The procedure for conducting an ozone aging test on vulcanized rubber using an ozone aging test chamber is as follows:
First, ensure that the sample's initial condition, including its thickness, is intact and suitable for testing. Using a non-toxic pigment, draw reference lines on the surface of the sample to mark the area to be monitored during the test. Secure the sample onto the test frame and stretch it to the required elongation percentage. It is important to keep samples with different formulations separate, maintaining a minimum distance of 5 cm between them to avoid cross-contamination. Apply an ozone-resistant coating or use an ozone-protective material on the ends of the specimen near the clamping area, and consider additional protective measures if necessary. Allow the sample to rest in a dark, ozone-free room at standard temperature (e.g., 23 ± 2°C) for 24 to 48 hours before proceeding.
Next, activate the ozone aging test chamber and adjust the internal temperature to the desired test temperature. Once the chamber reaches the target temperature, place the stretched sample inside and allow it to undergo a 15-minute pre-conditioning heat treatment. Afterward, introduce ozone-containing air into the chamber at the specified concentration and flow rate. Begin timing the exposure period once the ozone is introduced.
During the test, regularly inspect the sample’s surface using a magnifying glass with 4x to 7x magnification through the transparent viewing window installed in the chamber. Alternatively, remove the sample from the chamber for visual inspection or perform performance tests as needed. The evaluation of ozone resistance is based on observed surface changes such as cracking or discoloration. It’s important to note that results obtained using different tools or methods may not be directly comparable.
This detailed process ensures accurate assessment of the material’s resistance to ozone degradation under controlled conditions.
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