I'm designing some PTFE mounts. These mounts will be under a compressive load of 0.6 MPa and will be at a temperature of 150degC. Knowing that PTFE has a 'deflection temperature', the PTFE will compress more due to the elevated temperature.
My supplier of the material tells me -
"We don’t have any figures on compressive strength at 150°C, but we assume that even at this temperature with involved loads, there should not be any problems also with the unfilled grade of PTFE. According to values in literature, at 100°C, PTFE deforms of approx 1%, if we apply a constant load of 1.4 Mpa for 100 hours"
What I'm worried about is the '100 hrs'. In my design, the PTFE will be under load and at temperature for many 1000's of hrs. Will it continue to deflect until it is flat as a pancake?!
Thanks.
My supplier of the material tells me -
"We don’t have any figures on compressive strength at 150°C, but we assume that even at this temperature with involved loads, there should not be any problems also with the unfilled grade of PTFE. According to values in literature, at 100°C, PTFE deforms of approx 1%, if we apply a constant load of 1.4 Mpa for 100 hours"
What I'm worried about is the '100 hrs'. In my design, the PTFE will be under load and at temperature for many 1000's of hrs. Will it continue to deflect until it is flat as a pancake?!
Thanks.