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1.WHAT IS SURFACE FILTRATION?

Surface filtration and excellent cleanability allow Tetratex ePTFE membranes to be used in all filtration applications, where initial high efficiency and pressure drop are important. Due to the hydrophobic nature of PTFE, virtually all Tetratex membranes become washable and thus like “new” after cleaning. This offers tremendous value to customers in terms of cost of filtration over the life of filter. Conventional depth media can only be used until they are plugged and then have to be replaced. Filters used in vacuum cleaners are one such example where ePTFE is replacing traditional glass media for the reasons mentioned above. Unless ePTFE is mechanically damaged, the filter can be a “life-time washable filter”.


2.WHY IS A MEMBRANE SUPERIOR TO DUST CAKE FORMATION AS A FILTER AID?

Building a dust cake on the surface of a filter bag in order to increase the fine particle collection efficiency of the fabric allows the ingress of some particulate into the filter media which increasingly reduces the fabric permeability, allows for particle migration and emission through the media and decreases the effectiveness of the cleaning mechanism. 

Tetratex membrane filter media prevents particle ingress, preserves the integrity of the substrate, maintains reduced constant pressure drop, which allows for increased airflow at the same or reduced energy consumption. 


3.WHAT IS HYDROLYSIS?

This is defined as a chemical process of decomposition that involves splitting of molecular bonds and the addition of elements of water. Hydrolysis only becomes active in the presence of elevated temperature, moisture and chemistry (Acidic or Alkaline). It is a major cause of failure of filter media.


4.DOES THE MEMBRANE AFFECT THE CONDUCTIVITY OF TETRATEX ANTISTATIC MEDIA?

No; tests carried out by an independent and approved test house show that the electrical resistivity of conductive substrates when bonded to Tetratex ePTFE membranes, satisfy the requirements of the DIN 54345 test standards.