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Whatman manufactures glass microfiber filters which are used as prefilters for membranes. The excellent properties of the borosilicate glass microfibers enable Whatman to manufacture filters with high loading capacity and retention of very fine particulates.

The Whatman Multigrade GMF 150, used as a prefilter, nearly doubles the volume of sample filtered compared to a single density prefilter. Compared to an unprotected membrane, the volume of sample filtered is three to seven times greater. Conventional prefilters cannot perform in the same way as the Multigrade GMF 150 simply because prefilters of a uniform density do not have the loading capacity of the multiporosity filter technology advanced by Whatman. For highly particulate loaded samples, the performance of GMF 150 filters is recomended.

Glass Microfiber Prefilters

Catalog Number

Description

Multigrade 150
1 μm Particle Retention Rating

1841-047

Multigrade GMF 150 Circles, 1 µm, 47 mm, 40/pk

1841-090

Multigrade GMF 150 Circles, 1 µm, 90 mm, 20/pk

2 μm Particle Retention Rating

1842-047

Multigrade GMF 150 Circles, 2 µm, 47 mm, 40/pk

1842-090

Multigrade GMF 150 Circles, 2 µm, 90 mm, 20/pk

Grade GF/B

1821-025

GF/B Glass Circles, 25 mm, 100/pk

1821-037

GF/B Glass Circles, 37 mm, 100/pk

1821-042

GF/B Glass Circles, 42.5 mm, 100/pk

1821-047

GF/B Glass Circles, 47 mm, 100/pk

1821-090

GF/B Glass Circles, 90 mm, 25/pk

1821-125

GF/B Glass Circles, 125 mm, 25/pk

Grade GF/D

1823-010

GF/D Glass Circles, 10 mm, 100/pk

1823-025

GF/D Glass Circles, 25 mm, 100/pk

1823-035

GF/D Glass Circles, 35 mm, 100/pk

1823-042

GF/D Glass Circles, 42.5 mm, 100/pk

1823-047

GF/D Glass Circles, 47 mm, 100/pk

1823-090

GF/D Glass Circles, 90 mm, 25/pk

1823-125

GF/D Glass Circles, 125 mm, 25/pk

1823-142

GF/D Glass Circles, 142 mm, 25/pk

1823-257

GF/D Glass Circles, 257 mm, 25/pk