ePTFE is stretched to form a micro-porous fiber network, which is flexible and conforms to the flange surface. It can be sealed at low pressure
Expanded PTFE (ePTFE) is a sealing grade of PTFE (Teflon). Micro-porous expanded PTFE, with its flexible adhesion and low sealing stress, is the main force for sealing flanges and valves under wide working conditions.
ePTFE is stretched to form a micro-porous fiber network, which is flexible and conforms to the flange surface. It can be sealed at low pressure, and its chemical resistance and temperature resistance range covers almost all media.
Expanded PTFE (ePTFE) grades are often used in the following fields and scenarios. Our CNC machining services can provide customized parts for these industries.
Expanded PTFE (ePTFE) demonstrates the following core advantages in CNC machining and end applications.
The following are the key process points for processing expanded PTFE (ePTFE) grades to ensure the quality of parts and processing efficiency.
Select sharp single-edge or double-edge carbide tools with large relief angles, positive rake angles, and polished cutting edges. The fiberglass/carbon fiber-filled grades need to be equipped with wear-resistant coated blades.
High-speed, medium-low feed, and small-depth layer-by-layer cutting are carried out. The cutting temperature must be strictly controlled below the material's softening point to prevent melting and tool sticking.
Give priority to compressed air or cold air cooling; Most plastics are not suitable for coolant (as it can easily induce stress cracking), and only atomization lubrication should be used when necessary.
Low clamping force in combination with soft claws or vacuum suction cups prevents deformation and indentation of thin-walled parts. Pay attention to the state adjustment of moisture-absorbing materials (such as nylon) before processing.
The coefficient of thermal expansion of plastics is large, and CMM needs to be measured in a constant temperature environment. Focus on internal stress, surface quality and dimensional stability.
Besides Expanded PTFE (ePTFE, PTFE (Teflon) offers several other grades with different characteristics. Click to view details.
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