Reeve Angel Brand Filter Papers Grade 202, 11 cm. Provides minimum filtration speed of coarse particles. The surfaced is creped, hence it has a greater true surface area than smooth surface filter paper of the same diameter.
Membrane circles white, 50 mm, mixed esters, 0.45 um, 3.1 mm black grid, sterile. In these products the microorganism counts are very low and are therefore determined quantitatively via enrichment methods.
White Sterile. Gridded, Without absorbent pad. Recommended for the majority of routine applications, this grade is manufactured under strictly controlled cleanroom conditions.
Black Gridded, Sterile. Whatman black and green mixed ester membranes are composed of cellulose acetate (-20%) and cellulose nitrate (-80%). These membranes are characterized by a smoother and more uniform surface than pure nitrocellulose filters.
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