AM Scientific

Whatman Filter Papers (manufactured by Cytiva/GE Healthcare) are high-quality cellulose-based papers used for filtration in laboratories. They are known for their consistent performance, purity, and precise particle retention, making them a global standard for scientific filtration.

⭐ Key Features

• High purity cellulose → minimal extractables that could interfere with experiments

• Controlled pore size → ensures accurate and reproducible filtration

• Uniform thickness and weight → consistent flow rate and retention

• Available in various grades → used for different filtration needs

• Compatible with chemical analysis, microbiology, and environmental testing

• Popular Whatman Filter Paper Grades & Their Uses1. Grade 1 – General Purpose Filter Paper

  • Pore size: ~11 µm

  • Description: Most widely used paper for routine filtration

  • Applications:

    • Qualitative analysis

    • Removing coarse particles

    • Clarifying solutions

    • Soil, feed, and food testing

  2. Grade 2

  • Pore size: ~8 µm

  • Description: Slower flow with finer retention

  • Applications:

    • Fine precipitate collection

    • Chemical analysis requiring cleaner filtrate

    • 3. Grade 4 – Fast Filtration

      • Pore size: ~20–25 µm

      • Description: Very fast flow; suitable for large particles

      • Applications:

        • Collecting precipitates in environmental testing

        • Rapid filtration of viscous samples

        • Fiber analysis

      4. Grade 40, 41, 42 – Ashless Filter Papers

      Used for gravimetric analysis where residue must be extremely low.

      Grade 40 (Medium)

      • Retention: ~8 µm

      • Application: Moderate-rate quantitative analysis

      Grade 41 (Fast)

      • Retention: ~20 µm

      • Application: Fast filtration of heavy precipitates

      Grade 42 (Fine)

       

      • Retention: ~2.5 µm

      • Application: Fine precipitates (most precise)

      • 5. Whatman GF Glass Fiber Papers

        • Material: Borosilicate glass microfibers

        • Properties: Heat-resistant, high particle loading capacity

        • Applications:

          • Air pollution monitoring

          • Water quality testing

          • DNA/RNA extraction

        �� General Applications of Whatman Filter Papers

         

        • Solution clarification

        • Precipitate collection

        • Gravimetric analysis

        • Environmental water testing

        • Microbiology sample preparation

        • Food and agricultural testing

        • Air pollution monitoring

        • Summary

           

          Whatman Laboratory Filter Papers are reliable, high-performance filtration media used in nearly every type of laboratory. Their wide range of grades, pore sizes, and materials makes them suitable for everything from basic filtration to advanced scientific analysis.

Laboratory filter paper is a semi-permeable cellulose-based medium used to separate solids from liquids/gases, available in grades for general (qualitative) or precise (quantitative/gravimetric) analysis, differing in porosity, strength, and ash content, functioning as a physical barrier by trapping particles while allowing filtrate to pass through, essential for tasks from clarifying solutions to air pollution monitoring. Key Characteristics

• Material: Primarily purified cotton linters (alpha-cellulose) for high purity, but also glass/quartz fibers for special needs.
• Pore Size: Varies widely (e.g., 2.5 µm to 20-25 µm), determining particle retention.
• Strength: Often wet-strengthened to prevent breakage during filtration, especially when removing solid cakes.
• Ash Content: Quantitative grades are acid-washed to be "ashless" (<0.1%), ensuring no residue interferes with gravimetric analysis.
• Forms: Available as discs, sheets, or folded, in smooth or rough surfaces. 

Types & Uses

• Qualitative (General): For routine separation, clarification, biological sample prep; identifies presence/absence of substances.
• Quantitative (Gravimetric): Ashless, high-purity for precise mass determination (e.g., lead sulfate, calcium oxalate).
• Specialty: Glass fiber for high flow/temperature; quartz for extreme heat/chemical resistance. 

How It Works (Basic)

1. Fold/Place: Fold into a cone and place in a funnel.
2. Apply Sample: Pour the mixture (suspension) over the paper.
3. Separate: Liquid (filtrate) passes through; solid (residue/cake) gets trapped. 

