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NNN-P-1475 Revision B, June 18, 1976
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PAPER, FILTER, ANALYTICAL
Includes all amendments and changes through Notice 1, January 31, 1996
Additional Comments: CNCL NO S/S
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This specification covers analytical filter papers used in laboratories.

Filter paper shall be of the following types and classes
       Type I  -  Qualitative
         Class 1  -  For coarse and gelatinous precipitates
         Class 2  -  For medium precipitates
         Class 3  -  For fine precipitates

       Type II  - Quantitative
         Class 4  -  For fine precipitates hardened
         Class 5  -  For coarse and gelatinous precipitates
         Class 6  -  For medium precipitates
         Class 7  -  For fine precipitates
         Class 8  -  For fine precipitates, thin.