Plastic ring: ID vs. temperature
Plastic ring: ID vs. temperature
(OP)
I have a plastic ring with a certain ID value at room temperature.
How can I estimate ID at -65 deg C? at 125 deg C?
Do I need to run FEA, or calculations, please?
Thanks.
How can I estimate ID at -65 deg C? at 125 deg C?
Do I need to run FEA, or calculations, please?
Thanks.





RE: Plastic ring: ID vs. temperature
The co-efficient of thermal expansion will change over that temperature range. If the currently undisclosed plastic is fibre reinforced, the co-efficient of thermal expansion will vary considerably according to direction of flow when moulded.
Regards
Pat
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RE: Plastic ring: ID vs. temperature
Thank you for explanation.
The plastic is ULTEM 1000, and I was lucky to get a single value of CTE.
I am currently using a simple formula, assuming it expands in both directions along the radius.
I wonder whether there are better ways to estimate ID.
RE: Plastic ring: ID vs. temperature
RE: Plastic ring: ID vs. temperature
The biggest changes will be as it passes through second order transition points such as GTT.
I do not personally have data on Ultem 1000. Ask Sabic for more detailed data.
Regards
Pat
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RE: Plastic ring: ID vs. temperature
Sorry, I dont know how to get to Sabic.
Thank you.
RE: Plastic ring: ID vs. temperature
Regards
Pat
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RE: Plastic ring: ID vs. temperature
RE: Plastic ring: ID vs. temperature
That's not a good assumption to make.
thread391-246558: Thermal expansion question ?
RE: Plastic ring: ID vs. temperature
http://lmgtfy.com/?q=Sabic
And yes MintJulep, I saw that and was curious if he meant what it sounded like.
-tg
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RE: Plastic ring: ID vs. temperature
This gives along and across the flow over a fairly wide temperature range, but not so wide as you require.
YOU will need to contact Sabic directly if you hope to get more detailed information
Regards
Pat
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RE: Plastic ring: ID vs. temperature
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RE: Plastic ring: ID vs. temperature
Thank you for this link!