What is lab filtration paper?

Laboratories require specialized, high-quality filtration methods for a variety of scientific research and experimentation processes. Purity, reliability, and validity of filter materials are essential for accurate measurements and data collection.

Filtration is a physical mechanical process for separating solids from fluids by interposing a porous medium though the fluids can pass but physical particles cannot. Both the surface and the matrix of the filter medium retain particles from the fluid. Laboratory filter paper is considered a depth filter: filter fibers are arranged randomly, so it is not possible to determine a fixed porosity for a specific filter paper grade. Nominal retention is used instead for classification.

Quality filtering papers remove impurities and particles from liquid fluids as well as retain impure substances within the matrix of filtration material. As particles are trapped by the filter, the filtration properties of the material become altered. Random positioning of fibers within the filter paper creates a secondary layer of filtration – which is why it is not possible to establish the nominal porosity of filter papers. Filtration papers can be described as depth filters because the material has a capacity to filter and retain particles when processing large sample quantities.

Filter paper is available in several optional varieties for a broad range of laboratory applications. There are two fundamental types of filter paper: quantitative and qualitative.

Why is Ahlstrom-Munksjö considered the highest quality laboratory filter paper?

Ahlstrom-Munksjö is the highest quality laboratory filter paper because it is made from high-quality materials, is precision-manufactured, and is rigorously tested to ensure that it meets the highest standards of performance.

Ahlstrom-Munksjö's filter papers are made from a variety of materials, including cellulose, glass fiber, and nylon. These materials are carefully selected for their strength, durability, and chemical resistance. The papers are then precision-manufactured to ensure that they have the correct pore size and thickness for the specific application.

Ahlstrom-Munksjö's filter papers are rigorously tested to ensure that they meet the highest standards of performance. They are tested for strength, durability, chemical resistance, and filtration efficiency. The company also offers a variety of filter papers that are designed for specific applications, such as filtration of hazardous chemicals and filtration of biological samples.

Ahlstrom-Munksjö's filter papers are the best choice for laboratories that require high-quality, reliable filter papers. The company's products are used by a wide range of industries, including pharmaceutical, chemical, and environmental.

What is the difference between quantitative filter paper and qualitative filter paper? 

Qualitative filter paper

Qualitative filter papers are used when substance separation is necessary to identify material content. Qualitative filter paper offers a range of retention and flow options for a wide variety of laboratory processes. Nominal retention ranges from 2 to 20 micrometers, and thicknesses between 150 and 320 micrometers are available from specialty paper manufacturers. Filtration rate of qualitative filter paper is based on retention and thickness specifications, and these factors are related to the speed of filtration processes. Qualitative filter papers are used for qualitative analytical techniques to separate and identify substances.

Quantitative filter paper

Quantitative filter papers, also known as hardened filter papers, are used for quantitative and gravimetric analyses using pressure or vacuum filtration methods, especially when remaining precipitate is to be analyzed – and when minimal ash content is required.

Specialty paper manufacturers use acid wash methods to reduce ash content while achieving a high level of purity. The amount of ash produced by quantitative filter papers after furnace disposal is 0.0009% or less. Ash weight is insignificant and does not impact analytical results.

In addition, quantitative filter papers have superior wet strength in order to endure both pressure filtration and vacuum filtration. Qualitative filter paper by contrast has comparatively low wet strength. However, moisture-strengthened qualitative filter paper is also available for pressure and vacuum filtration.

How is filter paper used in the beer brewing process?

Beer clarification and degassing

The degassing and clarification of wort and beer is an important analytical step in the beer brewing process.

Passing the beer wort through paper filtration clarifies and degasses the sample. Ahlstrom beer filter papers are available in a variety of sizes and folds.

Alcohol content testing

In addition to determining alcohol content for consumption, it is also important to understand alcohol content to monitor fermentation rates as well as demonstrate compliance with legal guidelines and alcohol taxes. Degassing and clarification of the wort are necessary prior to alcohol measurement. Tools to measure alcohol content include the spectroscope and chromatograph.

Wort sample preparation

Ahlstrom beer filter papers facilitate efficient degassing and clarification of brewing wort. Choose from higher rate of particulate removal but with slower filtration times – or a lower rate of particulate removal with a faster filtration time. Ahlstrom beer filter papers are available in a variety of sizes and folds.

