Filter Media
Filter media pore size comparison between porometry and glass bead challenge testing
Porometry has been used extensively for more than 25 years to assess pore size distributions of nonwoven filter media and their relation to filtration performance (Refs. 1, 2). There is even an ASTM procedure (F316) that describes the maximum pore size (bubble point), as well as the pore size distribution by measuring air flow at …
High-efficiency filters and laminar air flow systems needed in the battle against COVID-19
At the time of this writing, 800,000 people around the world have died from COVID-19. There have been 22 million reported infections. There is growing evidence that small aerosols are a major transmission source. Social distancing, inefficient masks, and MERV 8 filters are not a viable defense when dealing with a sub-micron enemy. Without some …
Filtration in the age of COVID-19
There are many different facemasks in the market today – from do-it-yourself cut and sew barrier masks to highly engineered products that require testing and certification to be used. In the age of COVID-19, the term “facemask” is, in some cases, being used generically, when there are different types of facemasks with varying degrees of …
Filter media players step up in the fight against COVID-19, but questions about the long-term supply persist
“The U.S. has a strategic petroleum reserve. It has strategic military assets. Where are the strategic meltblown assets?” This was the question with which Forbes investment specialist William Baldwin closed a column on April 3rd, immediately after U.S. President Donald Trump had issued a blistering attack on 3M during a press briefing in Washington. 3M …
Bekaert shows its mettle in filtration
The story of Bekaert started in 1880 in Zwevegem, a smaller rural village in Belgium, where local farmers were faced with the perennial problem of cattle showing the stubborn habit of straying beyond the boundaries of their fields and onto other people’s property. Leo Leander Bekaert translated this challenge into a business opportunity, starting up …