RE: [rp-ml] SLS Polyamide and effects of UV exposure

From: Scott Tilton (
Date: Thu Jun 16 2005 - 23:56:05 EEST

I've got a very informal experiment going on outside right now . .. but
I can tell you what I've observed from direct experience:


I've had SLS PA parts in a drawer for over 4 years now. They are MUCH
more white than the sample parts that have been out in the open.


For that matter .. there's another couple of parts that have been on
display for a few years . . . think of little houses and hotels on the
board in Monopoly.

If I pull the little SLS pieces off the SLS board . . . the board is
much more white where the pieces have been masking it.


So personally, I attribute a lot of the yellowing to exposure to light.


Thanks for your reply.


Scott Tilton



From: Ricardo Calumby []
Sent: Wednesday, June 15, 2005 11:40 AM
To: Scott Tilton
Subject: Re: [rp-ml] SLS Polyamide and effects of UV exposure


Dear Scott,


I agree with your comments. I have some SLS Polyamide parts that became
yellowish with time, even without been exposured to direct sun light. I
really do not know if these parts have its mechanical properties


But, as the SLS parts are porous, maybe this yellowish behaviour could
be due to dirty impregnation on the part surface.


Ricardo Calumby.

Scott Tilton <> escreveu:

        Hi everyone.


        Besides discoloring, what else happens to SLS Polyamide when it
has long term UV exposure. (as in, outdoor sunlight)


        If the mechanical properties are affected, can anyone point me
to a report or some data that explains it in better detail.


        Thanks in advance.



        Scott Tilton


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