NF EN 27326

<p>ISO 7326:2006 specifies five methods for determining the ozone resistance of the outer covers of hoses:</p> <ul><li>method 1, for bore sizes up to and including 25 mm, carried out on the hose itself;</li><li>method 2, for bore sizes greater than 25 mm, carried out on a test piece from the hose wall;</li><li>method 3, for bore sizes greater than 25 mm, carried out on a test piece from the cover;</li><li>method 4, for all bore sizes, carried out on the hose itself;</li><li>method 5, for all bore sizes, carried out on hoses that are expandable, for example textile-reinforced hoses.</li></ul>