2. Test conditions: the above materials shall be tested at constant temperature and humidity (temperature: 23 ± 2 ℃, humidity: 45-70%) for more than 2h, subject to Zhanxin test method.
2. Test conditions: The above materials shall be tested at a constant temperature and humidity (temperature: 23 2℃ humidity: 45-70%) for 2 hours or more, and the test method of Zhanxin shall prevail.