High-purity, Qualitative Filter Papers

These paper grades are used for analytical purposes that require a low ash content.

Grades 292 and 292a are especially suitable for soil analyses because they are low in nitrogen. For phosphate or sodium determination, we recommend grades 131 and 132.

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High-purity, Qualitative Filter Papers

Grade

Material

Weight
(g/m2)

Thickness
(mm)

Wet Bursting
Strength (kPa)

Ash content (%)

Particle
retention (µm)

Properties

131

Refined pulp and Linters

80

0.16

20         

<0.02

3 - 5

Narrow pored, slow rate of filtration

132

Refined pulp and Linters

80

0.17

20

<0.02

5 - 8

Medium pored, medium-slow rate of filtration

292

Cotton Linters

87

0.18

5

<0.06

5 - 8

Medium pored, medium-slow rate of filtration

292a

Cotton Linters

97

0.19

5

<0.06

4 - 7

Medium to narrow pored, medium-slow rate of filtration