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HDPE and ABS water absorption

Posted by Demented Chihuahua 
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Demented Chihuahua
HDPE and ABS water absorption
August 05, 2008 08:30PM
Andy D. did some nice work for a plastic holder and mentioned that there was some concern for water absorption in HDPE and ABS.

What exactly is the % water absorption for ABS and HDPE in a 24 hr period.

I found it here

[www.machinist-materials.com]

It is .3 for ABS and .03 for HDPE. Doesn't seem to be something we need to worry about for HDPE but ABS may be a concern...

Polypropylene has the best at .008.

Demented

Edited 1 time(s). Last edit at 08/05/2008 08:34PM by Demented Chihuahua.
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Joshua Merchant
Re: HDPE and ABS water absorption
August 05, 2008 09:55PM
You might want to look into coating with some sort of water-resistant material for objects that need it. This would be analogous to painting (priming?) wood, but it doesn't necessarily have to be a paint.

Just a thought.
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Forrest Higgs
Re: HDPE and ABS water absorption
August 05, 2008 10:18PM
Given that we really haven't been talking about printing solid objects the leakiness of our prints as to opposed to their tendency to absorb water might be quite an issue for some applications.
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Joshua Merchant
Re: HDPE and ABS water absorption
August 05, 2008 11:06PM
Forrest Higgs Wrote:
-------------------------------------------------------
> Given that we really haven't been talking about
> printing solid objects the leakiness of our prints
> as to opposed to their tendency to absorb water
> might be quite an issue for some applications.

That's just a software/firmware problem though, right? Wouldn't it be simple enough to modify the code to extrude solid layers on the surfaces of objects?
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Forrest Higgs
Re: HDPE and ABS water absorption
August 05, 2008 11:17PM
Joshua Merchant Wrote:
-------------------------------------------------------
>
> That's just a software/firmware problem though,
> right? Wouldn't it be simple enough to modify the
> code to extrude solid layers on the surfaces of
> objects?
>
Some things are very easy to say and quite hard to do. spinning smiley sticking its tongue out

Edited 1 time(s). Last edit at 08/06/2008 02:43AM by Forrest Higgs.
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Demented Chihuahua
Re: HDPE and ABS water absorption
August 06, 2008 12:49AM
Just posting in relation to conserns about water absorption of HDPE. I pretty much think its a non-issue.

Demented
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nophead
Re: HDPE and ABS water absorption
August 06, 2008 04:21AM
I don't think HDPE will ever have a problem with water absorbtion because it is so low but Vik Olliver reported problems with PLA, which has much higher absorbtion IIRC.

In the very limited tests I did with it I did not see any bubbles but then I work in a room that is warm and dry all year round. I expect in other parts of the world and in other types of building it may become a problem with PLA, and possibly ABS.

[www.hydraraptor.blogspot.com]
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Andromodon
Re: HDPE and ABS water absorption
August 07, 2008 12:04AM
Hey Demented,

My original posting about HDPE absorbing water was in error. I was vaguely reading something about some filament absorbing water and thought it was HDPE. I shouldn't have posted that without knowing for sure. Sorry about that. smiling smiley

~Andy
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Forrest Higgs
Re: HDPE and ABS water absorption
August 07, 2008 01:07AM
HDPE shouldn't be a problem. They make boats out of it. smiling bouncing smiley
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Demented Chihuahua
Re: HDPE and ABS water absorption
August 07, 2008 06:18AM
That's what I thought. Had to check anyway and let people know what I found. Good to have a data sheet like that though.

Demented
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