Help selecting a plastic please
Name:
Gerardo Hi:
I'm looking to select a plastic and my criteria is very simple:
1.- It must be very tough but not brittle.
2.- It must be able to cope with temperatures below minus 50 degrees C without loss in its properties.
3.- The plastic must also lends itself to injection moulding.
The plan is to first machine my prototype from a strip of L600mm x W65mm x H15mm. Then after trials and test, go into production with injection moulding. I have had 30% Glass Filled Nylon suggested but the cost for my strip comes out at £32.00, which leads me to believe that my injection moulded part will be way too expensive. I'm looking at around £2.00, maybe £5.00 per part. Can somebody suggest a cheaper plastic? Given my criteria?
Regards and thanks
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Hi Gerardo.
Could you present more info, as it maybe because of the lack of it that it seems that you're confusing some concepts and figures.
First, there is not enough information to indicate you some plastics that MAY be suitable. What about other environmental considerations? Presence of water, UV..
Although the notions change, a brittle material is one which is not tough, i.e. cannot receive much energy without fracturing.
Is the profile a 65x15 mm thick bar? If it is, I doubt very much you could injection mould (with acceptable quality, of course)such a thick profile. 5 mm is already consider thick.
Many plastics behave adequately at -50 'C. But, in general their properties change. For example, is 2 times increase of Young's modulus OK when compared to the Young's modulus at room temperature?
What's the permissible variation?
How "very tough" is "very tough"? Have you worked out the energy it has to absorb/cope with?
How many parts do you intend to make?
Where did you get that 32 pounds figure?
Right, to help you further, I would suggest the following:
- found out how you can reduce the thickness (I-shape, C-shape beam, etc)
-estimate the permissible variations
- place more info regarding the conditions and purpose of the part
Perhaps, other members could be of further help.
MPS
Hello
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S.M.Plastic Industries