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In lugnet.technic, Larry Pieniazek writes:
> In lugnet.technic, Jason S. Mantor writes:
> > The first one you cite is probably the right one for LEGO(R) Bricks.
> > They're molded, not extruded and I don't believe they are impact grade.
>
> They're clearly not extruded... that's the kind Plastruct(R) uses.
>
> But if they're just plain molded and not impact grade I am hoping they are
> from the higher end of the range. The low end mold temp (and I agree with
> Thomas Avery's speculations about what it means although my molding
> experience is with aluminium) of 109 scares me... it gets that hot in the
> south (or in attics) on a regular basis.
My guess would be 109C may be more likely - I'd be surprised if they could mold
it at 109F. I'm guessing my bad experience with the heater was well over 109F
(they were quite close to it), and they didn't "flow" anywhere near enough that
I'd expect they'd need for molding.
> HOWEVER, mold temp MAY mean the temperature you should heat the mold to for
> best results... I dunno. But I know that the aluminium targeted molds I saw
> were heated to 4-500 degrees Farenheit before the molt was introduced.
>
> Regardless, LEGO(r) will discolor if not actually deform well below boiling
> temps, I discolored some LEGO by putting it in a dishwasher.
And you can see the discolouration in bricks left outside for prolonged
periods, though this may also be related to light exposure. Just look closely
at the Legoland models 8?)
ROSCO
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IIRC, ABS is a thermoset plastic. The first time you melt it it's workable
at a relatively low temp and solidifies nicely, but heating it again won't
melt it, only deform it and finally burn it : (
-Xanthra47
Ross Crawford <rcrawford@csi.com> wrote in message
news:GsIupy.Kv9@lugnet.com...
> My guess would be 109C may be more likely - I'd be surprised if they could • mold
> it at 109F. I'm guessing my bad experience with the heater was well over • 109F
> (they were quite close to it), and they didn't "flow" anywhere near enough • that
> I'd expect they'd need for molding.
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In lugnet.technic, Jason S. Mantor writes:
> IIRC, ABS is a thermoset plastic. The first time you melt it it's workable
> at a relatively low temp and solidifies nicely, but heating it again won't
> melt it, only deform it and finally burn it : (
That explains it. And it smells pretty bad too - that's what alerted me when I
had my "accident".
ROSCO
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In lugnet.technic, Jason S. Mantor writes:
> IIRC, ABS is a thermoset plastic.
No, it's thermoplastic. But too much heat, or even localized hot spots, can
scorch it and make it unusable.
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