1. Conduct UV Aging Test for Rubber Hose
UV rays are a main cause of rubber hose aging. First, cut a small sample from the rubber hose. Place the sample in a UV aging chamber. Set the chamber to 60°C and 0.8W/m² UV intensity—these mimic outdoor summer conditions. Let the sample run for 168 hours (7 days). Afterward, check the sample: if it turns brittle, fades, or develops small cracks, the rubber hose has poor UV aging resistance. If it stays flexible and retains its original color, the aging resistance is good.
2. Perform Thermal Aging Test for Rubber Hose
High temperatures speed up rubber hose aging. First, take another rubber hose sample. Put it in a constant-temperature oven. Set the oven to 80°C—this simulates long-term use in hot environments. Leave the sample for 240 hours. Once done, take out the sample and cool it to room temperature. Pull the sample gently: if it stretches less than 50% of its original length, the rubber hose has weak thermal aging resistance. If it stretches normally and doesn’t break, it resists thermal aging well.
3. Do Humidity Aging Test for Rubber Hose
Moisture also causes rubber hose aging, especially for outdoor hoses. First, cut a third rubber hose sample. Place it in a humidity chamber. Set the chamber to 40°C and 95% relative humidity—this mimics rainy or humid areas. Let the sample test for 192 hours (8 days). After the test, wipe the sample dry. Press the sample with your finger: if it feels sticky (from plasticizer leaching) or softens too much, the rubber hose has poor humidity aging resistance. If it stays firm and non-sticky, it holds up well against moisture-related aging.