Effect of aging time of gas aging test chamber on products
In general, rubber properties are characterized by an exponential type over time, and their performance declines rapidly over the first period of time, after which the performance changes are relatively flat and last longer. If the accelerated aging time is too short, the aging characteristics of the first stage of the material will be used instead of the aging characteristics of the whole process, resulting in a conservative prediction result; if the sampling interval is too long in the test of the ventilation aging test chamber, The gradient of the adjacent number change is too large, causing the accelerated aging curve derived from these data to seriously deviate from the actual accelerated aging curve, thereby distorting the prediction result.
Therefore, during the test of the ventilation aging test chamber, the test termination time must be considered. The performance of the material is attenuated to a certain extent and does not meet the requirements of use. The material properties at this time are its critical value. In general, people are concerned about the performance change of the material before reaching the critical value. Therefore, it is advisable to test the time to a later time or a little longer. As for the sampling time interval, according to the aging characteristics of the rubber material, the sampling interval after the start of the test should be shorter, and then can be appropriately lengthened. The general principle is that the performance variation gradient should not be too large, generally not more than 10%.
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