Patent ID: 6277777
Filing Date: 2001-08-21
Classification: B01D,C03C,Y10T

Abstract:
A substantially boron-free fiberglass HEPA air filtration media comprising a paper of glass fibers comprising the following by mole percent:62-68% SiO.sub.2 2-6% Al.sub.2 O.sub.3 10-16% Na.sub.2 O 0-6% K.sub.2 O 0-6% Li.sub.2 O 3-10% CaO 0-8% MgO 0-3% BaO 2-6% ZnO 0-2% TiO.sub.2 0-2% F.sub.2wherein the total amount of Na.sub.2 O and K.sub.2 O is less than 18 mol %, and with the glass composition of the glass fibers having an HTV of between about 1850.degree. F. and about 2200.degree. F., and a liquidus temperature of at least 250.degree. F. below said HTV.