Freshness testing

Although the antibacterial qualities of brewing hops inhibit the growth of most microorganisms, certain bacteria strains can impact the flavor and appearance of beer. Taking filter samples is a common method for determining bacterial levels throughout the brewing process. Ahlstrom offers a variety of filters beer brewing quality control.

Color determination

Product color is an important aspect of the brewing process. The removal of all particulates is a crucial sample preparation step prior to color analysis. The most common clarification method is to pass beer and wort samples through a filtration membrane.

Bitterness testing

Bitterness is an essential characteristic of beer flavor. Bitterness is typically measured throughout the brewing process to monitor hop levels in pursuit of the desired flavor profile. International Bitterness Units (IBU) measurement is determined by the concentration of acids in hops.

Carbohydrate testing

Carbohydrates and sugars are important ingredients in the brewing process. Yeast fermentation plays an essential role in the quality of the final product. Clarification, degassing, and filtering are important steps in the preparation of samples.

Nitrogen and protein testing

Nitrogen and protein are integral parts of yeast metabolism, shelf life, texture, and froth. Specialty filter papers are required to ensure purity in test results.

Filter paper filtration

Ahlstrom-Munksjö filtration papers are ideal for filtering wort and beer samples for analytical purposes. Our beer brewing filters are manufactured to laboratory purity standards to ensure testing results are pure and reliable. Filter papers are available in a variety of sized and folds.

Sulfur content testing

Sulfur components often result from the beer brewing process. This can produce undesirable flavors in beer. Filtration is required to ensure accurate measurement of sulfur compounds.

Minerals and solids filtration

Water quality plays an important role in the brewing process. Dissolved solids can have a critical effect on the taste of beer. Ahlstrom-Munksjö offers a wide range of specialized filter papers for purification, testing, and monitoring wort and beer.

What is fluted filter paper?

Fluted filter paper is a type of filter paper that is used in laboratory applications. It is made of cellulose and has a fluted or grooved surface. This surface helps to increase the surface area of the paper, which allows for more efficient filtration. Fluted filter paper is available in a variety of sizes and grades, and it can be used to filter a variety of liquids and solids.

Fluted filter paper is often used in the filtration of solutions. It can be used to remove suspended particles from a solution, or to concentrate a solution. Fluted filter paper can also be used to filter precipitates.

Fluted filter paper is also used in the filtration of solids. It can be used to remove fines from a solid, or to separate two solids from each other. Fluted filter paper can also be used to dry a solid.

What is pleated filter paper?

Pleated filter paper is a type of filter paper that is folded into pleats to increase its surface area. This makes it ideal for use in laboratory applications where a high degree of filtration is required. Pleated filter paper is available in a variety of materials, including cellulose, glass fiber, and paper. It is also available in a variety of pore sizes, which allows it to be used for a variety of applications.

Pleated filter paper is often used in the filtration of liquids. It can be used to filter out suspended particles, such as bacteria or cells, or to remove impurities from liquids. Pleated filter paper is also used in the filtration of gases. It can be used to remove particulate matter from the air, or to remove specific gases from a gas stream.

Pleated filter paper is a versatile and effective tool that can be used in a variety of laboratory applications. It is available in a variety of materials, pore sizes, and configurations, which makes it suitable for a wide range of tasks.

Here are some of the benefits of using pleated filter paper in laboratory applications:

  • Increased surface area: Pleated filter paper has a much greater surface area than flat filter paper. This means that it can filter more material in a shorter amount of time.
  • Improved filtration efficiency: Pleated filter paper can remove smaller particles than flat filter paper. This makes it ideal for applications where a high degree of filtration is required.
  • Durability: Pleated filter paper is more durable than flat filter paper. This means that it can be used for a longer period of time without needing to be replaced.
  • Cost-effectiveness: Pleated filter paper is more cost-effective than flat filter paper. This is because it can be used for a longer period of time and it can filter more material in a shorter amount of time.

If you are looking for a high-quality, effective, and affordable filter paper for laboratory applications, pleated filter paper is an ideal choice.

What are micro filtration membranes, and what are they used for?

Microfiltration membranes are a type of filtration technology designed to separate particles and microorganisms from fluids based on size. These membranes have pore sizes typically ranging from 0.1 to 10 micrometers, making them effective in removing larger particles, bacteria, and other contaminants from liquids. The process of microfiltration involves passing a fluid through a porous membrane, with the smaller particles passing through the membrane while larger particles are retained.

