加载测试依据标准

Loading Test Procedure

加载测试能模拟长时间佩戴口罩衡量吸入足够颗粒后的过滤效率变化。

KN95口罩：85流量-加载200mg气溶胶颗粒

GB 2626—2019《呼吸防护用品 自吸过滤式防颗粒物呼吸器》

6.3.3   对加载量的要求

6.3.3.1   在检测过滤元件的过滤效率时，应在过滤元件上持续加载颗粒物，每个呼吸器过滤元件的累积 加载量以（200±5）mg颗粒物为基本要求。

欧洲FFP2口罩:95流量-加载120mg

欧洲口罩标准EN149-2001 (British standard)-Respiratory protective device -mask

EN 143-2007呼吸防护器.微粒过滤器检验标准进行检测

EN143-2007-Respiratory protective devices –Particle filters –Requirements, testing, marking

Test procedure
The test aerosol is fed into the test chamber, where the filter under test is fixed. A flow of 95 l/min is passed through the filter and the aerosol concentration is measured immediately before and after the filter by the photometer.
 Penetration shall be recorded throughout the test at sample intervals not exceeding 5 minutes.
— for filters being tested using paraffin oil, continue the test until the filter has been exposed to 120 mg of test aerosol.
 — for filters being tested using sodium chloride, continue the test until the filter has been exposed to 120 mg of test aerosol.

N95口罩:85流量-加载200mg

NIOSH 42 CFR Part 84 

Respiratory Protective Devices

呼吸保护装置法规

Tested to a specified maximum loading level (200 mg), the N- and R-series will be certified with the recognition that in some settings time-use limitations will apply.

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