Fisher Scientific Whatman Filter Paper 70 mm Diameter, Circle, Cellulose Fiber, Grade 4, Qualitative, No 4, Particle Retention: 20-25 µM, Porosity: Coarse, Filtration Speed: Herzberg, 37 sec - 09825A Packaging:Pack of 100 Manufacturer # : 25000-006 31620- Mechanical Timer To avoid over treatment Pakaging:100 Per Box
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