemblies manufactured from plastic or rubber. Applicable dimensions of hoses for each method are as follows: - method A for hoses of nominal bore up to and including 80 mm; - method B for hoses of nominal bore greater than 80 mm; - method C for hoses of all dimensions. Methods A and B can also be used to check the adhesion of the lining to the reinforcement (delamination) in a length of hard-wall hose or hose assembly.