General purpose schools grade, smooth General purpose schools grade, creped The most widely used general purpose paper Slightly thicker and more retentive than No. 1 As No. 2 but supplied prepleated Double the thickness of No. 1
precipitates
Will retain fine precipitates, grained surface Faster than No. 5 but almost as high retention Excellent retention of coarse and gelatinous
precipitates, creped As No. 113 but supplied prepleated
Similar to No. 113 but thinner and very strong. Smooth surface
As No. 114 but supplied prepleated
F F
F
30 25
25
H H
H
0.42 0.19
0.19 *These schools grade papers are manufacturered and packed to less critical standards than other Whatrman filters. Approximate values only.
0.06 0.06
0.06
S S F
2.5 3
30
L L
H
0.20 0.18 0.42
0.06 0.20 0.06
Flowrate M/F
M/F M/F M/F M/F M
Filtration grade of chromatography paper 3MM Chr M Excellent retention of coarse and gelatinous
F
Retention microns
11 - 25 10 11 8 8 6
11 20 - 25
strength H H L L L
Wet
M M L
Thickness mm
0.15 0.23 0.18 0.19 0.19 0.39 0.34 0.21
Ash %
— —
0.06 0.06 0.06 0.06 —
0.06
Filter Papers, Quantitative Grades Very high quality papers for use in critical gravimetric analysis.
Grade No.
Ashless 40 41 42 43
44
Hardened 50
52 54
General purpose gravimetric paper
For filtration of coarse and gelatinous precipitates Highly retentive for fine precipitates
Intermediate retention and flow rate between Nos. 40 and 41
Thin version of No. 42
For retention of finest crystalline precipitates. Highly glazed surface
General purpose hardened grade For filtration of coarse and gelatinous precipitates
Hardened ashless 540 541 542
Flowrate M – Medium
F – Fast S – Slow
General purpose hardened ashless paper
For filtration of coarse and gelatinous precipitates Highly retentive for fine precipitates
Flowrate
M F S
M/F S
S
M F
M F S
Retention microns
8
20 - 25 2.5 16
3 2.7 7 20 - 25 8
20 - 25 2.7
strength Wet
L L L L
L H
H H
H H H
Thickness mm
0.20 0.21 0.20 0.21
0.17 0.12
0.17 0.18
0.15 0.16 0.15
Wet Strength L – Suitable for gravity or low suction filtration. Care must be taken to prevent rupture of the paper.
M – Will withstand all normal use on Buchner funnels or other devices under suction or moderate pressure. H – High wet strength and high chemical resistance.
