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Sterile Gas Filtration & Venting

Liquids and gases are both fluids however there is a significant difference between them. Liquids are mostly non-compressible, whereas gases are compressible. What this means when we are dealing with gases is that their volume is dependent on their pressure and temperature, whereas with liquids their volumes remain almost constant. Therefore, a mass of gas can have a different volume whereas a liquid is almost constant. This significantly impacts the sizing of filters and the initial capital and running costs of a system.

Products to solve your sterile gas filtration challenges.


All fermenters need to be aseptic between inlet gas and off-gas. SurePore Gas provides the barrier to the product and the environment.

PTFE Gas Cartridge Filters

Gas Cartridge Filter Housings

Storage & Product Sterile Tank Vent Filtration

As tanks fill and empty they need to breathe. The gas entering and leaving the tank needs to be sterile filtered. Find out about solutions for challenges vent filters must overcome.

PTFE Gas Cartridge Filters

Tank Vent Filter Housings

Glass Fibre Depth Cartridge Filters

Autoclaves & Lyophilisation

Products, equipment, and tools are sterilised before use in pharmaceutical, hospital and clinical areas. Autoclaves and lyophilisers are used but need sterile air to break the vacuum cycle. Understand how PoreFilter’s range meets these challenges

PTFE Gas Cartridge Filters

Gas Cartridge Filter Housings

Glass Fibre Depth Cartridge Filters

Solutions for sterile gas, tank venting and autoclave vacuum break filtration

In gas filtration there are two key contaminates we need to remove prior to final sterile gas filtration. Firstly, condensate that forms in the transfer lines of the gas if there is any reduction in gas temperature. Secondly, oil and particulate that may already contaminate the gas, dependent on its source, or is added to the gas when it is manufactured, transported, or stored.

Any gas filtration installation needs to remove these contaminates, so that the gas is condensate, oil and particulate free, prior to the sterile gas filter. This then allows the filter to run at low differential pressure and its most efficient at removing microorganisms, bacteria, and viruses so that they cannot be transferred into the process or product that the gas contacts.

Understanding these issues helps ensure the correct filter for the application is chosen and sized correctly, and that once installed, runs without problem in any of the 3 main applications detailed below.

Compressed Gas sterilisation

Sterilization of gases is especially important in fermentation, diaries, breweries where substantial amounts of compressed gas are in contact with the product. Sterile gas filters ensure that microorganisms or bacteria are not introduced to the product when it encounters the gas. SurePore Gas membrane filters are used to remove microorganisms, bacteria, and viruses. These are PTFE membrane filters that when running in dry gas conditions filtering down to 0.02 micron. These are provided in a range of cartridge formats and capsules that allow applications all sizes of to be treated. Healthcare and pharma prefer using membrane gas filtration. Also used are PurePore GF Air pleated depth filter cartridges which have superior flow characteristics compared to PTFE membrane, reducing either initial capital cost or reducing running costs.

Sterile Tank Venting

In many food and beverage manufacturing processes product are held in storage or transfer tanks, we need to ensure these products do not come into contact with spoilage organisms. As storage tanks are filled or emptied they breathe and there is the possibility that airborne contamination - particulate or spoilage organisms - will be drawn into the tank and contaminates the product. To prevent this a vent filter is fitted with either a SurePore Gas or PurePore GF cartridge. If the product in the tank is hot or heated there is likely to be vapour above the product and if this encounters a cold filter condensation will occur, which then causes the filter blinding. To prevent this Porefilter can offer heated housing options.

Autoclaves & Lyophilisation

Products, equipment, and tools are sterilised before use in pharmaceutical, hospital and clinical areas. Both autoclaves and lyophilisers are used to equipment or tools to high pressure saturated steam at 121C or above to kill any bacteria, viruses and spores. As part of their operational cycle there is a need to use sterile air to break the vacuum that develops during the end stage of the sterilisation cycle. Autoclave filters are used to ensure that only sterile air enters the autoclave or lyophiliser chamber. Either SurePore Gas PTFE membranes or PurePore GF depth autoclave filters are available dependent on the end users preference and budget.

How we work with you to get the right solution.

Day 1

We receive your enquiry and identify your requirements.

Day 2

We will evaluate the most suitable products and provide you with a proposal.

Day 3 to 4

Ensure you are happy with the proposal so you can place the order with confidence.

Week 2 to 6

Products will be shipped to you from existing stock or manufactured to your specification.


Ensuring you have the right products in stock when you need them.

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