Roisin Reidy 01 Dec 2014 More in Pharmaceutical & Biotechnology A membrane with ‘on demand’ porosity, Freudenberg and GE: November’s top 3 news stories on www.FiltSep.com News 1. Membrane developed with ‘on demand’ porosity 2. Freudenberg Filtration Technologies buys MeadWestvaco’s air purification business 3. GE's new membrane technology