PTFE is the “ultimate” high-temperature filter needle-punched fabric. Of all the fibers found in the industry, PTFE has the best combination of chemical and thermal properties.
There are two types of PTFE: white and brown. The fibers become brown due to residues from the manufacturing process. Also, brown fibers have more uniform diameters which are also due to the production process. PTFE is a very dense polymer and from it very thin fibers are produced with the potential to offer effective dust collection. Because the density is very high, the fiber volume is quite low and approximately 850 g / m2 of heavy PTFE fabric is needed to achieve the same amount of fibers as in the 550g / m2 polyester web. The relative specific gravity of the standard PTFE fabric is about 0.65, while for polyester it is 0.30.
PTFE is water repellent (similar chemical compounds in the textile industry are used for waterproof fabrics), therefore applying surface treatments is very uncharacteristic, but nevertheless certain treatments are available that improve dust collection, such as built-in membranes.
In certain processes, especially for incineration, PTFE fibers are supplied mixed with glass fibers for the production of Tefaire ™. The final material can be a very effective filter, since friction and contact between PTFE and glass creates electrical charges on fibers that attract electrically charged dust particles. PTFE becomes negatively charged and the glass becomes positively charged, thus attracting dust particles of opposite polarities.
|Application in the following industries:
Maximum Continuous in Dry Conditions: 260°C
Maximum Surge in Dry Conditions: 280°C
Additional treatments for PTFE fabrics used:
oil and water repellent
oil and water repellent PTFE-based