PFA (a copolymer of tetrafluoroethylene and perfluoroal […]
PFA (a copolymer of tetrafluoroethylene and perfluoroalkyl vinyl ether), a fusible PTFE, can be injection molded. Its processing temperature is wide, up to 425 ° C, its decomposition temperature is above 450 ° C, the general control processing temperature range is 330-410 ° C.
The hygroscopicity of PFA is very small, 0.03%, so there is no need to dry. Before injection, the insert should be preheated to about 140 °C, and the temperature of the three sections of the injection barrel is: 200-210, 300-310, 350-410 °C, The nozzle temperature is slightly lower than the maximum temperature of the barrel, the mold temperature is 140-230 ° C, the injection pressure is 40-90 MPa, the injection speed should be slightly slower, and the holding time should not be too long. The cooling time is 40-150 seconds.