Micro Filtration Membranes and Syringe Filters

Micro filtration membranes and syringe filters are essential laboratory filtration products used for particle removal, sample clarification, and sterilization of liquids and gases in analytical, pharmaceutical, environmental, and research applications.

Description

Microfiltration membranes are thin, porous films designed to remove particles, microorganisms, and suspended solids, typically in the 0.1–10 µm range.

Common Membrane Materials

Cellulose Acetate (CA) – low protein binding, high flow rates
Mixed Cellulose Ester (MCE) – high bacterial retention, colony counting
Nylon (Polyamide) – compatible with aqueous and organic solvents
Polyethersulfone (PES) – high flow, low protein adsorption
PTFE – hydrophobic, ideal for aggressive solvents and gases

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Description

Membrane Type	Description	Chemical Compatibility	Max. Operating Temperature	Sterilization Methods
Cellulose Acetate (CA)	Low protein-binding; well suited for sterile filtration and clarification of aqueous solutions, nutrient media, buffers, and sera. Provides superior chemical resistance to alcohols and oils. Hydrophilic with excellent flow rates.	Resistant to aqueous solutions, pH 4–8; resistant to most alcohols, oils, and other organic solvents	180 °C	Autoclaving at 121 °C or 134 °C, dry heat, gamma radiation (25 kGy), ethylene oxide
Cellulose Nitrate / Mixed Cellulose Ester (MCE)	Primarily cellulose nitrate with a smaller percentage of cellulose acetate for improved stability. Effective bacterial retention, high flow rates, suitable for colony counting.	Resistant to aqueous solutions, pH 4–8; resistant to hydrocarbons and some solvents	130 °C	Autoclaving at 121 °C, gamma radiation (25 kGy), ethylene oxide
Nylon (Polyamide)	Hydrophilic membranes widely used for aqueous and organic solvent filtration. Suitable for sterilization and clarification of buffers and nutrient media with low extractables.	Resistant to many solvents and alkaline solutions; pH 3–14	100 °C	Autoclaving at 121 °C or 134 °C, ethylene oxide
Polyethersulfone (PES)	Uniform pore structure with high mechanical stability; chemically inert. Excellent flow rates for critical filtration requiring high throughput and very low protein adsorption.	Resistant to some solvents and aggressive aqueous solutions; pH 1–13	200 °C	Autoclaving at 121 °C or 134 °C, gamma radiation (25 kGy), ethylene oxide
PTFE	Permanently hydrophobic; ideal for air and gas filtration. Extremely resistant to aggressive solvents and acids; suitable for liquid and gas samples.	Resistant to solvents, acids, and bases	200 °C	Autoclaving at 121 °C or 134 °C, ethylene oxide

ypical Applications

Sterile filtration of buffers and media
Sample clarification
Microbiological testing
Environmental and water analysis
Pharmaceutical and biotech processing

Syringe Filters

Description

Syringe filters are ready-to-use disposable filters combining a microfiltration membrane with a plastic housing, designed for small-volume sample filtration using a standard syringe.