Filter Paper - Hawach Scientific Co., Ltd

06/02/2023

The Basics and Types of Filter Paper https://www.hawachfilterpaper.com/the-basics-and-types-of-filter-paper/
Generally, the filter paper types are qualitative filter paper and quantitative filter paper. Qualitative filter paper is often used in qualitative analysis. The reason is that the qualitative filter paper produces more cotton fibers if it is filtered. The quantitative one is dealt with the particular process, which makes the paper not react with the common chemicals, in the production. As a result, it produces fewer impurities and is filter paper used in laboratory quantitative analysis. Hawach provides Wet Qualitative Laboratory Filtration Filter Paper Grade: BIO-2, Qualitative Filter Paper Biology Grade: BIO-6, Qualitative 20 Micron Filter Paper Grade: BIO-4, Quantitative Ashless Filter Paper Grade: BIO-41, Quantitative Cellulose Filter Paper Grade: BIO-44, Quantitative Laboratory Filter Paper Grade: BIO-42, and other filter papers for your choice.

04/12/2020

BIO-2 Filter Paper – Low Ignition Tendency Cigarette Test
https://www.hawachfilterpaper.com/hawach-bio-2-filter-paper-low-ignition-tendency-cigarette-test/
In the past few years, many states in the United States and Canada have introduced legislation requiring cigarette manufacturers to sell ci******es with low ignition propensity (RIP) (commonly known as fire-resistant ci******es).

The driving force behind this legislation was that a large number of fatalities were caused by smoking-related fires. For example, in 2001, 840 people in the United States alone died from smoking-related fires (about 25% of the fire deaths in the United States in 2001). Most victims are children and the elderly. The social damage caused by cigarette fires is estimated to be approximately US $ 4 billion per year (US).

BIO-2 Filter Paper - Low Ignition Tendency Cigarette Test In the past few years, many states in the United States and Canada have introduced legislation requiring cigarette manufacturers to sell ci******es with low ignition propensity (RIP) (commonly known as fire-resistant ci******es). The driving....

21/09/2020

Matters Needing Attention On Filter Paper

Matters Needing Attention On Filter Paper The aperture of Qualitative Filter Paper The pore size of the qualitative filter paper is irregular, usually, the pore size of the qualitative filter paper is large and quantitative is small. The filter paper filter speed is different, the aperture is also d...

31/08/2020

How To Choose Filter Paper
https://www.hawachfilterpaper.com/how-to-choose-hawach-filter-paper/
In general, filter paper can be divided into two types, one is qualitative, one is quantitative. Qualitative filter paper generally refers to the generation of cotton fiber on its surface after filtration, which is generally only suitable for qualitative analysis.

While the quantitative filter paper is generally for the non-ash filter paper, in the process of use must go through a special processing program, to a certain extent, it can effectively resist some chemical reactions, so the generated impurities on its surface will be much less, it is generally used in quantitative analysis.

How To Choose Filter Paper In general, filter paper can be divided into two types, one is qualitative, one is quantitative. Qualitative filter paper generally refers to the generation of cotton fiber on its surface after filtration, which is generally only suitable for qualitative analysis. While th...

10/08/2020

To Know Better Filter Paper Classification And Its Specific Usages
https://www.hawachfilterpaper.com/to-know-better-filter-paper-classification-and-its-specific-usages/
Filter Paper is a filter tool commonly used in chemical laboratories, and round filter paper is frequently seen and mostly made of cotton fibers. Therefore, there are countless small holes on the surface for liquid particles to pass through, while large solid particles cannot pass through, which allows separation of liquid and solid materials.

Classification
Filter paper can be qualitative and quantitative. In the application of analytical chemistry, after the inorganic compound is separated by filtration to separate out the precipitate, the residue collected on the filter paper can be used to calculate the loss rate during the experiment. After the qualitative filter paper is filtered, more cotton fibers are generated, so it is only suitable for qualitative analysis. Quantitative filter paper, especially the ash-free filter paper, can resist chemical reactions more effectively after a special treatment procedure, with fewer impurities, which is suitable for quantitative analysis.

In addition to filter papers for general laboratory applications, there are many applications for filter papers in daily life and engineering. Coffee filter paper is one of the widely used filter papers. The filter paper on the outer layer of tea bags provides high softness and high wet strength. Others use air filter paper for testing suspended particles in the air, and fiber filter paper for different industrial applications.

