QUALITATIVE FILTER PAPERS

A widely used standard grade filter paper for routine applications with medium retention and flow rate.

Slightly more retentive than Grade 1 with a corresponding increase in filtration time (i.e., slightly slower filtration speed).

A standard grade filter used in qualitative analytical techniques to determine and identify materials. For use in büchner funnels.

Fast flow & retention of coarse precipitates

The flow rate of NS 6 is faster than NS 5 with similar particle retention. NS 6 is used in the filtration of fine precipitates and recommended for boiler water analysis and gas filtration.

Grade 6 ...

NS 5 is a slow grade qualitative filter paper which is designed to retain fine particles encountered in qualitative analysis. NS 5 is widely used in Büchner funnels and to clarify cloudy suspensions....

NS 4 is widely used for the filtration of gelatinous precipitates and coarse particles such as magnesium hydroxide， aluminum hydroxide and ferric hydroxide. As a fast filter, this grade is also fou...

NS 3 has excellent loading capacity because it is twice as thick as NS 1. The extra thickness gives higher wet strength and superior absorbency. It is suitable for use as a sample carrier. NS 3 is als...

NS 2 has slightly lower filtration speed than NS 1 with finer particle retention and higher absorption. This grade is used to retain particles above 8 µm in size in routine laboratory applications. I...

NS 1 is the most widely used filter paper for general applications. It has medium flow rate and medium particle retention. It is often used in qualitative analytical separations for precipitates such ...