Filter paper for quantitative analysis FILTER-LAB® are made under the strictest requirements of quality not only of the raw materials used but also of the conditions in which the production processes take place. For its manufacture we use cellulose fibers and very pure cotton linters whose content in alpha cellulose is virtually 100%. At any rate, the cellulose fibers its natural state contain small quantities of organic and inorganic impurities. It is because of this that these paper
filter papers require a special production process.

Once the filter paper is manufactured in the desired physical conditions (weight in grams, thickness, speed filtration, etc.) a washing process with acids is initiated (generally HF and
HCI) which concludes with a final cleaning with demineralized water. This will achieve two important characteristics:

* High resistance to wet state.
* Ash content less than 0.01%

Because of all this, these filters are specially suitable for filtration with Büchner funnels in
quantitative analyses since they meet the requirements of international standards with
regard to ash content.

APPLICATIONS

PN1240 Medium filtration

• Filtration of medium-sized particles: calcium oxalate, some metallic sulfates and others
• Analyses of the dimension of the grain of cement by Blaine’s test and Dickerhoof system.
• Calculation of Mg in waters or as quality standard in gravimeters.
• Determination of the content of some kind of cements.
• Analyses of food