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.
F2041 GRADE – Fast filtration
Fast ashless filter paper in the CHM® 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.
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.
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.
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.
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 and 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)
Ashless hardened filter paper for quantitative analysis
Hardened Ashless Filter papers are acid hardened which reduces the ash content to an extremely low level.
These filters are produced by a complex elaborate washing process under stringently controlled conditions. Firstly, acid washing is arranged. Then a series of washes in demineralised water comes, which increase the strength of the paper, thus making them particularly suitable for Buechner filter funnels and for a wide range of critical analytical filtration operations.
Through this process, a maximum ash content of 0.006% is attained, which means that no contaminants are introduced when filtering and also that full compliance with international standards on this subject is achieved.
F2140 GRADE – Medium filtration
Hardened ashless filter paper with medium retention and flow rate
Extremely strong and pure. With a hard surface, it is recommended for filtering medium-sized precipitates such as most metal sulphides.
High chemical resistance. Used in the gravimetric analysis of metals in acid and slightly alkalinized solutions, pressure filtration.
F2141 GRADE - Fast filtration
Hardened ashless filter paper with fast flow rate. Preferably used in filtration of coarse flocculent and bulky precipitates (as aluminium, chromium or hydroxides of iron, bismuth, cobalt, sulphides of copper, various organic metal precipitates, etc.) and gelatinous precipitates in acid/alkaline solutions during gravimetric analysis.
F2142 GRADE - Slow filtration
Hardened ashless filter paper with high retention and slow flow rate.
High chemical resistance. Often used for filtering very fine precipitates and in gravimetric metal determinations.
Hardened low ash filter paper for quantitative analysis
These filters, made from cotton linters fiber, are put through a washing process and treated with strong acids. Then they are washed in demineralised water to produce high wet strength (makes them appropriate for filtering in low pressure or vacuum conditions) and chemical resistance (makes them suitable to work with acids or alkaline solutions in moderate concentrations). A very low ash-content filter with a 0.015% (the maximum ash contents of these filters is intermediate between CHM® qualitative grades and ashless quantitative grades).
A very smooth surface makes easy to recover the whole of the precipitate after the filtration which is particularly indicated for Buchner filtrations.
F2050 GRADE – Slow filtration
CHM filter with slow filtering rate, with excellent retention of very fine particles, such as barium sulphate, zinc sulphide, etc. Hardened and glazed surface makes this paper suitable for use in the electronic industry in carriers of electronic components or boards.
F2052 GRADE - Medium-fast filtration
General purpose hardened filter paper with medium-rate filtering, with good retention of medium particles, such as calcium oxalate and metal sulphides.
Suitable for various tests on the intake of atmospheric pollution (sulphur oxides, ammonia gases, etc) as well as for microbiological water analysis.
They are used in fat extraction equipment as well in the oilseed and food industries, and in a large number of routine analytic procedures.
F2054 GRADE - Fast filtration
The fastest filter paper in the range.
Suitable for filtering coarse, gelatinous or dense liquids. Good load capacity.
| GRADE | PROPERTIES | WEIGTH, g/m2 | THICKNESS, µm | RETENTION RANGE, µm | ASH CONTENT, % |
| F2040 | Medium-slow | 85 | 170 | 7-9 | <0.007 |
| F2041 | Fast | 85 | 190 | 20-25 | <0.007 |
| F2042 | Very slow | 100 | 160 | 2-3 | <0.007 |
