The Specification of Filter Paper

Currently, there are three kinds of quantitative filter papers in the domestic market. They are fast speed, intermediate speed, and low speed, with category labels of white belt, blue belt, and red belt respectively on the filter paper boxes.

The shapes of quantitative analysis filter paper are round and square. The round filter paper specifications are classified by diameter with 9cm, 11cm, 12.5cm, 15cm, and 18cm. As for the specification of square papers, there are 60cm x 60cm and 30cm x 30cm.

hawach-filter-papers-bio-41 quantitative-filter-papers-bio-41 lab grade filter paper

Filter paper New Size-Diameter of 750mm

Hawach Scientific Filter paper is made of cotton wool with an ash content of less than 0.006%. High alpha cellulose production under strictly controlled production conditions, to ensure batch quality year after year. After more than 15 years of production and promotion, our products get very good feedback from the market, we will keep up going and let more and more clients use them.

In the past years, we used to provide the regular size such as 110mm, 125mm, 150mm, and 180mm, but different applications have some special use for production after the final testing, such as Qualitative filter paper when in the lab you can using 150mm filter paper, but in the real production, maybe you should be using 400mm, 500mm or 750mm.

Recently we customized 750mm filter paper for our VIP Client, the big size saved his time and working efficiency. If you also need 750mm qualitative filter paper or a size less than 750mm, please don’t hesitate to contact us, we will do our best to support your work!

Normally, the residual ash remains a lot in the qualitative filter paper. Filter paper disc is only for ordinary qualitative analysis, sediment filtration, and solution for suspension. It cannot be used for quality analysis. When referring to specification, the qualitative filter paper is almost the same as the quantitative filter paper. However, instead of belts with different colors, the words fast speed, intermediate speed, and low speed are printed on the filter paper boxes.

Furthermore, the quantitative filter paper is mainly used for analysis experiment which needs ashing weighing after filtration. The ash weight is a constant value after each filter paper is assigned. While qualitative filter paper is primarily used for ordinary filtration. So, the difference between the two kinds of filter papers mainly focuses on the ash weight after ashing.

Click here to know more about The Composition and Application Of Filter Paper and Precautions When Using Qualitative and Quantitative Filter Paper.