Ozone resistance test and appearance inspection

7.9 Ozone resistance test

When testing in accordance with method 1 or Method 2 of GB/T24134-2009 (depending on the nominal inner diameter of the hose), magnify 2 times and check that there should be no cracking or other damage to the outer coating of the hose.

7.10 Appearance Check

There should be no visible defects in the outer adhesive of the hose. Check that the hose label is correct and properly marked. In addition, check that the hose assembly fittings are properly assembled.


We are a high-tech company engaged in research, development, production and sales. We have obtained API ISO9001:2008, API Spec Q1, ISO/TS29001 and API Spec 7K certifications. The safety mark certificate of mining products issued by the National Safety Mark Center of Mining Products.

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