The chemical and physical properties of the fibres have an essential influence on the efficiency and service-life of the filter medium. Chemical, thermal and physical effects can impact the different kinds of fibres in many and various ways. Knowing the fibre characteristics, we are able to provide optimal solutions with regard to efficiency and process conditions. The table below will be of assistance for fibre selection.
| Property | Cellulose Blend | Polypropylene | Polyester | Acrylic | PPS | Aramid | P&4 | Coated Glass | PTFE Felt |
|---|---|---|---|---|---|---|---|---|---|
| Max Continuous Operating Temp | 200Β°F (93 Β°C) | 170 Β°F (77 Β°C) (some refs 90-100 Β°C) |
275 Β°F (135 Β°C) | 265 Β°F (130 Β°C) | 375 Β°F (190 Β°C) | 375- 400 Β°F (190- 204 Β°C) | 500 Β°F (260 Β°C) | 500 Β°F(260Β°C) (can be designed to go up to 290 Β°C) | 500 Β°F(260 Β°C) (PTFE can go slightl y higher ) |
| Abrasion Resistance | Good | Good-Excellent | Excellent | Good | Good | Excellent | Fair | Poor (Brittle fiber, needs coating) | Fair-Good |
| Energy Absorption /Mechanical | Good | Good | Excellent | Good | Good | Good | Fair | High tensile, but fair flex(Brittle) | Fair |
| Filtration Properties | Good | Good | Good-Very Good | Good | Excellent | Excellent | Excellent(fine fiber structure) | Excellent | Excellent (esp. with PTFE membrane) |
| Moist Heat Resistance | Fair-Poor | Fair Good(Week in steam) | Poor (hydrolyzes in humidity) | Fair Good | Good( hydrolysis resisters) | Good | Poor-Moderate sensitive to hydrolysis | Excellent | Excellent |
| Alkaline Resistance | Poor | Excellent | Fair (week in strong alkali) | Fair | Excellent | Good | Fair-Good(not always excellent at high T) | Good with coating | Excellent |
| Acid Resistance | Poor | Excellent (accept strong oxidizers | Fair | Good | Excellent | Moderate (degrades in strong mineral acids) | Excellent (esp. acids) | Excellent with coating | Excellent |
| Oxygen/ Oxidation stability | Fair-Good | Moderate (oxidizes at temp) | Good | Good-Excellent | Poor (>15% O above 375 Β°F not recommended) | Good | Excellent | Excellent | Excellent |
| AFR Suitability (Alt.Fuels /Raw) | Not Suitable | Not Suitable | Limited-only dry/ low Sox/Nox conditions | Limited-only dry/ low Sox/Nox conditions | Moderate | Limites-Sensitive to acid condensation | Moderate (susceptible with moisture/alkali | High (with protective coating) | Very High |