Many industrial field require filter media for the solid-liquid separation (such as waste water treatment or recovery of active principles in pharmaceutical industry). The filter media, act as suitable physical barriers for the particles in the liquid suspension (at a certain pressure gradient). The fiber choice of the filter media is strictly linked to the technical requirements of the application and of the process itself: the resistance to the chemical environment is the main constraint.

Testori produces rolls of fabrics and needlefelts in different length and width according to the customer needs:

  • Loom state fabric width from 110 to 295cm
  • Areal weight from 100 g/m² to 700 g/m²

 COTTONPPPESPAPVDFPMIAPPSPTFEPEEK
Polymer cellulose polypropylene polyethylene terephthalate polyamide polyvinylidene fluoride meta-aramid polyphenylene sulphide polytetra fluorethylene polyether ether ketone
chemical resistance strong acids ° °°°° °°° ° °°°° °° °°°° °°°° °°°
chemical resistance weak acids °° °°°° °°°° °° °°°° °°° °°°° °°°° °°°°
chemical resistance strong alkalis °°° °°°° ° °°° °°°° °°° °°°° °°°° °°°°
chemical resistance weak alkalis °°°° °°°° °° °°°° °°°° °°° °°°° °°°° °°°°
chemical resistance oxidizing agents °° ° °°°° °° °°°° °°° ° °°°° °°°°
hydrolysis (moisture, heat) °°° °° ° °° °°°° °° °°° °°°° °°°°
fiber specific solvents H2SO4 hydrocarbon chlorinated solvents H2SO4 C6H5NO2 C6H5OH CH3COOH  HCOOH  H2SO4 C6H5OH HF H2SO4 Strong acids HNO3 HF H2SO4
moisture absorpition 20°C H.R. 65% 7-8 0,05 0,4 0,5-4 0,04 5-6 0,6 0,015 0,1
max continuous temperature °C 90-100 80-100 140 100-110 110 200 180-190 240-260 250