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147
FILTER PAPERS
390
-
green
spot
- slowly filtering, narrow pores, ashless hardened
Filtration of fine precipitates such as lead dioxide, calcium fluoride nickel
sulphide, zinc sulphide
Basis weight:
84 g/m
2
Filtration velocity:
10 ml / 100 seconds
Typical pore size:
3 - 5 µm
Similar to:
Whatman 40, S&S 589/6, M-N 640d
Diam.
Code
Grade/Description
Pack of
55 mm FTR 3.103.055 390 / Filter discs. Green dot
100
70 mm FTR 3.103.070 390 / Filter discs. Green dot
100
90 mm FTR 3.103.090 390 / Filter discs. Green dot
100
110 mm FTR 3.103.110 390 / Filter discs. Green dot
100
125 mm FTR 3.103.125 390 / Filter discs. Green dot
100
150 mm FTR 3.103.150 390 / Filter discs. Green dot
100
185 mm FTR 3.103.185 390 / Filter discs. Green dot
100
240 mm FTR 3.103.240 390 / Filter discs. Green dot
100
391
-
blue
spot
- very slowly filtering, fine pores, ashless hardened
Fine-grained precipitates such as barium sulphate, metannic acid,
cupros oxide
Basis weight:
84 g/m
2
Filtration velocity:
10 ml / 180 seconds
Typical pore size:
2 - 3 µm
Similar to:
Whatman 44, S&S 589/3, M-N 640de
Diam.
Code
Grade/Description
Pack of
55 mm FTR 3.104.055 391 / Filter discs. Blue dot
100
70 mm FTR 3.104.070 391 / Filter discs. Blue dot
100
90 mm FTR 3.104.090 391 / Filter discs. Blue dot
100
110 mm FTR 3.104.110 391 / Filter discs. Blue dot
100
125 mm FTR 3.104.125 391 / Filter discs. Blue dot
100
150 mm FTR 3.104.150 391 / Filter discs. Blue dot
100
185 mm FTR 3.104.185 391 / Filter discs. Blue dot
100
240 mm FTR 3.104.240 391 / Filter discs. Blue dot
100
393
-
purple
spot
- particularly slow filtering, especially fine pores, ashless
hardened
For extremely difficult filtration conditions and particularly fine
precipitates
Basis weight:
100 g/m
2
Filtration velocity:
10 ml / 250 seconds
Typical pore size:
1 - 2 µm
Similar to:
Whatman 42
Diam.
Code
Grade/Description
Pack of
55 mm FTR 3.127.055 393 / Filter discs. Purple dot
100
70 mm FTR 3.127.070 393 / Filter discs. Purple dot
100
90 mm FTR 3.127.090 393 / Filter discs. Purple dot
100
110 mm FTR 3.127.110 393 / Filter discs. Purple dot
100
125 mm FTR 3.127.125 393 / Filter discs. Purple dot
100
150 mm FTR 3.127.150 393 / Filter discs. Purple dot
100
185 mm FTR 3.127.185 393 / Filter discs. Purple dot
100
240 mm FTR 3.127.240 393 / Filter discs. Purple dot
100
LABORATORY FILTER PAPERS