Welcome to Ultrafilter webshop, log in or create new accountLog out

Billede: 2767 EU
Sterile Air & Steam

Sterile Air & Steam

Steril Luft

Our sterile air filters are all FDA / EC validated and approved for products. “Sterile” means “free from microorganisms, that are capable of reproducing”.

A more scientific meaning of ”sterile” is that a filter is defined as a ”sterile filter”, when it is exposed to a concentration of 107 microorganisms (Brevundimonas Diminuta) pr. Cm2 filter area and the filtrate is 100% sterile and without contents of microorganisms.

Bacteria, like coli and streptococci, typically have a size between 0,3µ and 9µ, which have resulted in the sterile filter having a filtration grade of 0,2µ or better.

P-SMF is a prefilter that is used to protect P-SRF / PTFE sterile filters.

P-SRF is a sterile filter that, with the help of depth filtration, reaches an absolute retention of 99,99998% in comparison to 0,01µm.

PF-PT is a sterile membrane filter that is used in the most critical applications.

There are no items in the selected category

All the sterile filters from Ultrafilter and 3M are validated after the FDA and the EC-1935/2004. These especially effective filters can remove bacteria down to a size of 0,2µm, and exists as a depth-, absolute-, and membrane filter. Billede: 1445    Billede: 1445


A depth filter is typically consisting of multiple layers of metallic, polymeric or inorganic material – typical used a variety of silicon named borosilicate. This type of filter specializes itself by a big filtration capacity and a high stability during operation and sterilization. This type of filter is about 99,9999% effective in comparison to a given µm size.

Membrane filter

A membrane filter is made from polymeric plastic film -typically polypropylene – These filters have a smaller filtration capacity, but here is the guarantee almost 100% retention grade and is available in different filtration grades. 0,1µm, 0,2µm and 0,45µm.


For the food and beverage industry, we recommend a depth filter. For the pharmaceutical industry we recommend a membrane filter. Both types of filters can be used and installed close to “point of use”.

It is recommended to install a central adsorption dryer, as well as microfilters and carbon filters before the sterile filters.


A sterile filter also needs maintenance and should be sterilized after use, and before use.

A sterile filter can be sterilized either in-line with steam, or in an autoclave. However, it is recommended to sterilize a sterile filter after each production batch or as a minimum every 14th day.

The sterilization temperature is between 110°C -140°C in respectively 30 and 10 minutes.

Read the sterilisation guide here.

Bisnode A-rating