Filter paper is a specialized type of paper designed to separate solids from liquids or gases. It's typically made of cellulose fibers and has a specific pore size that allows liquids or gases to pass through while trapping particulate matter. Key Characteristics and Uses: Semi-permeable:Filter paper acts as a barrier, only allowing specific substances to pass through based on their size and properties. Porous:It contains tiny pores that allow liquid or gas to flow through while trapping solids. Separation:Filter paper is used to separate suspended solids from liquids, as well as to filter gases. Various applications:Filter paper is used in laboratories for qualitative and quantitative analysis, as well as in other fields like chromatography and even everyday

General descriptionWhatman Grade 4 Qualitative Filter Papers are a standard grade, high flow rate filter paper.

Excellent retention: captures coarse particles and gelatinous precipitates such as ferric hydroxide and aluminum hydroxide. Fast filtration: useful for routine clean-up of biological fluids or organic extracts during analysis

Grade 4 Qualitative Filter Papers (20-25 µm particle retention) are available in a variety of sizes and formats including circles, sheets, and rolls. They are also available as prepleated filters, which give improved flow rate and increased loading capacity compared to equivalent flat filters.Features and Benefits

• Useful in qualitative analytical separations when Fast flow is required and the collection of fine particles is not critical.
• These cellulose filters are used in qualitative analytical techniques to determine and identify materials (e.g., in air pollution monitoring).

Filter paper is a specialized type of paper designed to separate solids from liquids or gases. It's typically made of cellulose fibers and has a specific pore size that allows liquids or gases to pass through while trapping particulate matter. Key Characteristics and Uses:

• Semi-permeable:Filter paper acts as a barrier, only allowing specific substances to pass through based on their size and properties. 
• Porous:It contains tiny pores that allow liquid or gas to flow through while trapping solids. 
• Separation:Filter paper is used to separate suspended solids from liquids, as well as to filter gases. 
• Various applications:Filter paper is used in laboratories for qualitative and quantitative analysis, as well as in other fields like chromatography and even everyday applications like coffee filters. 
• Made from plant fibers:Filter paper is typically made from plant fibers like cotton linters, which are carefully processed to achieve high purity and ash-free qualities. 
• Different grades and types:Various grades and types of filter paper exist, each tailored to specific applications, such as qualitative analysis, quantitative analysis, ashless filter paper, and more. 

How it Works:When a mixture of solids and liquids is poured through a filter paper, the liquid passes through the pores, leaving the solids behind on the paper. This process is called filtration. Examples of Uses:

• Laboratory filtration: Separating precipitates from liquids during chemical experiments. 
• Coffee making: Used in filter coffee machines to separate coffee grounds from the brewed coffee. 
• Chromatography: Used to separate different components of a mixture. 
• Air filtration: Used in various devices to filter air, like in car engine oil filters and air filters in buildings.

Whatman Grade 41 filter paper circles, 125 mm in diameter, are ashless qualitative filter papers known for their fast filtration speed and suitability for quantitative air and soil pollution analysis. They are designed for analytical procedures involving coarse particles or gelatinous precipitates and can be used for preparing samples for metal analysis after nitric acid digestion. Key characteristics of Whatman Grade 41 circles (125 mm):

• Ashless: Made from pure cellulose with extremely low ash content, making them suitable for quantitative analysis. 
• Fast Filtration: Grade 41 is one of the fastest filter papers in the Whatman ashless range, with a filtration speed of 54 seconds (Herzberg). 
• Particle Retention: They have a nominal particle retention rating of 20 μm. 
• Applications: Primarily used for routine air and soil pollution analysis, as well as for preparing samples for metal analysis following nitric acid digestion. 
• Quantitative Analysis: Well-suited for quantitative analysis where high flow rates are needed. 

