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Re:[急問] 黃金口罩
關於口罩面具定義分類使用的資訊(英文)
http://www.cdc.gov/niosh/npptl/npptlrespfact.html
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為何用0.3微米顆粒測試?
http://www.cdc.gov/niosh/appndxe.html
The 0.3-micrometer diameter used in the certification testing is approximately the most penetrating particle size for particulate filters. Although it seems contrary to expectation, smaller particles do not penetrate as readily as 0.3-micrometer particles. Therefore, these respirators will filter all other particle sizes at least as well as the certified efficiency level.
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N,R,P級差別?
http://www.cdc.gov/niosh/2micron.html
The filter packaging of Part 84 particulate respirators contain certification numbers of the form TC-84A-XXX. Users can identify three types of filters with three efficiencies each as follows:
Respirators with N100, N99, and N95 filters (99.97%, 99%, and 95% efficient filters) may be used for any solid or non-oil containing particulate contaminant.
Respirators with R100, R99, and R95 filters (99.97%, 99%, and 95% efficient filters) may be used for any particulate contaminant. If used for an oil containing particulate, a one shift use limit applies.
Respirators with P100, P99, and P95 filters (99.97%, 99%, and 95% efficient filters) may be used for any particulate contaminant.
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To digiboy
"smaller particles do not penetrate as readily as 0.3-micrometer particles
(比0.3微米)更小的微粒穿透力不如0.3微米微粒那樣好
"a one shift use limit applies"
使用時間以輪一班(8小時)為限 |
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