Filter paper aperture and size

Filter paper is a kind of paper with good filtration performance. The paper is loose and has strong absorption properties to liquid. The filter paper commonly used in the analytical laboratory is used as a filter medium to separate the solution from the solid. Filter paper mainly includes quantitative analysis filter paper, qualitative analysis filter paper and chromatographic qualitative analysis filter paper.

Quantitative analysis of filter paper, divided into fast, medium and slow speed categories, on the filter paper box with leucorrhea (fast), blue belt (medium speed), red belt (slow speed) for the classification. The shape of the filter paper is round and square. The specifications of the circular paper are 5.5cm, 7cm, 9cm, 11cm, 12.5cm, 15cm and 18cm, 18.5cm, 24cm, 27cm. The square quantitative filter paper has 60 cm x 60 cm and 30 cm x 30 cm.

The type and specification of the qualitative analysis filter paper are basically the same as the quantitative analysis filter paper, indicating fast, medium speed and slow speed, but printed with fast, medium speed and slow speed.

The chromatographic qualitative analysis filter paper has a filtration speed of 35 seconds or less and less than or equal to 70 seconds and less than or equal to 140 seconds.

Filter paper aperture:
Fast: 80 to 120 microns aperture
Medium speed: 30 to 50 microns pore size
Slow speed: hole diameter is 1 to 3 microns