The principle of the dynamic test of the ozone aging test box: the vulcanized rubber sample is exposed to air with a constant ozone concentration under closed and non-illuminated conditions under continuous dynamic tensile deformation or alternating dynamic and static tensile deformation In a constant temperature test chamber, the sample is tested at a predetermined time, and the degree of cracking or other performance changes from the surface of the sample is evaluated to evaluate the resistance of the rubber to ozone aging.
The dynamic test standards of the ozone aging test chamber are also drawn as follows:
GB528 Determination of tensile properties of vulcanized rubber
GB / T 2941 Standard temperature, humidity and time for environmental adjustment and testing of rubber samples
GB 7762 vulcanized rubber ozone aging resistance test static tensile test method
Preparation of GB 9865 vulcanized rubber samples and tests
GB 11206 Vulcanized rubber aging surface crack test method Ozone aging test box dynamic test standard GB / T 13642-92 refers to the international standard ISO 1431 / 2-1982 "Vulcanized rubber-ozone crack resistance-Part 2: Dynamic strain test" The standard stipulates the test method for evaluating the aging resistance of vulcanized rubber under dynamic tensile deformation. It is suitable for the aging test of vulcanized rubber under dynamic tensile deformation, exposure to air with a certain concentration of ozone and a certain temperature without direct influence of light.
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The Centers for Disease Control and Prevention is recommending that health care workers treat it like an airborne pathogen - germs that can travel in particles or droplets in the air. That means health care workers interacting with a coronavirus patient should wear a heavy-duty mask called an N95 respirator. These respirators are designed to fit tightly around the nose and mouth, and, when worn correctly, block out at least 95% of small airborne particles, according to the CDC.
Masks
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