Subject:
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Re: Melting Point of ABS (Re: Strengthening Gears)
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Newsgroups:
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lugnet.technic
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Date:
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Wed, 6 Mar 2002 00:56:00 GMT
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Viewed:
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9898 times
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Thomas:
Lego uses primarily Bayer Novodur (and apparently to some
extent Bayer Lustran) for its bricks. The exact composition
of the Novodur is of course, like the recipie for Coke, is
top secret, but it is probably closest to Bayer Novodur P2M-V
A datasheet:
http://www.plastics.bayer.com/bayer/services/products/svl/sheet.html?vse=051559
59&item=Novodur%20P2M-V&hlit=0&hcase=0&hsec=0&pid=9
Well since you went to the trouble of looking up all this
information I thought that this data might be of interest
however, in terms of physical properties were probably
splitting hairs
--Jim
In lugnet.technic, Thomas Avery writes:
> In lugnet.technic, David Schilling writes:
> > A quick search on Google shows that ABS (Acrylonitrile-butadiene-styrene)
> > has a melting point of 103-128°C. Since water boils at 100°C, I don't have
> > any doubt that you would see some deformation by that point.
>
> There are different grades of ABS, each having different mechanical
> properties. I found an extensive resource on materials at: • http://www.matweb.com
>
> The ABS property data can be found here:
> http://www.matweb.com/abspolymer.htm
>
> I picked 3 grades of ABS that seemed likely to be the type(s) that Lego
> uses, but I'm not sure:
>
> ABS, Molded
> http://www.matweb.com/SpecificMaterial.asp?bassnum=O1100
> max service temp in air: 140 - 223 F
> mold temperature: 109 - 149 F
> processing temperature: 399 - 500 F
>
> ABS, Impact Grade, Molded
> http://www.matweb.com/SpecificMaterial.asp?bassnum=O1103
> max service temp in air: 167 - 365 F
> mold temperature: 111 - 149 F
> processing temperature: 410 - 487 F
>
> ABS, Extruded
> http://www.matweb.com/SpecificMaterial.asp?bassnum=O1106
> max service temp in air: 140 - 212 F
> mold temperature: 136 F
> processing temperature: 392 - 486 F
>
> I'm not sure what the different terms mean, exactly. I can tell you all
> about steel, but nothing about plastic :-)
>
> What I think they indicate (please, someone correct me if I'm wrong) is that
> the actual melting point is difficult to pick because of the gradual
> softening of the material. I think the actual melting point, or rather the
> point at which the material experiences permanent deformation, is dependant
> on the applied stresses.
>
> Obviously, there will be a point at which the material deforms under its own
> weight, and that is perhaps the classic definition of melting. There will
> also be a point at which the material can be safely molded by applied forces
> without fracturing the material. This point is perhaps the "mold
> temperature". The mold temperature will be much less than the "classic
> melting point".
>
> So, what use is this information? Will Lego pieces melt or not in boiling • water?
>
> The answer is: NO, they will not melt. However, they WILL permanently deform!
>
> Boiling water (212 F) is much higher than the mold temperatures given above.
> Therefore it is possible that the self weight of the material, and also
> handling the material in and out of the water, will apply enough stress to
> permanently deform (or "remold" if you like) the bricks.
>
> The experiences that others have stated in the thread reinforces this.
>
> TJ
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Message is in Reply To:
 | | Melting Point of ABS (Re: Strengthening Gears)
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| (...) There are different grades of ABS, each having different mechanical properties. I found an extensive resource on materials at: (URL) ABS property data can be found here: (URL) picked 3 grades of ABS that seemed likely to be the type(s) that (...) (23 years ago, 5-Mar-02, to lugnet.technic)
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