These filter papers are used for qualitative analysis.
Qualitative filters are made of refined pulp and pure
cotton linters with an alpha-cellulose content of nearly
100%, which gives them a number of diverse filtration properties.
The ash content of less than 0,06% is not reduced by post-treatment.
F1001 GRADE – Medium filtration The most widely used filter paper in the CHM range. Medium retention and flow rate. This grade covers a wide range of laboratory applications
and is frequently used for clarifying liquids. Traditionally this grade is used in qualitative analytical
separations for routine laboratory work as well as rapid
filtration of fine precipitates such as lead sulphate, calcium
oxalate (hot) and calcium carbonate. In agriculture, it is used for soil analysis and seed
testing procedures. In air pollution monitoring, using circles or rolls, atmospheric
dust is collected from airflow and the stain-intensity measured
photometrically. For gas detection, the paper is impregnated with a chromogenic
reagent and colour formation quantified by optical reflectance.
F1002 GRADE – Medium slow filtration Slightly more retentive and absorbent than No. F1001 and
therefore with a moderate to slow filtration speed. In addition to general filtration this grade F1002 is
used for monitoring specific contaminants in the atmosphere,
filtration of fine precipitates, soil testing, it is often
used as folded filter in an analytical funnel. F1003 GRADE – Medium slow filtration
(Thick) Medium to low rate of filtration with double the thickness
comparing with CHM Grade Fine particle retention and excellent loading capacity.
Preferably used for liquids hard to clarify, essences,
oils, tinctures, particularly useful for use in Buechner-funnels. F1004 GRADE – Very fast filtration Very high rate of filtration with excellent retention
of coarse precipitates such as metal hydroxides and sulphides
or gelatinous substances. Preferably used as rapid filter for various organic metal
precipitates, routine cleanup of biological fluids, food
industry analysis, air pollution monitoring (high rates
and the fine particles collection is not critical). F1005 GRADE – Very slow filtration Lowest rate of filtration in the CHM qualitative range
and maximum degree of fine particle Filtration or retention.
Preferably used as clarifying filter for cloudy suspensions
and for water and soil analysis. Particularly used in difficult
filtration conditions and extra fine-grained precipitates,
barium sulphate, cuprous oxide, often specified for clarification
of wine. F1006 GRADE – Slow filtration Similar particle retention as Grade F1005 with higher filtration speed.
Often used for boiler water analysis.
Qualitative filter papers are available as sheets, discs
and folded filters.
In the food industry, Grade F1001 is used for numerous routine
techniques to separate solid foodstuffs from associated
liquid or extracting liquid and it is widely used in education
for teaching simple qualitative analytical separations.
F1001.
The extra thickness gives increased wet strength and allows
a higher solute loading.
