Subject:
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Re: Cleaning old Lego
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Newsgroups:
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lugnet.general
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Date:
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Mon, 26 Jan 2004 05:03:00 GMT
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Viewed:
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2134 times
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In lugnet.general, David Laswell wrote:
> In lugnet.general, Jindrich Kubec wrote:
> > Has anybody tried to bleach yellowed parts?
>
> Bleach is great for dirt, but yellowing of ABS is caused by a chemical breakdown
> of the plastic molecules, not surface dirt. ABS is not UV-stable, and natural
> ABS (which has a milky beige color) will turn brown and brittle/powdery over
> time. Some coloring agents will lend a touch of UV-stability to the ABS (black
> ABS, which is colored with carbon, is 100% UV-stable), but white doesn't appear
> to be one of them.
Lego has produced different shades of white and I always wondered if they were
experimenting with additives. Some of the white bricks are just milkier, less
brilliant, out of the box.
One commercial product which absorbs UV (mainly for plastic film?) is Cyasorb
UV-1164, described as "light yellow" "with minimal color contribution". Made me
wonder if there IS an ideal way to protect white plastic without making it less
white.
-Erik
supposed to be doing PDE homework
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Message has 1 Reply:
 | | Re: Cleaning old Lego
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| (...) It's entirely possible. I've noticed that there are two distinct versions of the old classic brown when produced in ABS (just the harder plastic used for 2x4 bricks, not the softer plastics), but they only really show up under blacklight. (...) (20 years ago, 26-Jan-04, to lugnet.general)
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Message is in Reply To:
| | Re: Cleaning old Lego
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| (...) Bleach is great for dirt, but yellowing of ABS is caused by a chemical breakdown of the plastic molecules, not surface dirt. ABS is not UV-stable, and natural ABS (which has a milky beige color) will turn brown and brittle/powdery over time. (...) (20 years ago, 24-Jan-04, to lugnet.general)
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