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Quantitative Filters - 391 - blue spot

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391 - blue spot - very slowly filtering, fine pores, ashless hardened

quantitative ashless filter papers are recommended for quantitative analysis.
As quantitative analysis requires a high purity, these filters are being washed out with acid.

Fine-grained precipitates such as

barium sulphate
metannic acid
cupros oxide

Basis Weight:	84 g/m2
Filtration velocity:	10 ml / 180 seconds
Typical Pore Size:	2 - 3 µm
Similar to:	Whatmann 44, S&S 589/3, M-N 640de

Diam.	Code	Grade/Description	Pack of
55 mm	FTR 3.104.055	391 / Filter discs. Green dot	100
70 mm	FTR 3.104.070	391 / Filter discs. Green dot	100
90 mm	FTR 3.104.090	391 / Filter discs. Green dot	100
110 mm	FTR 3.104.110	391 / Filter discs. Green dot	100
125 mm	FTR 3.104.125	391 / Filter discs. Green dot	100
150 mm	FTR 3.104.150	391 / Filter discs. Green dot	100
185 mm	FTR 3.104.185	391 / Filter discs. Green dot	100
240 mm	FTR 3.104.240	391 / Filter discs. Green dot	100

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