CHMLAB GROUP, S.L.

Quantitative Ashless Filter Paper

These CHM® filter papers are used for quantitative analysis and designed for preparation of samples and gravimetric analysis. They are made of refined pulp and linters with virtually 100% of alpha-cellulose content. These filter papers are guaranteed free of possible residual acids used in some production methods. Extremely low percentage of ash content (maximum ash content of 0.007%). Ashless filter papers for quantitative analyses are suitable for Buechner funnels and for filtration under pressure.

F2040 GRADE – Medium-slow filtration

The classic general purpose ashless filter paper with a medium-to-slow filtering rate.

Suitable for typical applications include gravimetric analysis for numerous components and for all kind of pre-filtrations.

Used as a primary filter for separating solid matter from aqueous extracts, in tests for fat and oil in water, in general soil analysis, quantitative determination of sediments in milk, as well as in analytical grade clean-up filter for solutions prior to AA spectro-photometry.

Suitable for finer precipitates such as hot barium sulphate.
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F2041 GRADE – Fast filtration

Fast ashless filter paper in the CMH® quantitative range together with F2045.

It is particularly suitable for analytical procedures and tests involving large particles or gelatinous precipitates (e.g. metal hydroxides and sulphides).

It is also used in metal (Pb) tests in water testing analysis, quantitative air pollution analysis, food industry, paper industry, etc.

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F2042 GRADE – Very slow filtration

An ashless world standard filter for critical gravimetric analysis.
With slow filtering rate and fine particle retention.
Typical analytical precipitates such as cold barium sulphate, lead sulphate, zinc and nickel sulphides, etc.

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F2043 GRADE - Medium filtration

Ashless filter with medium filtration speed and good retention (between Grade F2040 and Grade F2041) of medium and thick particles.

Suitable for gravimetric measurements of gypsum/lime suspensions in power plants.

F2043 Grade is particularly applied in metallurgical industry laboratories for metal tests. Typical applications include foodstuffs analysis, soil analysis, particle collection in air pollution monitoring, COD and TOC determination, inorganic analysis in the construction, mining and steel industries, for Blaine test in the cement industry (standards UNE 80-112-91 and EN 196-6), and for carrying out other chemical analysis on cement.

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F2044 GRADE – Slow filtration

Thinner version of No. F2042 but with higher flow rate (twice as fast as No. F2042).

Very fine particles but with lower ash weight per sample.

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F2045 GRADE – Very fast filtration

Filter paper of very high rate of filtration, wide-pored, soft, spongy structure, extremely low-ash content.

Food industry applications: determination of ash contents in foodstuffs, PCB determination in foodstuffs.

Beverage industry applications: processing (ashing) fruit juice samples for photometric determinations (e.g. phosphate).

Environmental analysis: Determination of filterable substances and the residue on ignition (dry weight) for the examination of water, waste water and sludge (DIN 38 409 part 2)

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