div class=trans-pagebutton class=gotoPage data-page=1Page 1button div class=trans-imageimg data-url=documentpowerpoint-our-astm-level-3-face-masks-are-constructed-of-four-layers-for-protectionhtmlpage=1 data-page=1 class=trans-thumb lazyload alt=Page 1: PowerPoint Presentation · Our ASTM level 3 face masks are constructed of four layers for protection comfort and breathability Layer 4— soft non-abrasive inner layer makes the loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mM8Uw8AAh0BTZud3BwAAAAASUVORK5CYII= data-src=https:reader034fdocumentsusreader034viewer2022051918600ace64b82983772323a855html5thumbnails1jpg width=140 height=200 divdivdiv class=trans-pagebutton class=gotoPage data-page=2Page 2button div class=trans-imageimg data-url=documentpowerpoint-our-astm-level-3-face-masks-are-constructed-of-four-layers-for-protectionhtmlpage=2 data-page=2 class=trans-thumb lazyload alt=Page 2: PowerPoint Presentation · Our ASTM level 3 face masks are constructed of four layers for protection comfort and breathability Layer 4— soft non-abrasive inner layer makes the loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mM8Uw8AAh0BTZud3BwAAAAASUVORK5CYII= data-src=https:reader034fdocumentsusreader034viewer2022051918600ace64b82983772323a855html5thumbnails2jpg width=140 height=200 divdivdiv class=trans-pagebutton class=gotoPage data-page=3Page 3button div class=trans-imageimg data-url=documentpowerpoint-our-astm-level-3-face-masks-are-constructed-of-four-layers-for-protectionhtmlpage=3 data-page=3 class=trans-thumb lazyload alt=Page 3: PowerPoint Presentation · Our ASTM level 3 face masks are constructed of four layers for protection comfort and breathability Layer 4— soft non-abrasive inner layer makes the loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mM8Uw8AAh0BTZud3BwAAAAASUVORK5CYII=...