Hydraulic method, also known as isobaric method or rubber-bag method
2025-08-30
The hydraulic method, also known as the isobaric method or rubber-bag technique, is a specialized approach used in the production of PTFE products. It involves applying hydraulic pressure to a rubber bag, which then forces the PTFE resin to expand uniformly into the mold, compacting it before undergoing sintering to form the final product. The process typically proceeds as follows: Place the rubber bag inside the outer mold, connect it to a water pump, and slowly fill it with tap water until the bag expands into a cylindrical shape. Next, evenly add the PTFE resin between the bag and the outer mold, close the mold, and continue pumping water to gradually increase the pressure—reaching 12–13 MPa—and hold this pressure for 30 minutes before releasing the water. Finally, reduce the pressure, carefully remove the mold, sinter the preform, and allow it to cool, resulting in a smooth-surfaced semi-finished product.
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