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Old 11-18-2017, 06:43 PM   #1 (permalink)
 
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Default Question about plastics

I can't remember my plastic acronyms, Is there a plastic that resin (any resin) won't stick to ? I know resin usually won't stick to a very smooth surface like glass, but is there are plastic that Resin won't adhere to at all?
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Old 11-18-2017, 07:21 PM   #2 (permalink)
 
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HDPE is the only one that I know of.
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Old 11-18-2017, 08:04 PM   #3 (permalink)
 
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I think Polypropylene qualifies. Most trash cans are made of it. It has to be flame treated before printing inks will stick to it, including epoxy.
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Old 11-18-2017, 08:50 PM   #4 (permalink)
 
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HDPE is Polypropylene so your probably right!
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Old 11-18-2017, 08:55 PM   #5 (permalink)
 
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Excuse me please, High Density Poly Ethylene?
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Old 11-18-2017, 09:06 PM   #6 (permalink)
 
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Not sure what application you are going for, but I use silicone a lot. No, not a plastic, but still useful

The kitchen cutting mats (upstairs, left side, top right drawer... when Wifey is not looking) are excellent to glue segmented stuff on with wood glue, epoxy, CA. Bend the mat it pops off, bend it some more all the glue pops off.

Makes excellent casting molds also (i.e., silicone sets of flexible measuring cups).
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Old 11-18-2017, 09:09 PM   #7 (permalink)
 
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Not many things stick to PTFE (polytetrafluoroethylene). Perhaps better known under it's brand name, "Teflon".
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Old 11-18-2017, 09:27 PM   #8 (permalink)
 
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Acetal (Delrin) maybe?

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Old 11-18-2017, 09:30 PM   #9 (permalink)
 
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Quote:
Originally Posted by bmachin View Post
Acetal (Delrin) maybe?
I wondered about that, but remember seeing a kitless pen that used acetal as finials on the barrel and cap. (They might have been threaded, of course.)
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Old 11-18-2017, 09:38 PM   #10 (permalink)
 
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Thought about Silicone, but need something non flexible.
McMaster has good pricing, Proto-type time :)
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