BS EN ISO 7326:2016

What is ISO 7326 – Resistivity of atmospheric ozone on rubber and plastic hoses about ?

ISO 7326 is an international standard used for rubber and plastic hoses that specifies the test method which helps in resisting the atmospheric ozone on these hoses.  

ISO 7326 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. 

Who is ISO 7326 - Resistivity of atmospheric ozone on rubber and plastic hoses for ?

ISO 7326 on rubber and plastics hoses is useful for: 

• Chemical industries 
• Manufacturers of hoses 
• Oil refineries 
• Gas refineries
• Biotechnical industries 
• Pharmaceutical companies 
• Biochemical companies 

Why should you use ISO 7326 - Resistivity of atmospheric ozone on rubber and plastic hoses ?  

ISO 7326 specifies the test method, test procedure and test requirements for rubber and plastic hoses. This test method is useful in determining the resistivity of these hoses when it is exposed to the atmospheric ozone under static conditions.  

Using ISO 7326 you can ensure the sustainability of these hoses in different conditions. By applying ISO 7326 best practice guidelines, you can manufacture good quality hoses which helps in resisting atmospheric ozone.  

What’s changed since the last update ?  

BS EN ISO 7326:2016 supersedes BS EN ISO 7326:2008. BS EN ISO 7326:2016 includes some technical changes with respect to BS EN ISO 7326:2008. These include: 

• In Clause 2, the latest edition of ISO 1431-1 has been cited 
• 5.5 and 9.4.1 have been amended 
• In 6.1.1, the formula has been amended