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Whatman polytetrafluoroethylene membrane filters

Why SECO partner and recommend Whatman membrane filters?

We recommend Whatman PTFE membrane filters from Cytiva for their unmatched performance, durability, and versatility in a wide range of applications.

Explore our range of PTFE membrane filters from Cytiva to find the optimal filtration solution for your specific needs.

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How to choose the right PTFE membrane filter for your applications?

Choosing the right PTFE membrane filter involves considering your specific application requirements, chemical compatibility, and the operational conditions of your process. Here's our step-by-step recommendations:

1. Determining the right pore size and diameter
   • Membrane filter pore size: Choose a pore size that matches your specific filtration needs. For example, a 0.2 µm pore size is ideal for sterilizing liquids and gasses, while a 0.45 µm pore size is suitable for general-purpose filtration and sample clarification.
   • Membrane filter diameter: Chosen based on the volume of the sample and the filtration setup. For example, the 25 mm diameter membrane filters are ideal for small-scale filtration tasks, such as sample preparation and syringe filtration in research labs or during field testing where portability is crucial. While 90 mm diameter and larger filters are designed for high-volume filtration tasks in industrial and environmental applications.
2. Ensure chemical compatibility with substances
   • Verify that the PTFE membrane is compatible with the chemicals you will be filtering. PTFE is known for its resistance to a wide range of solvents, acids, and bases, making it suitable for many applications. Always check the chemical compatibility charts or consult with SECO's technical support to ensure optimal performance and safety.
3. Selecting PTFE membrane filters for your operational conditions
   • Temperature resistance: Ensure the PTFE membrane can withstand the temperatures involved in your process. Whatman PTFE membranes are temperature resistant up to 120°C
   • Pressure compatibility: Consider the pressure conditions of your filtration system. Ensure that the chosen filter can handle the operational pressures without compromising its integrity or performance.

Explore our product range to find the ideal filters for your laboratory or industrial processes.

Don't forget to register your organization's account with preferred pricing to maximize your budget.

Can't find the equipment you need? Let us help!

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Wide range of polytetrafluoroethylene membrane filters available

We offer a comprehensive range of PTFE membrane filters to meet your diverse applications. Whether you require specific pore sizes or various diameters and formats, our selection of high-quality PTFE membrane filters ensures that you can find the perfect solution for your filtration applications.

Why do we only carry hydrophobic PTFE membrane filters and not hydrophilic membrane filters?

Hydrophilic PTFE membranes are treated to allow water to pass through, and they are only suitable for filtering aqueous solutions, including biological samples and water-based chemicals.

Hydrophobic PTFE membranes repel water while allowing air and gas to pass through, making them ideal for applications involving non-aqueous liquids and gasses.

Hydrophobic polytetrafluoroethylene membrane filters are used for filtering aggressive solvents, acids, bases, and in air and gas sterilization processes. Perfect for applications where moisture resistance is critical.

Polytetrafluoroethylene membrane filter pore sizes and their specific applications

• 0.1 µm pore size: Suitable for sterile filtration of liquids and gasses, removing bacteria and particulates in pharmaceutical and biotechnology applications.
• 0.2 µm pore size: Commonly used for sterilizing filtration in the pharmaceutical industry and for environmental testing to remove bacteria and fine particles.
• 0.45 µm pore size: Ideal for general-purpose filtration, including sample clarification, particle removal from solvents, and ensuring product purity in food and beverage processing.
• 1.0 µm and larger pore sizes: Used for coarse filtration tasks, such as pre-filtration of samples, protecting analytical instruments, and filtering larger particulates from liquids and gasses.

PTFE membrane filter diameters and their specific applications

• 25 mm diameter: Ideal for small-scale laboratory filtration, such as sample preparation and syringe filtration.
• 47 mm diameter: Widely used for analytical testing and environmental monitoring, including air sampling and particulate matter analysis.
• 90 mm diameter and larger: Suitable for large-scale filtration tasks in industrial applications, including chemical processing, wastewater treatment, and bulk solvent filtration.

Explore our product range to discover the ideal filters for your laboratory or industrial processes.

Can't find the equipment you need? Let us help!

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PTFE membrane filters for ASTM and EPA tests

There are specific ASTM and EPA tests for petroleum, chemical processing, and water analysis that require the use of PTFE membrane filters. Here's your comprehensive guide:

ASTM D6304 - Standard Test Method for Determination of Water in Petroleum Products, Lubricating Oils, and Additives by Coulometric Karl Fischer Titration

This test measures the water content in petroleum products. PTFE membrane filters are used to remove particulates from the samples before titration, ensuring accurate moisture content measurement.

ASTM D7678 - Standard Test Method for Total Petroleum Hydrocarbons (TPH) in Water and Wastewater with Solvent Extraction Using Mid-Infrared Spectroscopy

Determines the concentration of total petroleum hydrocarbons in water and wastewater. PTFE filters are used during the solvent extraction phase to separate particulates from the sample, ensuring precise infrared spectroscopy analysis.

EPA Method 1664B - Oil and Grease by Hexane Extraction and Gravimetric Determination

Measures oil and grease in water and wastewater. PTFE filters are used to filter out particulates before the hexane extraction process, ensuring accurate measurement of oil and grease content.

EPA Method 552.2 - Determination of Haloacetic Acids and Dalapon in Drinking Water by Liquid-Liquid Microextraction, Derivatization, and Gas Chromatography with Electron Capture Detection

Detects haloacetic acids and dalapon in drinking water. PTFE filters are used to remove particulates from water samples prior to extraction and analysis, ensuring the reliability of the results.

EPA Method 300.0 - Determination of Inorganic Anions by Ion Chromatography

Measures inorganic anions such as fluoride, chloride, nitrate, and sulfate in drinking water. PTFE filters are used to filter out particulates from the water samples before ion chromatography analysis, ensuring accurate detection of anions.

PTFE membrane filters are essential for several ASTM and EPA testing methods in various industries. SECO provides high-quality PTFE membrane filters suitable for these critical applications, ensuring compliance with industry standards and regulatory requirements.

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Polytetrafluoroethylene membrane filter maintenance and usage tips

Guidelines for handling PTFE membrane filters

• Handle filters with clean gloves to prevent contamination. Always hold the filter by its edges, avoiding contact with the membrane surface.
• Install the membrane carefully into the filtration apparatus to prevent damage or deformation.

PTFE membrane filter cleaning and potential reuse

• Clean the PTFE membrane filters using compatible solvents. Rinse thoroughly with distilled water or the appropriate cleaning solution to remove residues.
• PTFE membranes are durable, their reuse depends on the application and the extent of contamination. For critical applications, use new, sterile PTFE membrane filters to ensure accuracy and reliability.

Best practices for storing polytetrafluoroethylene membrane filters

• Store PTFE membrane filters in a clean, dry environment away from direct sunlight and extreme temperatures. Use protective covers or containers to prevent dust and contaminants from settling on the filters.
• Label stored filters with relevant information, such as the pore size and date of receipt, to ensure proper usage and inventory management.

By following proper handling, cleaning, and storage guidelines, you can extend the life and maintain the integrity of your filters. SECO offers a wide range of high-quality PTFE membrane filters to meet your diverse filtration needs, ensuring reliable and efficient performance in all your applications.

Can't find the equipment you need? Let us help!