KS R ISO 4548-4-2007(2022) 内燃机全流量润滑油过滤器试验方法第4部分:初始颗粒保留效率、寿命和累积效率（重量法）
Methods of test for full-flow lubricating oil filters for internal combustion engines－Part 4：Initial particle retention efficiency, life and cumulative efficiency(gravimetric method)