Whatman Grade 42 filter paper is an ashless, quantitative filter paper with the finest particle retention among Whatman cellulose filter papers. It is a 125mm diameter filter, designed for critical gravimetric analysis and sample preparation for instrumental analysis. The filter paper is acid hardened for high wet strength and chemical resistance, and has a very low ash content (0.007% nominal). Key features and characteristics:

• Ashless: The filter paper is ashless, meaning it has a very low ash content (0.007% nominal) after ignition, making it suitable for quantitative analysis. 
• Fine particle retention: Grade 42 has the finest particle retention of all Whatman ashless filter papers, making it suitable for capturing very small particles. 
• Gravimetric analysis: It's a standard for critical gravimetric analysis, commonly used for separating and weighing precipitates. 
• Instrumental analysis: It's suitable for sample preparation for instrumental analysis. 
• Hardened: The filter paper is hardened to provide high wet strength and chemical resistance. 
• Typical applications: Includes filtration of barium sulfate, metastannic acid, and finely precipitated calcium carbonate. 
• Equivalent to: Whatman Grade 42 is equivalent to Munktell 393 and Schleicher & Schuell 589/6. 
• Filtration speed: It has a slow filtration speed of 1870 s/100ml. 
• Size: 125mm diameter. 
• Pack size: Available in packs of 100. 

Whatman Grade 41 filters are suitable for quantitative air pollution analysis as a paper tape for impregnation when determining gaseous compounds at high flow rates. Grade 41 filters are also commonly used in preparing solid environmental samples (e.g., soils, sludges) for metals analysis after nitric acid digestion. The Whatman 1441-125 is a 12.5cm diameter, Ashless Grade 41 quantitative filter paper used for fast filtration of coarse particles and gelatinous precipitates. It is made of cotton linters, has a particle retention of 20µm, and is suitable for analytical procedures and air pollution analysis. 

•  
  • Product Name: Whatman 1441-125 Ashless Quantitative Filter Paper, Grade 41
  • Diameter: 12.5 cm (125 mm)
  • Pore Size/Particle Retention: 20 µm
  • Material: Ashless cotton linters
  • Filtration Speed: It is the fastest ashless filter paper available, with a Herzberg filtration speed of 54 seconds
Product specifications and features

•  
  • Common Applications:
    • Analytical procedures involving coarse particles or gelatinous precipitates (such as iron or aluminum hydroxides)
    • Quantitative air pollution analysis as a paper tape for determining gaseous compounds at high flow rates
    • Soil analysis 

hatman Grade 5 filter paper, with a 110mm diameter, is a qualitative filter paper known for its high particle retention and slow flow rate. It's designed to retain fine precipitates in qualitative analytical techniques and is also suitable for clarifying cloudy suspensions and in water and soil analysis. Key Features:

• Grade 5: Indicates the highest degree of fine particle retention within the qualitative filter paper range. 
• 110mm Diameter: A standard size for various laboratory applications. 
• Qualitative Analysis: Primarily used for determining and identifying materials in qualitative analytical techniques. 
• Particle Retention: 2.5µm, meaning it can retain particles of that size or larger. 
• Slow Flow Rate: Due to its high retention, the flow rate is slower compared to other Whatman grades. 
• Applications: Clarifying cloudy suspensions, water and soil analysis, and general laboratory filtration

Whatman filter papers are made from high-quality materials and are used in a variety of applications, including qualitative and quantitative analysis. They are available in different grades, each with specific properties and uses: 

• Grade 1A medium flow filter paper with medium retention. It's commonly used for clarifying liquids, soil analysis, seed testing, and separating solid foodstuffs from liquids. 
• Grade 542A fine filter paper made from cotton linters with a nominal particle retention rating of 2.7 μm. It's used for capturing fine precipitates, collecting trace elements and radionuclides, and gravimetric metal determinations. 
• Quartz fiberA high-purity quartz microfiber filter used for air sampling, particularly at high temperatures. It's used for PM2.5/PM10 and trace element analysis. 

Whatman filter papers are categorized by grades based on various properties, including thickness, weight, and particle retention. The most common qualitative paper grades are 1-6, 595, 597, 598, and 602. 

