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Afternoon Everyone,
I have a general question about Tg (Glass Transition Temperature) and using it as a design criteria.
I come from the metals world and I tend to specific/use metals in temperatures where they will not be brittle. Metals, like plastics, tend to have a temperature above which they are ductile and below which they are brittle. Although every application is different, generally as a rule you want to be in the ductile state and you would design your metal to ensure this.
Are there any general rules regarding using plastics in environments below their Tg? Is it ok to do so, or is everyone typically striving to be above the Tg temperature during service? I recently looked up the Tg of Nylon, and it seems to be 40C-50C. However we often use Nylon at room temperature and thus we are using it in its brittle state. Am I missing something? Or are most Nylons outfitted with a tonne of plasteciser which brings down its Tg to below room temperature making Nylon components usable at room temperatures?
Any insights would be helpful,
Thanks!
I have a general question about Tg (Glass Transition Temperature) and using it as a design criteria.
I come from the metals world and I tend to specific/use metals in temperatures where they will not be brittle. Metals, like plastics, tend to have a temperature above which they are ductile and below which they are brittle. Although every application is different, generally as a rule you want to be in the ductile state and you would design your metal to ensure this.
Are there any general rules regarding using plastics in environments below their Tg? Is it ok to do so, or is everyone typically striving to be above the Tg temperature during service? I recently looked up the Tg of Nylon, and it seems to be 40C-50C. However we often use Nylon at room temperature and thus we are using it in its brittle state. Am I missing something? Or are most Nylons outfitted with a tonne of plasteciser which brings down its Tg to below room temperature making Nylon components usable at room temperatures?
Any insights would be helpful,
Thanks!