Microfiltration membranes find widespread applications in various industries, playing a crucial role in processes such as water treatment, food and beverage processing, pharmaceutical manufacturing, and laboratory research. One key advantage of microfiltration is its ability to separate particles without significantly affecting the composition of the fluid, making it a gentle and efficient technique.

In water treatment, microfiltration membranes are used to remove suspended solids, bacteria, and other impurities from water sources. This is essential for producing high-quality drinking water and for the treatment of industrial process water. Microfiltration is also employed in the food and beverage industry to clarify and sterilize liquids, such as fruit juices, wine, and dairy products. The membranes help maintain product quality by removing unwanted particles and microorganisms.

In pharmaceutical manufacturing, microfiltration plays a vital role in the purification and sterilization of drugs and biopharmaceuticals. It is used to separate cells, bacteria, and particulate matter from culture media and other liquids in bioprocessing applications. This ensures the safety and efficacy of pharmaceutical products.

Laboratory applications of microfiltration membranes are diverse and include DNA and protein separation, particle analysis, and sample concentration. For instance, in DNA research, microfiltration is used to concentrate DNA samples by retaining the DNA molecules while allowing smaller molecules to pass through. This concentration step is crucial for downstream analysis techniques like polymerase chain reaction (PCR) and DNA sequencing.

In particle analysis, microfiltration membranes are employed to separate and collect particles of specific sizes for further examination. This is valuable in environmental monitoring, where researchers may want to analyze the composition of suspended particles in air or water samples.

Overall, microfiltration membranes offer a versatile and efficient solution for separating particles based on size, making them indispensable in a wide range of industrial and laboratory applications where precision and purity are paramount.

What are extraction thimbles, and how are they used in a laboratory setting?

Extraction thimbles are small, tubular devices used in laboratories for various extraction processes, especially in analytical chemistry and sample preparation. These thimbles are typically made of materials such as cellulose, glass, or other fibrous materials. The primary purpose of extraction thimbles is to hold solid samples during extraction procedures, allowing the extraction solvent to pass through the sample, carrying with it the desired components.

Here's how extraction thimbles are commonly used in a laboratory setting:

Sample Loading

The solid sample is placed inside the extraction thimble. The thimble provides a contained environment for the sample, preventing it from escaping during the extraction process.

Extraction Process

Extraction thimbles are often used in techniques such as Soxhlet extraction. In Soxhlet extraction, a solvent is continuously circulated through the sample. The thimble allows the solvent to pass through the sample, extracting the target compounds.


Extraction thimbles also act as a filtration medium, allowing the solvent to pass through while retaining the solid sample within the thimble. This is particularly useful for separating liquid extracts from solid residues.


Once the extraction is complete, the liquid extract can be analyzed for the presence and concentration of specific compounds.

Additional applications

Extraction thimbles are used for a variety of applications, including environmental analysis, food and beverage testing, pharmaceuticals, and wherever the extraction of compounds from solid samples is required.

Extraction thimbles come in various sizes and materials for different applications. 

How is filter paper used in the chromatography process?

Filter paper is commonly used in chromatography processes as the stationary phase, where it provides a medium for the separation of different components in a mixture. Chromatography is a technique used to separate and analyze complex mixtures based on the differential migration of components through a stationary phase and a mobile phase.

Here's how filter paper is typically used in chromatography:

  • Preparation of the Stationary Phase: Filter paper is chosen for its porous and absorbent nature. The paper is cut into strips or disks and acts as the stationary phase. It is essential to ensure that the paper is cut to a size suitable for the particular chromatography setup.
  • Application of Sample: The sample containing different components is applied to the filter paper. This can be done through various methods such as spotting, where a small amount of the sample is placed on a specific spot on the filter paper. The sample is typically applied as a small, concentrated spot near one end of the paper.
  • Development of Chromatogram: The filter paper, now containing the sample, is placed in a chamber that allows the mobile phase to move through the paper. The mobile phase, which could be a liquid or gas, carries the sample components along with it.
  • Separation of Components: As the mobile phase moves through the filter paper, it carries different components of the sample at different rates. This separation occurs based on the affinity of each component for both the mobile and stationary phases. Components with higher affinity for the mobile phase move faster, while those with higher affinity for the stationary phase move more slowly.
  • Visualization of Bands: After the chromatography process is complete, the filter paper is removed from the chamber. Different components of the sample are now spread out along the paper, forming bands. These bands can be visualized using various techniques, such as exposing the paper to a suitable developer or using UV light. The resulting pattern, called a chromatogram, provides information about the composition of the original mixture.

