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Syringe Filters

Syringe filters are attached to the end of a syringe; they are used as a filtering mechanism for many different substances. Typically, syringe filters are attached using a Luer lock fitting. Syringe filters are used with or without a needle; it depends on what they are being used for.

A syringe filter consists of a plastic housing on the outside; inside, it contains a membrane that acts as a filter. Liquids are filtered through the membrane when they are drawn thorough a syringe; they can also be filtered when they are forced out of a syringe. 

The membrane of a syringe filter is usually made up of treated materials like Polytetrafluoroethlene or nylon; the plastic housing is usually made up of a hardened plastic like nylon or polypropylene. The most commonly used syringe filters have a diameter of 25 mm.

Syringe filters are mostly used in a laboratory environment; they make removing particles and impurities from liquids a cinch. Typically, syringe filters are used to prepare solutions that need quick and effective filtration.

What are the most commonly used syringe filters?

Cellulose Membrane

Cellulose filters are ideal for biological samples. Cellulose is hydrophilic; this makes for an excellent cutoff effect. It offers low protein binding coefficients and excellent flow rates for biological samples.

PTFE (Polytetrafluoroethlene) Membrane

If filtering acids, bases and strong chemicals, you need to use PTFE filters; they are also used for filtering gases and air. PTFE filters have a broad chemical and thermal compatibility; you can use them with many different substances.

Nylon Membrane

Nylon filters are very stable; they are compatible with a variety of esters, alcohols and bases. Nylon syringe filters are hydrophilic; this makes them ideal for dissolution sample analysis. Nylon's excellent flow characteristics and mechanical stability allow these filters to meet the most stringent analytical needs.

PVDF (Polyvinylidene Difluoride) Membrane

PVDF syringes are designed for sample prep and cleanup; they are typically used with protein-based samples that have a high non-specific bonding rate. This hydrophobic membrane can be used in many different applications.

Syringe filters are an inexpensive way to filter substances; they are mostly used when a low level of liquid filtration is needed. Special syringes can be used to filter gases and air; you can also buy syringes that filter pathogens from biological samples.

If working with microbiological or medicinal samples, syringe filters need to be sterilized. If using them for other purposes, they do not need to be as clean. Syringe filters allow people to filter low volumes of liquids and other substances without spending a ton of money on filtration devices.

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