20/07/2020

https://www.hawachfilterpaper.com/how-to-choose-the-hawach-right-filter-papers/
How To Choose The Hawach Right Filter Papers?
Choosing the right filter for your filtration will be a big help to make sure that you can get the desired results for your applications.You can select a suitable filter material and size, after you consider whether you need vacuum or gravity filtration. Since there are so many types and sizes of filter papers available, you should know how to choose the right one.

When you choose the filter material, you need to consider chemical compatibility, pore size and your filtration method upon the different filter types suitable for different methods.In addition to the material and method, you should consider the amount of your filtration and select the filter of right size.

Hawach provides qualitative and quantitative filter papers. The qualitative filter paper is perfect to identify the properties of substances in qualitative analysis. And the quantitative filter paper is for filtration after the filtration. Hawach’s full lines of different filter paper products can always meet your needs of different levels of purity, hardness, flow rate, loading capacity, and chemical resistance.

Knowledge of Technical Index
The technical index of the filter paper can be divided into two aspects, one is the filter characteristic of the filter paper and the other is the physical property. The filter characteristics include air permeability, gas resistance, maximum pore size, and average pore size. Physical properties include quantitative, thickness, stiffness, corrugation depth, durability, resin content, etc.

24/06/2020

The Dragon Boat Festival is the fifth day of the fifth lunar month of each year in China, also known as the Duanyang Festival, Noonday Festival, May Festival, etc.; the Dragon Boat Festival is a traditional festival to commemorate Qu Yuan. Kaoru Atractylodes, Radix Angelicae Dahurica, the custom of drinking realgar wine. "Dragon Boat Festival" is one of China's national legal holidays and is included in the World Intangible Cultural Heritage List.

03/06/2020

Filtration Efficiency And Applicability Of Filter Paper

https://www.hawachfilterpaper.com/filtration-efficiency-and-applicability-of-filter-paper/

In general, there are two types of filter paper in the laboratory: qualitative filter paper and quantitative filter paper. In the application of analytical chemistry, when sediment is separated after the inorganic compound is filtered, the residue which is collected on the filter paper can be used to figure up wastage rate during the process of experiment.

After filtration, many cotton fibers will be created on qualitative filter paper, so it is only suitable for qualitative analysis. As for quantitative filter paper, especially the ashless filter paper which is specially processed, it can effectively resist chemical reaction so that fewer impurities will be produced. Thus, it can be applied in quantitative analysis.
Apart from filter paper which is applied generally in the laboratory, it is also widely used in daily life or in the engineering. It can be used for testing suspended particles in the air or applied in different industrial applications.

When choosing a proper filter paper, four elements have to be considered: hardness, filter efficiency, capacity, and applicability. Because the filter paper will be wet when doing filtration, high hardness must be considered in experimental procedures with a long time of filtration. Furthermore, filter paper with high efficiency means a high filtration rate and high-resolution ratio.

Tips for Selection
Several points should be considered in the selection of filter paper:
1. The use area of the filter paper is large, the dust content is large, the resistance is small, the service life is long, and the cost is correspondingly increased.
2. The smaller the fiber diameter is, the better the interception effect is and the higher filtration efficiency is.
3. The binder content of the binder in the filter material is high, the tensile strength of the paper is high, the filtration efficiency is high, the dust of the filter material is small, the resistance is good, but the resistance is correspondingly increased.

Hardness and Capacity
The selection of appropriate filter paper can be determined by taking into account the following factors. For the hardness factors, filter paper often becomes wetting in the filtering process, so some experimental steps of long-term filtration should consider the use of tough filter paper after wetting. For the capacity factor, the solid particles accumulated during filtration may block the pores on the filter paper, therefore, the denser the seepage pores are, the higher the capacity is and the more filters are allowed.

Filtration Efficiency and Applicability
The density and the size of the water-permeable pores on the filter paper affect its filtration efficiency. The filter paper with high efficiency is high in filtering speed and high in resolution. Applicability: Some filter paper is accomplished by adopted a special manufacturing step, for example, in the test of the nitrogen content in the blood, and the use of a nitrogen-free filter paper and the like. Note that the filter paper cannot filter the zinc chloride, otherwise, the filter paper will be corroded and damaged by the zinc chloride.

