Detailed Grade Description of HAWACH Qualitative Filter Paper

Brief introduction of HAWACH

HAWACH is a high-tech enterprise with a first-class modern management level mainly engaged in laboratory instruments, laboratory consumables, chemical reagents, biochemical reagents, various standard samples, and a complete set of laboratory furniture designs, and laboratory gas pipelines. We serve a wide range of life sciences, petrochemical, testing, industrial, pharmaceutical, and commercial laboratories, with strategic partnerships with world-renowned scientific instrument manufacturers, as well as continuous optimization of the company’s own operations and service quality. HAWACH specializes in providing basic to specialized laboratory and industrial testing instruments, providing world-class quality testing instruments for laboratories at all levels. You can almost find any lab consumables from HAWACH. Today, we will mainly focus on filter paper. As we know there are qualitative filter paper and qualitative filter papaer available for different experiments. To be more exact, we will discuss the qualitative filter paper in detail, from the filtration speed and normal grade and wet-strengthed grade.

Filtration speed of qualitative filter paper

The main function of qualitative filter paper is filtration. The different filtration speeds can be divided into fast, medium, and slow. For the fast qualitative filter paper with high capacity, it’s suitable for filtration of coarse particles, media, and gelatinous sediments. The medium-speed qualitative filter paper has medium separation performance and medium filtration speed, covering most of the liquid filtration in laboratory applications and is often used in industrial filtration, so it has the highest sales. The slow-speed qualitative filter paper has a strong retention capacity and obvious adsorption effect, which can retain particles to a greater extent and take a long time.

Different grades of qualitative filter paper

The quantitative filter paper has five main grades, BIO-44, BIO-43, BO-42, BIO-41and BIO-40, based on particle retention. Each grade has its suitable usage. For the qualitative filter paper, there are more grades than quantitative filter paper, from the BIO-1 to BIO-6 and two additional special filter paper-wet strengthened grades. The following will introduce it one by one.

BIO 1: 11um
This is often used in conventional filtration and has a medium retention capacity and flow rate. Specifications from 10mm diameter to 500mm round and 460*570mm rectangle. This filter paper can also be used on filter bowls. In the food industry, Grade 1 filter paper is often used to separate solid food from related liquids or extract liquids and is also widely used for simple qualitative analysis separations in teaching. For the detection of air pollutants, there are discs and rolls available, which collect atmospheric dust from the atmosphere and then use a photometer to measure the level of pollution. In gas detection, the filter paper is wetted with a chromogen and quantified by light reflection.

BIO 2: 8μm
For the BIO-2 filter paper, it has slightly stronger retention than Grade 1, but the filtration time is relatively longer (the filtration speed is relatively slow), and stronger than the Grade 1 adsorption type. In addition to ordinary filtration of 8um-sized particles, its additional adsorption properties are also used, such as retaining soil nutrients in plant growth experiments, monitoring special pollutants in the air and soil testing, etc.

BIO 4: 20-25 μm
It has a very fast filtration rate, featuring very good retention of coarse particles and colloidal precipitates such as ferric hydroxide. In the monitoring of air pollution at a high flow rate, if it is not necessary to retain fine particles, it can also be used to measure standard analytical filter paper such as corn syrup, dairy products, and spore activity of disinfectants, and 3-chloro-1,2-propanediol in food.

BIO 5: 2.5μm
Within the qualitative range, particles are retained to the greatest extent possible. It is able to trap fine precipitates encountered in chemical analysis. The flow rate is slow.

BIO 6: 3μm
For the 3μm filter paper, it is often used for boiler water analysis. HAWACH qualitative filter papers are used in qualitative analysis techniques to identify the properties of substances.

In addition to the above five grades, there are wet-strengthed grades: BIO 91 and BIO 113. For Grade 91 and Grade 113, Due to the addition of a small amount of chemically stabilized resin, these filter papers are very tough and have high wet strength. In ordinary applications, no significant impurities will be introduced as a result.

BIO 91: 10um
It has a common wrinkle, and is widely used for sucrose content analysis of sugarcane and routine sample filtration in pharmaceutical laboratories.

BIO 113: 30μm
For the BIO 113 filter paper, it features a very high load capacity, suitable for filtration of large particles or filtration of gelatinous precipitates. The surface is wrinkled and is the thickest among qualitative filter paper. At the same time, it is also available in the form of a filter cup. To sum up, no matter what kind of quantitative filter papers you need, HAWACH will meet your demands.