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:
COTTON | PP | PES | PA | PVDF | PMIA | PPS | PTFE | PEEK | |
---|---|---|---|---|---|---|---|---|---|
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 |