PP 濾材的 MPPS

下面這家廠商口罩是採用帶靜電濾材，材質為不織布，猜測應該就是 PP (聚丙烯) 熔噴不織布。

天天防護口罩 - 天天防護口罩檢驗報告 - 專利報告
可以看到底下的該公司不織布材質濾材的 "EN 1822(European Standard EN1822)「HEPA濾材檢測報告」"
廠商宣稱的 E10 濾材 MPPS 為 0.07μm
廠商宣稱的 E11 濾材 MPPS 為 0.04μm
廠商宣稱的 E12 濾材 MPPS 為 0.07μm
全部的 MPPS 都是低於 0.1μm。蠻想知道 0.3μm 下的穿透率說 @_@

個人是覺得紡綜所應該是沒依 EN1822 規定用 IPA 消靜電後才測試...

與過去所認知的 MPPS (最易穿透粒徑) 是 0.3μm，或者更正確是 0.1～0.3μm 之間的這個觀念，似乎並不適用於倚賴靜電的 PP 材質濾材。

更新

SCP Meltblown Team - 「熔噴布」 成國家隊量產關鍵 不只口罩 更是時尚民生必需品

>熔噴布與一般布料不同，除了口罩，它其實有更多「用武之地」；其布料特性與塑膠類似，包括過濾、疏水親油、耐熱特色。

>熔噴布原料聚丙烯（PP）只要經過特殊處理，其保溫性甚至能比羽絨衣要好，特別適合做成滑雪服、登山服、睡袋等保暖衣物。由於熔噴布能夠過濾空氣，因此你房間的空氣清淨機上的濾網，也是由熔噴布製成

MANN+HUMMEL Air Filtration - EN 1822

>EN 1822

>高效空气过滤器的测试方法

ACS Publications - American Chemical Society - Examination of Nanoparticle Filtration by Filtering Facepiece Respirators During the COVID-19 Pandemic (PDF)

>The introduction of electrostatic charges has been found to improve the filtration efficiency in the intermediate particle size range and to reduce the MPPS down to less than 100 nm.

US National Library of Medicine - WHAT DOES RESPIRATOR CERTIFICATION TELL US ABOUT FILTRATION OF ULTRAFINE PARTICLES?

>Additionally, the most penetrating particle size for electret filters likely occurs at 100 nm or less under test conditions similar to those used in filter certification. 

Taylor & Francis Online: Peer-reviewed Journals - Penetration of Sub-50 nm Nanoparticles Through Electret HVAC Filters Used in Residence

> The MPPSs were found to be ranged 20–50 nm for electret filters (Bałazy et al. 2006; Li et al. 2012; Stephens and Siegel 2013). 

>The efficiency for the 3 nm nanoparticles was higher than 99.993% while the efficiency was only slightly decreased to 95.2% for 20 nm particles.