A Class of One.

Whatman. Glass microf ibre f i l ters. Retention 0.7 /i.m to 2.7 μ,ιη; high speed; high loading capacity The purity of borosil icate glass. Noth ing else. Consistent uni formi ty. Grades for every appl icat ion. Circles and sheets.

From laboratory supply dealers wor ldwide .

For comprehensive technical l iterature, please wri te: Whatman Laboratory Products Inc. Whatman Paper Division Π 9 Bridewell Place, Cl i f ton, New Jersey 07014, Tel: (201)773-5800.

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