室温下，对 5μ m 滤纸在（ 90± 5）℃的烘烤箱中进行 60mi

室温下，对 5μ m 滤纸在（ 90± 5）℃的烘烤箱中进行 60min 烘烤后，在干燥器中冷却 30min，称重得重量 A。 往被测产品内腔充入内腔容积 60%左右的异辛烷或 CFC113，试验产品放在振荡台上以 300 次每分的频率振荡 3 min，然后把溶液倒出经滤纸过滤， 滤纸经相同温度、时间烘烤干燥后称重得重量 B1。如此反复烘干称重，直至连续两次差值≤0.1mg 为止，记录此次的重量 B，杂质含量=B-A（ mg）。 测量用工业分析天平，测量精度为± 1mg。用显微镜观察并测试残留杂质的颗粒的最大尺寸。

At room temperature, for 5 μ After baking the filter paper in an oven at (90 ± 5) ℃ for 60 minutes, cool it in a dryer for 30 minutes, and weigh it to obtain weight A. Fill the inner cavity of the tested product with about 60% isooctane or CFC113, and place the test product on an oscillation table to oscillate at a frequency of 300 times per minute for 3 minutes. Then, pour out the solution and filter it with filter paper. The filter paper is baked and dried at the same temperature and time, and the weight B1 is weighed. Repeat the drying and weighing process until the difference between two consecutive times is ≤ 0.1mg. Record the weight B of this time, with impurity content=B-A (mg). Industrial Analytical balance for measurement, with measurement accuracy of ± 1mg. Observe and test the maximum size of particles containing residual impurities using a microscope.

At room temperature, 5μ m filter paper was baked in a baking box at (90 5)℃ for 60min, then cooled in a dryer for 30min, and weighed to obtain a weight. Fill the inner cavity of the tested product with isooctane or CFC113, which accounts for about 60% of the inner cavity volume. Put the test product on an oscillating table and oscillate at the frequency of 300 times per minute for 3 min. Then pour out the solution and filter it with filter paper. After baking and drying the filter paper at the same temperature and time, weigh it to get the weight B1. Repeat this drying and weighing until the difference between two consecutive times is less than or equal to ≤0.1mg, and record the weight b this time, with impurity content =B-A( mg). Industrial analytical balance for measurement, the measurement accuracy is 1 mg. Observe and test the maximum size of particles of residual impurities with a microscope.