Filter paper is preferred as a stationary phase in chromatography due to its ability to absorb and hold the sample, allowing for effective separation of components. The technique is widely used in analytical chemistry, biochemistry, and other fields for tasks such as analyzing complex mixtures, identifying substances, and purifying compounds.


What Is Electrophoresis Paper?

Electrophoresis paper, often referred to as blotting paper, plays a pivotal role in the field of molecular biology and biochemistry. This specialized paper is crafted to provide a stable and uniform platform for the separation of macromolecules, such as DNA, RNA, and proteins, through the process of electrophoresis. The unique composition and structure of Electrophoresis Paper are designed to facilitate the efficient transfer and immobilization of these molecules for further analysis.

What is Electrophoresis Paper Commonly Used For?

Electrophoresis Paper from Lab Filtration Papers finds its application in several critical analytical techniques, notably:

  • Genetic Analysis (DNA/RNA Analysis): Electrophoresis paper is indispensable in genetic fingerprinting, sequencing, and cloning, aiding in the identification of genetic disorders, paternity testing, and forensic analysis and supporting both academic and clinical research.
  • Protein Analysis: Our Electrophoresis paper supports the examination of protein purity, molecular weight estimation, and the study of enzymatic activities, crucial for biomedical research and pharmaceutical development.
  • Blotting Techniques: Our Electrophoresis paper is essential in blotting methods, such as Southern, Northern, and Western blotting, which are used for the detection and quantification of specific DNA, RNA, and protein molecules, respectively.

What are the Benefits of Using Electrophoresis Paper from Lab Filtration Papers?

  • Efficiency: Our Electrophoresis paper is known for its high absorbency and uniform pore structure, which guarantee rapid and even capillary action crucial for effective molecule separation.
  • Purity: We ensure our Electrophoresis paper is manufactured from the highest grade materials, free from any contaminants that could compromise your research, ensuring dependable and reproducible results.
  • Versatility: Designed to be adaptable, our Electrophoresis paper supports a broad spectrum of applications, catering to both fundamental research and complex diagnostic needs.
  • Durability: Our Electrophoresis paper is designed to withstand the rigors of electrophoretic techniques, maintaining structural integrity even under extreme conditions of pH and ionic strength.
  • Use Accessibility: With a focus on ease of use, our electrophoresis paper is compatible with standard lab equipment, making it a go-to resource for both seasoned researchers and those new to the field.

Which Industries Stand to Benefit from Electrophoresis Paper?

Lab Filtration Papers' Electrophoresis Paper is instrumental across a wide range of sectors, including but not limited to:

  1. Healthcare and Diagnostics: For disease research, genetic testing, and the development of personalized medicine strategies.
  2. Pharmaceuticals and Biotechnology: In the discovery and quality assurance of therapeutic drugs and biologics, including vaccines.
  3. Forensic Science: Employed in criminal investigations for DNA analysis, as well as in legal contexts for paternity testing and identification purposes.
  4. Environmental Studies: Used in assessing the impact of pollutants on wildlife genetics and in monitoring environmental health.
  5. Agricultural Science: In the genetic engineering of crops for improved yield, disease resistance, and climate adaptability.
  6. Academic Universities and Government Research Institutions: Supporting a broad array of scientific investigations, from basic molecular biology research to applied studies in public health.

At Lab Filtration Papers, we are proud to contribute to the advancement of science and industry through our high-quality Electrophoresis paper. Our commitment to excellence ensures that professionals across diverse fields have access to the tools they need for groundbreaking research and innovation. Our Electrophoresis paper is an indispensable tool in the modern laboratory, facilitating the detailed analysis of biomolecules which is critical for advancing our understanding of biological systems and for the development of new diagnostic and therapeutic strategies. The efficiency, purity, and versatility of Electrophoresis paper make it a valuable asset in the pursuit of scientific discovery and innovation.