21/05/2020

How To Use Filter Paper

https://www.hawachfilterpaper.com/how-to-use-hawach-filter-paper/

Because the cotton fiber in the filter paper has a good affinity with water, it can absorb about 22 percent of the water, in the form of a hydrogen bond with cellulose water has 6 to 7 percent. In general, it is very difficult to remove. Compared with the affinity with water, the affinity between the cotton fiber in filter paper and the organic solvent is weaker.

Therefore, in most cases, the paper chromatography method takes the bound water in the filter paper fiber as the fixed phase, while the mobile phase is dominated by the organic solvent. When the mobile phase of the organic solvent passes through the sample, the water, and the organic phase are continuously distributed. Then, as the mobile phase keeps moving, the substances of various components are continuously redistributed, further separating and purifying the substances. This use of filter paper is commonly found in chemical laboratories.

How to use filter paper
In the experiment, the filter paper is often used together with filter funnel and brinell funnel. Fold the filter paper into a suitable shape before use. The higher the folding degree of the filter paper, the higher the surface area it can provide and the better the filtering effect. Place the glass rod of drainage on the multi-layer filter paper, force evenly to avoid the damage of the filter paper.

Filter paper operation process
1. Fold the filter paper in half, twice in succession, and fold it into a 90° center Angle shape.
2. Place the folded filter paper in three layers on one side and open one layer on the other side to form a funnel.
3. Put the filter paper into the funnel. Pour some water into the mouth of the funnel.
4. Place the filter paper funnel on a filter funnel, such as a ring on an iron stand, and place a beaker or test tube to receive the filtrate at the neck of the funnel, with the tip of the funnel neck resting on the wall of the receiving container.
5. When injected into the funnel need to filter the liquid, right-hand hold drip beaker, left hand holding a glass rod, glass rod bottom on tight funnel three-layer on the low side, make close to the glass rod at the top, to filtrate body along the flow at the top, and then tilt the glass rod, momentum into the funnel, flow to the liquid in the funnel, liquid level should not exceed the height of the filter paper funnel.
6. As the liquid passes through the filter paper and flows down the neck of the funnel, check to see if it is flowing downstream along the sides of the cup to the bottom. Otherwise, you should move the beaker or turn the funnel so that the tip of the funnel is firmly attached to the wall of the cup so that the liquid can flow slowly down the inner wall of the beaker.

How To Use Filter Paper Because the cotton fiber in the filter paper has a good affinity with water, it can absorb about 22 percent of the water, in the form of a hydrogen bond with cellulose water has 6 to 7 percent. In general, it is very difficult to remove. Compared with

28/04/2020

A Brief Analysis Of Filter Paper
https://www.hawachfilterpaper.com/a-brief-analysis-of-filter-paper/
Hawach has both qualitative filter paper and quantitative filter paper: The difference between quantitative filter paper and qualitative filter paper is mainly the impurity content. Qualitative filter paper is used for qualitative chemical analysis and corresponding filtration separation; quantitative filter paper is for quantitative chemical analysis in gravimetric analysis tests and corresponding analytical tests.

Qualitative filter paper
Standard grade and wet strength grade: The reinforced qualitative filter paper is added a small amount of chemical stabilizer to increase the bursting resistance of the filter paper. However, because the stabilizer contains nitrogen, the qualitative filter paper is not recommended for the Kay nitrogen test, which is a method for determining the amount of total nitrogen in a compound or mixture.

Quantitative filter paper
Ashless grade, hardened low ash grade, hardened ashless grade: The essential difference is the impurity content and hardness.
Hardened low ash grade and hardened ashless grade mean the surface acid pickling on the basis of quantitative filter paper to increase the surface bursting strength of filter paper. After use and sample filtration, it is necessary to scrape the retentate for quantitative analysis. The ashless grade has a lower ash content than the low ash grade.

12/03/2020

Which Kind Of Filter Paper Is Suitable For You?
https://www.hawachfilterpaper.com/which-kind-of-filter-paper-is-suitable-for-you/
Qualitative filter paper refers to “qualitative analysis filter paper”, which is compared with quantitative analysis filter paper and chromatography qualitative analysis filter paper. The paper is loose and has a strong absorption of liquid.