| F2043 | Medium | 85 | 180 | 14-17 | <0.007 |
| F2044 | Slow | 85 | 160 | 2-4 | <0.007 |
| F2045 | Very fast | 85 | 210 | 25-30 | <0.007 |
| F2140 | Medium | 84 | 160 | 7-12 | <0.006 |
| F2141 | Fast | 84 | 170 | 20-25 | <0.006 |
| F2142 | Slow | 95 | 150 | 2-4 | <0.006 |
| F2050 | Slow | 90 | 180 | 2-3 | <0.015 |
| F2052 | Medium-Fast | 90 | 190 | 7-8 | <0.015 |
| F2054 | Fast | 90 | 200 | 20 | <0.015 |
| Order information |
| DIAMETER (mm) | F2040 | F2041 | F2042 | F2043 | F2044 | F2045 |
| CIRCLES (1000/box) |
| 12.7 | F2040-012 | F2041-012 | F2042-012 | F2043-012 | F2044-012 | F2045-012 |
| 25 | F2040-025 | F2041-025 | F2042-025 | F2043-025 | F2044-025 | F2045-025 |
| CIRCLES (*) (100/box) |
| 40.5 | F2040-040 | F2041-040 | F2042-040 | F2043-040 | F2044-040 | F2045-040 |
| 42.5 | F2040-042 | F2041-042 | F2042-042 | F2043-042 | F2044-042 | F2045-042 |
| 47 | F2040-047 | F2041-047 | F2042-047 | F2043-047 | F2044-047 | F2045-047 |
| 50 | F2040-050 | F2041-050 | F2042-050 | F2043-050 | F2044-050 | F2045-050 |
| 55 | F2040-055 | F2041-055 | F2042-055 | F2043-055 | F2044-055 | F2045-055 |
| 70 | F2040-070 | F2041-070 | F2042-070 | F2043-070 | F2044-070 | F2045-070 |
| 80 | F2040-080 | F2041-080 | F2042-080 | F2043-080 | F2044-080 | F2045-080 |
| 90 | F2040-090 | F2041-090 | F2042-090 | F2043-090 | F2044-090 | F2045-090 |
| 100 | F2040-100 | F2041-100 | F2042-100 | F2043-100 | F2044-100 | F2045-100 |
| 110 | F2040-110 | F2041-110 | F2042-110 | F2043-110 | F2044-110 | F2045-110 |
| 125 | F2040-125 | F2041-125 | F2042-125 | F2043-125 | F2044-125 | F2045-125 |
| 150 | F2040-150 | F2041-150 | F2042-150 | F2043-150 | F2044-150 | F2045-150 |
| 185 | F2040-185 | F2041-185 | F2042-185 | F2043-185 | F2044-185 | F2045-185 |
| 200 | F2040-200 | F2041-200 | F2042-200 | F2043-200 | F2044-200 | F2045-200 |
| 240 | F2040-240 | F2041-240 | F2042-240 | F2043-240 | F2044-240 | F2045-240 |
| 270 | F2040-270 | F2041-270 | F2042-270 | F2043-270 | F2044-270 | F2045-270 |
| 320 | F2040-320 | F2041-320 | F2042-320 | F2043-320 | F2044-320 | F2045-320 |
| SIZE (mm) | SHEETS (100/pack) |
| 460x570 | F2040-460570 | F2041-460570 | F2042-460570 | F2043-460570 | F2044-460570 | F2045-460570 |
| 580x580 | F2040-580580 | F2041-580580 | F2042-580580 | F2043-580580 | F2044-580580 | F2045-580580 |
| DIAMETER (mm) | F2140 | F2141 | F2142 | F2050 | F2051 | F2054 |
| CIRCLES (1000/box) |
| 25 | F2140-025 | F2141-025 | F2142-025 | | | |
| CIRCLES (*) (100/box) |
| 42.5 | F2140-042 | F2141-042 | F2142-042 | F2050-042 | F2052-042 | F2054-042 |
| 47 | F2140-047 | F2141-047 | F2142-047 | F2050-047 | F2052-047 | F2054-047 |
| 50 | F2140-050 | F2141-050 | F2142-050 | F2050-050 | F2052-050 | F2054-050 |
| 55 | F2140-055 | F2141-055 | F2142-055 | F2050-055 | F2052-055 | F2054-055 |
| 70 | F2140-070 | F2141-070 | F2142-070 | F2050-070 | F2052-070 | F2054-070 |
| 80 | F2140-080 | F2141-080 | F2142-080 | F2050-080 | F2052-080 | F2054-080 |
| 90 | F2140-090 | F2141-090 | F2142-090 | F2050-090 | F2052-090 | F2054-090 |
| 100 | F2140-100 | F2141-100 | F2142-100 | F2050-100 | F2052-100 | F2054-100 |
| 110 | F2140-110 | F2141-110 | F2142-110 | F2050-110 | F2052-110 | F2054-110 |
| 125 | F2140-125 | F2141-125 | F2142-125 | F2050-125 | F2052-125 | F2054-125 |
| 150 | F2140-150 | F2141-150 | F2142-150 | F2050-150 | F2052-150 | F2054-150 |
| 185 | F2140-185 | F2141-185 | F2142-185 | F2050-185 | F2052-185 | F2054-185 |
| 200 | F2140-200 | F2141-200 | F2142-200 | F2050-200 | F2052-200 | F2054-200 |
| 240 | F2140-240 | F2141-240 | F2142-240 | F2050-240 | F2052-240 | F2054-240 |
| 270 | F2140-270 | F2141-270 | F2142-270 | F2050-270 | F2052-270 | F2054-270 |
| 320 | F2140-320 | F2141-320 | F2142-320 | F2050-320 | F2052-320 | F2054-320 |
| SIZE (mm) | SHEETS (100/pack) |
| 460x570 | | | | F2050-460570 | F2052-460570 | F2054-460570 |
| 580x580 | | | | F2050-580580 | F2052-580580 | F2054-580580 |
| (*) Add an F at the end of the reference for folded circles (e.g. F2040-150F) |
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