Pagoda SL Group

W113 Pagoda SL Group => General Discussion => Topic started by: Shvegel on December 12, 2020, 18:11:32

Title: How to restore plastic parts.
Post by: Shvegel on December 12, 2020, 18:11:32

Thought I would pass this on.

Title: Re: How to restore plastic parts.
Post by: Pawel66 on December 12, 2020, 19:57:40

This is after a month of my fight to make the brake fluid reservoir white again...

Title: Re: How to restore plastic parts.
Post by: Peter on December 12, 2020, 21:04:52

"Thought I would pass this on......."


Thanks, I recognize this, brilliant.  ;D

^Peter

Title: Re: How to restore plastic parts.
Post by: ejboyd5 on December 13, 2020, 00:04:15

Not confusing at all. Shvegel is simply confirming the fact that once the container has changed color it's not going back to white.

Title: Re: How to restore plastic parts.
Post by: wwheeler on December 13, 2020, 01:10:00

Plastic is surprising porous and absorbs color from liquids very easily. Once it is absorbed, it is not coming back out. Plastic bottles of swimming pool acid will emit a very slight acidic fume over time. Place a gallon near steel parts and you will see within a few months that the steel will have starting rusting. Highly evaporative solvents will also creep very slowly through plastic bottles. That is why most come is steel containers, not plastic.

Title: Re: How to restore plastic parts.
Post by: MikeSimon on December 13, 2020, 13:24:08

Not only liquid, but light will discolor plastic also.

Title: Re: How to restore plastic parts.
Post by: RobSirg on December 14, 2020, 00:04:44

Great Post ;D - my experience exactly

Title: Re: How to restore plastic parts.
Post by: Tyler S on December 14, 2020, 01:23:06

Quote from: MikeSimon on December 13, 2020, 13:24:08

Not only liquid, but light will discolor plastic also.

Yes. The bromine (fire retardant) in plastics reacts with UV. You can use commercial hair bleaching peroxide cream to change it back to an original whiter color. Though I would only attempt it on cosmetic items as the plastic is already a brittle 50 years old.

Title: Re: How to restore plastic parts.
Post by: Pawel66 on December 14, 2020, 07:19:41

Tyler, I tried it actually. No effect. Any specific way you could share to make it work? I tried it on brakes fuid reservoir.

Title: Re: How to restore plastic parts.
Post by: WRe on December 14, 2020, 08:20:22

https://www.sl113.org/forums/index.php?topic=32030.msg232418#msg232418

Title: Re: How to restore plastic parts.
Post by: Pawel66 on December 14, 2020, 23:51:13

I did that. It did not work.

You say 10% solution and UV? Maybe I missed UV...

Could you describe how exactly you did that? Apparently I missed something...

Title: Re: How to restore plastic parts.
Post by: WRe on December 15, 2020, 17:37:49

Hi Pawel,
Peter from pagodentreff.de put it all together in a lockable glas and left it sometimes turning around for some weeks in the sun.
...Wolfgang

Title: Re: How to restore plastic parts.
Post by: Pawel66 on December 15, 2020, 19:23:59

I see, thank you.

Do you know if he used just the 10% H2O2 as you buy it in bigger bottle, or he further diluted it?

Title: Re: How to restore plastic parts.
Post by: GM on December 15, 2020, 21:23:47

Full strength, undiluted. But you need the "potent" peroxide from a beauty shop, apparently.
I have yet to try this but there is also this - https://www.youtube.com/watch?v=JqCN7VHMtfQ (https://www.youtube.com/watch?v=JqCN7VHMtfQ) - which I am curious to try

Title: Re: How to restore plastic parts.
Post by: Pawel66 on December 15, 2020, 21:37:48

Thanks. That is where I got mine. Missed UV maybe...