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In lugnet.lego, Rob Antonishen wrote:
> On 1/3/07, Reinhard Ben Beneke wrote:
> > So I would guess that the "mismoulded" bricks, which you have shown, are from
> > that era. Can you tell, if those bricks are ABS or CA? You will hear the
> > difference when you drop them on a hard table surface or on floor tiles.
>
>
> That's an experiment that I will have to try when my collection is
> closer at hand :)
>
> -Rob A>
I would be interested in the result, Rob.
Just for your information:
CA has a much higher material damping coefficient in comparison to ABS. So CA
will make less noise and sound very dump when it hits the ground.
Especially for the classical 2x2-windows this is the easiest way to tell. For
other bricks it often depends how they hit the ground (with corner, top or
sidewall). And I found it is helpful for black bricks as well. While red and
yellow CA looks somewhat shiny and transparent, black CA looks nearly identical
to black ABS.
So the dropping sound test is the easiest way to tell the difference. (Of course
the modified wall thicknesses etc. have an influence on the sound as well).
Happy testing!
Ben
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