Johnson Johnson Glass Filter Paper, 50C047, Microfibre, Grade 50C, 0.27MM Thk x 47MM Dia, White, 100 Pcs/Pack Johnson Test Papers' Grade 50C is a standard grade glass filter found in many environmental applications offering a smaller pore size than 50A (1.2 µm), with a slightly slower filtration speed. The... Quick view Qty in Cart: 0 Price: Log in for pricing and quote Subtotal: