 | | 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 (...) (22 years ago, 5-Mar-02, to lugnet.technic)
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| | Re: Melting Point of ABS (Re: Strengthening Gears)
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(...) 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 (...) (22 years ago, 5-Mar-02, to lugnet.technic)
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| | Re: Melting Point of ABS (Re: Strengthening Gears)
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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. Thomas Avery <thomas.avery@intec-hou.com> wrote in message news:GsI76v.GED@lugnet.com... (...) have (...) (...) (22 years ago, 5-Mar-02, to lugnet.technic)
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| | Re: Melting Point of ABS (Re: Strengthening Gears)
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(...) I measured the temp in my attic last summer and it reached 115 F. Needless to say I don't keep much up there and definitely not my Lego collection! ROSCO had a bad "melting" experience: (URL) think this was caused by prolonged exposure to (...) (22 years ago, 5-Mar-02, to lugnet.technic)
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| | Re: Melting Point of ABS (Re: Strengthening Gears)
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(...) IIRC, I thought it was from the back shelf of a car... cars with no windows opened can easily get to 145 or even hotter. (hence the warnings about not leaving dogs or ferrets or cats or whatever locked in cars on sunny days, it will kill them) (22 years ago, 5-Mar-02, to lugnet.technic)
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| | Re: Melting Point of ABS (Re: Strengthening Gears)
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If you would just put your bricks in the kitchen oven you would make rapid progress with this question. Better yet, obtain a laboratory hot plate with fine temperature control and put a brick between two slides with a weight on top. Do this at (...) (22 years ago, 5-Mar-02, to lugnet.technic)
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| | Re: Melting Point of ABS (Re: Strengthening Gears)
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(...) I am in total agreement with this, including the 'you' (as long as it's not 'me'... advancement of science is fine but I ain't putting my bricks in no oven thank you) (22 years ago, 5-Mar-02, to lugnet.technic)
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| | Re: Melting Point of ABS (Re: Strengthening Gears)
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(...) Yes, I can see how this would help the progress of scientific knowledge, but realize that technic pieces are hard to come by in the first place these days.. you cannot walk into your local toystore and pick up a supercar... that I'll take the (...) (22 years ago, 5-Mar-02, to lugnet.technic)
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| | Re: Melting Point of ABS (Re: Strengthening Gears)
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The "service" temperature is the limit at what you should operate it at. The "mold" temperature is how LOW the mold has to be cooled to get a good shot. The "processing" temperature is the temperature the plastic has to be when it enters the mold. (...) (22 years ago, 5-Mar-02, to lugnet.technic)
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| | Re: Melting Point of ABS (Re: Strengthening Gears)
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(...) That reminds me of a picture I just took in December at Legoland - the Grand Central Station in Miniland had an amazing bit of damage due to sunlight! Check it out at (URL) (big file - sorry) - look in the bottom right corner of the 'window' (...) (22 years ago, 5-Mar-02, to lugnet.technic)
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| | Re: Melting Point of ABS (Re: Strengthening Gears)
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(...) Not so prolonged exposure to gas heater! (URL) (22 years ago, 5-Mar-02, to lugnet.technic)
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| | Re: Melting Point of ABS (Re: Strengthening Gears)
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(...) 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 (...) (22 years ago, 5-Mar-02, to lugnet.technic)
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| | Re: Melting Point of ABS (Re: Strengthening Gears)
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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 (...) (22 years ago, 6-Mar-02, to lugnet.technic)
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| | Re: Melting Point of ABS (Re: Strengthening Gears)
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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 (...) (22 years ago, 6-Mar-02, to lugnet.technic)
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| | Re: Melting Point of ABS (Re: Strengthening Gears)
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(...) That explains it. And it smells pretty bad too - that's what alerted me when I had my "accident". ROSCO (22 years ago, 6-Mar-02, to lugnet.technic)
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| | Re: Melting Point of ABS (Re: Strengthening Gears)
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(...) No, it's thermoplastic. But too much heat, or even localized hot spots, can scorch it and make it unusable. (22 years ago, 6-Mar-02, to lugnet.technic)
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