Filter Paper for Quantitative and Qualitative Analysis

Hawach Filter paper is a kind of paper that has excellent filtration properties. It does well in water intake. In experiments, people often use filter paper as a medium to separate the solid and the liquid.

Qualitative filter paper and quantitative filter paper are frequent in labs. The qualitative filter paper is often used to filter the solution which is applicable to those experiments without any numerical calculation. However, the quantitative filter paper is usually for those needing precision calculations like determining residues.

The filtration products are widely used in the field of solvent filtering, cellulose analysis, and lots of industrial applications as well. Knowing as an essential tool for the labs and industrial process which involves separation and purification, filter paper plays an important role in the processes of separating and purifying in different stages of chromatography.

Besides being a purification product, filter paper usually comes out with muti-functions. Different types of filter papers can offer different filtration levels and capacities. You can find that they are also made for specific samples in particular applications. The application of the filtration product in the right industrial and research needs can be highly beneficial to the overall process.

laboratory filter paper filter paper for laboratory use quantitative-filter-papers-bio-40

Filter Paper for Quantitative Analysis

Hawach Scientific is available high-grade filter papers which are indispensable for routine work in industrial applications and laboratories. Hawach offers a full range of 100+ individual grades of filter and technical papers all manufactured to your exacting standards and engineered to solve all filtration challenges.

The pulp used for making quantitative filter paper is treated with hydrofluoric acid and hydrochloric acid and washed with distilled water in the manufacturing process. Those treatments remove the impurity from the paper fiber.

The quantitative filter paper is suitable for the precise quantitative analysis because the ash when burning is little, which has little effect on the analysis results. And it is usually divided into three types: the fast one, the medium-speed one, and the slow one. There are two designs of quantitative filter paper. One is round and the other is square.

Quantitative filter papers are provided with complete sizes such as grade BIO-40 vacuum filter paper, BIO-41, BIO-42, BIO-43, and cellulose filter papers BIO 44. All of them are manufactured to meet ISO 9001 and ISO 14001 environmental management standards.

Moreover, Hawach is committed to offering ashless filter paper with a variety of thicknesses, with flow rates and characteristics from wide pore and fast to narrow pore, as well as slow rates.

Filter Paper for Qualitative Analysis

Qualitative filter papers provided by Hawach are made of 100% cotton linters, multiple diameters, thickness, filtration rates, and different grades such as BIO-1 filter paper disc, BIO-2, BIO-4, BIO-6, BIO-91, and BIO-113 can greatly satisfy nearly every need. Furthermore, it can be applied to general absorption and blotting, chromatography, or even protection of the surface. Proven product consistency and customized design are fit for your exact requirements.

The qualitative filter paper is different from the quantitative filter paper. There will be more residues after burning it. That is the reason why people hardly use it in the quality analysis experiment. And it is used to filter the solutions mostly.

The Notice of Using Filter Paper

According to the size of the pore, the filter paper can be divided into fast-speed, medium-speed, and low-speed types. In terms of the size of the diameter, there are types of 7 cm, 9 cm, and 11 cm. When we choose which type of filter paper to use in the laboratory, we should consider the quality of the precipitate.

Specifically, the low-speed filter paper is suitable for filtration of the fine-crystal precipitate; the medium-speed is for coarse-crystal precipitate, and the fast-speed is for gelatinous precipitate. When referring to the size of the filter paper, it should be based on the quantity of precipitate. Normally, the height of the precipitate is not allowed to surpass 1/3 of the height of the filter paper cone.

Moreover, the size of the filter paper should match the size of the funnel. In general, the upper edge of the filter paper should be 1 cm lower than the upper edge of the funnel. Speaking of the funnel, it should be with a long neck of 15 cm to 20 cm, and the angle of the funnel cone should be 60°. Furthermore, in order to keep the liquid column in the neck, the diameter of the long neck should be 3 mm to 5 mm.

To know more about filter paper, please see The Specification Of Filter Paper.