FILTRATION
Good filtration depends on two elements, the retention of the filter paper
and the speed of the filter paper. Fast papers will retain only coarse
particles, slower papers retain fine particles. The optimum choice is a paper
which is as fast as possible, yet retains all visible particles giving a clear
filtrate. Wet strength of filter papers is adequate for most use, however,
certain conditions will weaken a paper such as suction, heavy precipitates or
chemical attack. Therefore for any of these conditions, use a paper with high
wet strength.
FILTER PAPERS
| No. | Surface | Ash | Retention in Microns | Wet Strength & Chemical Resistance Strength | Types of Filtration |
| 1 | Smooth | Maximum | 11 | Low-Wet | Gravity |
| 2 | Smooth | Maximum | 8 | Low-Wet | Gravity |
| 3 | Rough | Maximum | 6 | High-Wet | Suction |
| 4 | Smooth | Maximum | 20-25 | Low-Wet | Gravity |
| 42 | Rough | Minimum | 2.5 | Low-Wet | Gravity |
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WHATMAN #1 |
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| box of 100 | Order | ||
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F391 |
5.5 cm |
$6.30 |
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F392 |
7.0 cm |
$8.30 |
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F393 |
9.0 cm |
$10.40 |
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F394 |
11.0 cm |
$12.60 |
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F395 |
12.5 cm |
$13.50 |
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F396 |
15 cm |
$19.60 |
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F397 |
18.5 cm |
$28.15 |
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F398 |
24.0 cm |
$39.50 |
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our $25.00 minimum for ordering
| WHATMAN #2 Qualitative. Medium filtering speed. |
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| Box of 100 | Order | ||
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F405 |
4.25 cm |
$6.50 |
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F406 |
5.5 cm |
$6.75 |
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F407 |
7.0 cm |
$9.25 |
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F408 |
9.0 cm |
$10.40 |
[Add to Cart] |
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F409 |
11.0 cm |
$13.90 |
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F410 |
12.5 cm |
$17.50 |
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F411 |
15.0 cm |
$23.80 |
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F412 |
18.5 cm |
$34.50 |
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F413 |
24.0 cm |
$49.75 |
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Please remember
our $25.00 minimum for ordering
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WHATMAN #3 |
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| Box of 100 | Order | ||
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F447 |
5.5 cm |
$10.35 |
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F448 |
7.0 cm |
$12.75 |
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F449 |
9 cm |
$18.25 |
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F450 |
11.0 cm |
$22.55 |
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F451 |
12.5 cm |
$27.15 |
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F452 |
15.0 cm |
$40.00 |
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F453 |
18.5 cm |
$52.65 |
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F454 |
24.0 cm |
$90.55 |
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our $25.00 minimum for ordering
WHATMAN #4 |
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| Box of 100 | Order | ||
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F420 |
5.5 cm |
$8.25 |
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F421 |
7.0 cm |
$9.80 |
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F422 |
9.0 cm |
$12.20 |
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F423 |
11.0 cm |
$15.25 |
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F424 |
12.5 cm |
$20.30 |
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F425 |
15 cm |
$25.60 |
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F426 |
18.5 cm |
$38.65 |
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F427 |
24.0 cm |
$58.30 |
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our $25.00 minimum for ordering
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WHATMAN #42 |
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| Box of 100 | Order | ||
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F431 |
5.5 cm |
$22.55 |
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F432 |
7.0 cm |
$27.50 |
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F433 |
9.0 cm |
$36.70 |
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F434 |
11.0 cm |
$44.65 |
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F435 |
12.5 cm |
$51.50 |
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F436 |
15.0 cm |
$64.50 |
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F437 |
18.5 cm |
$97.30 |
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our $25.00 minimum for ordering
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S&S SHARK SKIN |
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| Box of 100 | Order | ||
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F439 |
24 cm |
$26.25 |
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F440 |
50 cm |
$58.50 |
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our $25.00 minimum for ordering
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WHATMAN STUDENT
GRADE |
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F445 |
$4.75 |
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