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Decolorizing plastics

This topic contains 1 reply, has 2 voices, and was last updated by  Nicolas 1 year ago.

paul grillet paulg

Decolorizing plastics

24/07/2019 at 05:13

Hi everyone!
Does anyone know a way to decolorize the plastics? The more eco-friendly the better! Do you know how big recycling plants do it? My guess is that’s very chemical heavy but if not maybe there are ways to make it work at small scale.


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In reply to: Decolorizing plastics

24/07/2019 at 07:28

Hello Paul !
(since you asked me in MP too, i’ll just copy my answer here so it can benefit everyone)

I don’t think there is any way to decolorize plastics. The color of a plastic is due to the pigmentation additives it has in it.

I work it out the other way round; as i color ”transparent” plastic through addition of colored plastics (of same type obviously). The pigments therefor blend in all the mass of molten plastic giving it the color !

That is one of the main issues of recycling industries, mixing all the colours will always give you a ”grey”-ish colour. Most of recycled products (PET bottles being an exception here) you will find are grey due to that point

Hope it helps you a bit ! Cheers Nick

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