Filtration sheets are made of the same substance as the Pragopol microporous membrane ultrafilters being created by the gelatination process of the colloid solutions of nitrocellulose but applied onto the textile substrate. The structure of the tiniest voids within the filtration substance which causes its high porosity and retention capability remains the same but the mechanical strength being substantially enhanced. Like the Pragopor membrane ultrafilters, the filtration sheets feature a good resistance against most acids and alkalis and some solvents. As for the other features, both types of filters are fairly the same.
The filtration substance may be used in many fields but, unlike the membrane ultrafilters, are rather preferred in filtration and separation processes of solid particles from liquids and gases and, to a lesser extent, for some methods of chemical analysis.
The filtration sheets are available in five sorts according to the specified pore size:
|Designation of the filters||Size of the pores µm||Examples of use|
|PUFS||6,5 - 8,5||Separation of aerosol particles from gases|
|RUFS||4,0 - 6,5||Separation of solid particles and fine water droplets from aircraft gasoline|
|AUFS||2,5 - 4,0||Filtration of water, oils and some solutions in chemical industry|
|HUFS||1,0 - 2,5|
|VUFS||0,3 - 1,0||In healthcare filtration facilities|