General descriptionWhatman Grade 4 Qualitative Filter Papers are a standard grade, high flow rate filter paper.

Excellent retention: captures coarse particles and gelatinous precipitates such as ferric hydroxide and aluminum hydroxide. Fast filtration: useful for routine clean-up of biological fluids or organic extracts during analysis

Grade 4 Qualitative Filter Papers (20-25 µm particle retention) are available in a variety of sizes and formats including circles, sheets, and rolls. They are also available as prepleated filters, which give improved flow rate and increased loading capacity compared to equivalent flat filters.Features and Benefits

• Useful in qualitative analytical separations when Fast flow is required and the collection of fine particles is not critical.
• These cellulose filters are used in qualitative analytical techniques to determine and identify materials (e.g., in air pollution monitoring).

Other NotesField of Use : For internal research use only. Products are not intended for diagnostic use or resale.Legal InformationWhatman is a registered trademark of Cytiva

Whatman high-purity extraction thimbles are designed for accurate and reproducible emission testing, particularly in applications involving high temperatures and potential solvent incompatibility. They are manufactured from high-purity borosilicate glass microfiber or quartz, offering low extractable levels and resistance to temperatures up to 500°C or 800°C, respectively. These thimbles are binder-free and free of chemical additives, making them suitable for various analytical techniques like Soxhlet extraction, pollution monitoring, and pesticide residue analysis. Key Features:

• High Purity Materials: Made from 100% pure borosilicate glass microfiber or quartz, ensuring low extractable levels. 
• Temperature Resistance: Suitable for use at high temperatures, up to 500°C for glass and 800°C for quartz thimbles. 
• Binder-Free: Completely free of binders and chemical additives, preventing interference with analyses. 
• Versatile Applications: Ideal for Soxhlet extraction, pollution monitoring (including hot and acidic gases), pesticide residue analysis, and determining oil/fat content. 
• Solvent Compatibility: Can be used with solvents that are incompatible with cellulose thimbles. 
• Nominal Particle Retention: Typically have a nominal particle retention rating of 0.8 µm. 
• Variety of Sizes and Wall Thicknesses: Available in various dimensions to fit different Soxhlet extractors. 

Whatman high-purity extraction thimbles are designed for accurate and reproducible emission testing, particularly in applications involving high temperatures and potential solvent incompatibility. They are manufactured from high-purity borosilicate glass microfiber or quartz, offering low extractable levels and resistance to temperatures up to 500°C or 800°C, respectively. These thimbles are binder-free and free of chemical additives, making them suitable for various analytical techniques like Soxhlet extraction, pollution monitoring, and pesticide residue analysis. Key Features:

• High Purity Materials: Made from 100% pure borosilicate glass microfiber or quartz, ensuring low extractable levels. 
• Temperature Resistance: Suitable for use at high temperatures, up to 500°C for glass and 800°C for quartz thimbles. 
• Binder-Free: Completely free of binders and chemical additives, preventing interference with analyses. 
• Versatile Applications: Ideal for Soxhlet extraction, pollution monitoring (including hot and acidic gases), pesticide residue analysis, and determining oil/fat content. 
• Solvent Compatibility: Can be used with solvents that are incompatible with cellulose thimbles. 
• Nominal Particle Retention: Typically have a nominal particle retention rating of 0.8 µm. 
• Variety of Sizes and Wall Thicknesses: Available in various dimensions to fit different Soxhlet extractors. 

Cytiva's Whatman filter paper Grade GF/C glass filters offer a good flow rate and loading capacity that support total suspended solids analysis.Filter Paper for Total Suspended Solids:

Whatman binder free glass microfiber filter grade GF/C from Cytiva is widely used as a total suspended solids filter for applications testing both potable water and waste water.

