Whatman 10401612 Mixed Cellulose Ester Circle ME Range (ME 25), plain, 0.45 um pore size, 47 mm, 100 per pack. Regular Price: $131.08. Price $113.98. Add To Cart. Whatman 10406814 Mixed Cellulose Ester Circle ME Range (ME 25), white/black grid 3.1 mm, 0.45 um pore size, 50 mm, 100 per pack.