Qualitative Filter Paper Grade 642(=2)

Standard Grades (Non Wet-Strengthened)

Standard qualitative filter papers are suitable for quadrant folded or gravity flow applications.

These grades contain a high level of alpha-cellulose that provides high purity but will weaken

when wet. The inherent strength of standard (untreated) grades does not pose a problem when

they are used in routine quadrant folded applications. We do not recommend these grades for

use in vacuum work or when wet handling is required.