Two common accelerated aging tests for rubber

Two Common Accelerated Aging Tests for Rubber We know there are several test methods for accelerated aging test: oven accelerated aging test, oxygen bomb accelerated aging test, air bomb accelerated aging test, artificial weather accelerated aging test, hygrothermal aging test, ozone Accelerated aging test, salt spray corrosion test, artificial anti-mildew test and so on. Among them, the oven accelerated aging test and hygrothermal aging test are the two most commonly used accelerated aging test methods. Today we talk about the characteristics of these two accelerated aging test methods.

The relevant equipment for accelerated weathering of ovens includes blast drying ovens, vacuum drying ovens, ventilation aging test boxes, etc. These devices are mainly aimed at the thermal oxygen aging of some materials under storage conditions (and of course, also for drying). The test is a method in which a test sample is suspended in a heat aging test box under specified conditions (such as temperature, wind speed, etc.), and the appearance and performance of the test sample are periodically checked and measured to evaluate the heat resistance thereof. Ways. This test method is mainly used to determine the storage properties of some vulcanizates. The oven accelerated aging test is intuitive and simple, and it is close to the actual process. In some cases, the accuracy of the results is acceptable. The national standard standardized the test method and formulated GB/T 17782 "Vulcanized Rubber Pressure Air Heat Aging Test Method" and GB/T3512 "Vulcanized Rubber or Thermoplastic Rubber - Hot Air Accelerated Aging and Heat Resistance Test".

Another common accelerated aging test method is the hygrothermal aging test. There are several types of test equipment related to it: constant temperature and humidity test chambers, high and low temperature damp heat test chambers, and high and low temperature impact test chambers. The deterioration of rubber due to moisture and heat is mainly manifested in the penetration of water vapour into rubber and the acceleration of this penetration by heat. It exposes the test sample to a moist hot air environment, through the action of hot air and water vapor, according to regulations. The time to test the performance changes of the sample to assess the resistance to heat and humidity aging properties of rubber. Hygrothermal aging test conditions must be determined according to the material properties, conditions of use and test objectives, and then set the relevant test conditions according to the test equipment parameters. The hygrothermal aging test is closer to the actual situation than the data measured by the accelerated aging test of the oven, because the aging of outdoor materials is not only affected by the temperature conditions, but the humidity of the environment is also very obvious for rubber aging. Its Chinese standard GB/T l5905 “Vulcanized and Heated Weathering Test Method for Vulcanized Rubber” has explicit regulations. When customers set test condition parameters, they can refer to the standard for testing.

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