Quantitative filter paper

The filter paper for quantitative analysis FILTER-LAB® are manufactured using cellulose fibers and cotton linter high purity, which contain alpha-cellulose is practically 100%. These filter papers require a special production process.

Once manufactured the filter paper in the desired physical conditions (weight, thickness, filtration rate, etc.) began a process of washing with acids (usually HF and HCl) 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%

Ref	Filtration	Weight gr/m2	Thikness mm	Pore μm	Ash %
1235	Very quick	80	0.210	25 - 30	< 0.01
1238	Quick	80	0.180	20 - 25	< 0.01
1240	Medium	80	0.170	14 - 18	< 0.01
1242	Medium Slow	80	0.170	7 - 9	< 0.01
1244	Slow	80	0.160	2 - 4	< 0.01
1246	Very Slow	100	0.200	1 - 3	< 0.01

HARDENED

Ref	Filtration	Weight gr/m2	Thickness mm	Pore μm	Ash %
2235	Very quick	80	0.210	25 - 30	< 0.01
2240	Medium	80	0.170	15 - 17	< 0.01
2244	Slow	80	0.160	2 - 4	< 0.01