The Whatman 1822-037 Grade GF/C glass microfiber filter is a binder-free filter paper with a 1.2µm particle retention and a 37mm diameter. It's made of borosilicate glass and is commonly used for various applications, including total suspended solids (TSS) analysis in water and wastewater, cell harvesting, liquid scintillation counting, and binding assays according to scientific filters and Amazon. Here's a more detailed breakdown: 

• Particle Retention: 1.2µm
• Diameter: 37 mm
• Material: Borosilicate glass
• Binder: Binder-free
• Typical Applications:
  • Total Suspended Solids (TSS) analysis in water and wastewater
  • Cell harvesting
  • Liquid scintillation counting
  • Binding assays
  • Air and gas filtration
  • Gravimetric analysis of volatile materials
• Key Characteristics:
  • Good flow rate
  • High loading capacity
  • High absorbency
  • Increased wet strength

Whatman Grade 1 Qualitative Filter Papers are the most widely used filter paper for routine laboratory applications, qualitative analytical separations, and clarifying liquids. They are the standard grade cellulose filter papers for medium flow rates.

• Qualitative analytical separations for precipitates such as lead sulfate, calcium oxalate (hot), and calcium carbonate
• Agricultural soil analysis and seed testing procedures
• Industrial food processing techniques to extract liquid or separate solid foodstuffs from associated liquid
• Air pollution monitoring by collecting atmospheric dust from airflow and photometrically measuring the stain-intensity
• Gas detection by quantitative chromogenesis with optical reflectance

Grade 1: 11 μm (medium flow filter paper)

• The most widely used filter paper for routine applications with medium retention and flow rate
• Extended range of sizes includes 10 to 500 mm diameter circles and 460 x 570 mm sheets.

Laboratory Application

This grade is frequently used for clarifying liquids. Traditionally the grade is used in qualitative analytical separations for precipitates such as lead sulfate, calcium oxalate (hot), and calcium carbonate.

Agricultural and Food Industry Application

Grade 1 is used for numerous routine techniques to separate solid foodstuffs from associated liquid or extracting liquid and is widely used in education for teaching simple qualitative analytical separations.

Air Pollution Monitoring

Using circles or rolls, atmospheric dust is collected from airflow and the stain-intensity measured photometrically.

For gas detection, the paper is impregnated with a chromogenic reagent and color formation quantified by optical reflectance.

Whatman filter papers are made from high-quality materials and are used in a variety of applications, including qualitative and quantitative analysis. They are available in different grades, each with specific properties and uses: 

• Grade 1A medium flow filter paper with medium retention. It's commonly used for clarifying liquids, soil analysis, seed testing, and separating solid foodstuffs from liquids. 
• Grade 542A fine filter paper made from cotton linters with a nominal particle retention rating of 2.7 μm. It's used for capturing fine precipitates, collecting trace elements and radionuclides, and gravimetric metal determinations. 
• Quartz fiberA high-purity quartz microfiber filter used for air sampling, particularly at high temperatures. It's used for PM2.5/PM10 and trace element analysis. 

Whatman filter papers are categorized by grades based on various properties, including thickness, weight, and particle retention. The most common qualitative paper grades are 1-6, 595, 597, 598, and 602. 

Whatman filter papers are made from high-quality raw materials and are used for a variety of applications, including qualitative and quantitative analysis. They are categorized by grades based on properties such as thickness, weight, and particle retention. Some examples of Whatman filter papers include: 

• Qualitative filter papersThese are general purpose filter papers used for analytical separations and qualitative analytical techniques. The most common grades are 1-6, 595, 597, 598, and 602. Grade 1 is the most widely used for routine applications. 
• Whatman Grade 542 filter paperThis filter paper is made from cotton linters and has a nominal particle retention rating of 2.7 μm. It is acid-hardened for high wet strength and chemical resistance. 
• Whatman Quartz Fiber Filter PapersThese high-purity quartz microfiber filters are used for air sampling in acidic gases, stacks, flues, and aerosols. They can be used at temperatures up to 800°C. 
• Grade 2 filter paperThis filter paper is more retentive than Grade 1, with an equivalent increase in filtration time. It is used for plant growth trials and contaminant monitoring in air and soil.