Class C Masking - Low temperature testing should be conducted on Class C Masking. After placing the test object in air at a temperature of (-40 ± 3) ℃ for 4 hours, perform the simulated assembly test in 7.3.6 on the test object. 8.5W type shielding cover - High temperature test should be conducted on the W type shielding cover. Place the test object in air at a temperature of (70 ± 3) ℃ and a relative humidity of 93% for 4 hours, and perform the simulated assembly test in 7.3.6 on the test object. Type Z Masks - Ozone Resistance Test - Type Z Masks should undergo an ozone resistance test. This test is not required for level 0 masks. The ozone resistance test can be conducted using one of the following two methods. If there is a dispute, use Method A for testing. 8.6.1 Method A: Cut 12mm from the Z-type shielding cover × A 100mm sample is stretched for 20% and placed in a constant temperature oven at (40 ± 2) ℃ for (8 ± 0.5) h. The ozone concentration in the oven is (1 ± 0.01) mg/m at standard atmospheric pressure (101.3kPa). After removal, there should be no cracks on the test sample for visual inspection. The size of the metal round rod used in Method B test should comply with the provisions in Table 4. Bend the metal rod at 90 ° with a radius of curvature of 78mm. After the shielding cover is arranged on the metal rod, wrap the metal outer electrode around the raised part of the shielding cover. Refer to 7.4.3.1, ground the inner electrode, and apply a 15kV voltage to the outer electrode for 1 hour. After pressurization, perform a visual inspection. If there are no obvious cracks on the test sample, the test is passed
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