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 through the fluids ca 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 an broad range of laboratory applications. There are two fundamental types of filter paper: quantitative and qualitative.

Why is Ahlstrom-Munksjö the best laboratory filter paper available?

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 though 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 an 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.