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Chemistry Forums for Students => Organic Chemistry Forum => Topic started by: gamemaniaco on October 11, 2020, 12:52:03 PM

Title: Question plastic and salt
Post by: gamemaniaco on October 11, 2020, 12:52:03 PM
If in any piece of plastic there is some salt deposited in the plastic, will that salt dry out the plastic and damage it, making the plastic fragile?
Title: Re: Question plastic and salt
Post by: chenbeier on October 11, 2020, 01:03:47 PM
I would say Yes, but how a salt should be deposited into the plastic.
Do you know how polymers are produced?
Title: Re: Question plastic and salt
Post by: gamemaniaco on October 11, 2020, 01:40:52 PM
I know that UV light and heat dry out the plastic but if salt particles are deposited on the plastic I don't know if the salt dries out the plastic
Title: Re: Question plastic and salt
Post by: chenbeier on October 11, 2020, 01:55:06 PM
Again salt would also harm the plastic, but the question is how should it get into it.
Title: Re: Question plastic and salt
Post by: gamemaniaco on October 11, 2020, 02:06:40 PM
a piece of Tazo plastic usually has some trace of salt, if I store this piece with the salt trace will the salt dry out and make the plastic brittle?

(https://i.pinimg.com/originals/e0/7e/5e/e07e5e98a7149d1de5b87e5ef82bb059.jpg)
Title: Re: Question plastic and salt
Post by: chenbeier on October 11, 2020, 02:46:55 PM
These are DVD, they are made by Polycarbonat. Where does the salt comes from. If some is present, they will get brittle.
Title: Re: Question plastic and salt
Post by: Borek on October 11, 2020, 02:51:34 PM
These are not DVDs.

My bet is salt is not "in" but "on". Just cleaning them with a wet rag should be OK.
Title: Re: Question plastic and salt
Post by: gamemaniaco on October 11, 2020, 02:56:35 PM
No, the salt is not inside the plastic but superficial, if the salt remains on the surface it dries out that plastic equal to sunlight and heat, salt dry out and crack this plastic?
Title: Re: Question plastic and salt
Post by: chenbeier on October 11, 2020, 03:37:55 PM
These are not DVDs.

My bet is salt is not "in" but "on". Just cleaning them with a wet rag should be OK.

Instead only to say these are not DVD, you should also tell what it is instead.

Title: Re: Question plastic and salt
Post by: Borek on October 11, 2020, 04:09:56 PM
Instead only to say these are not DVD, you should also tell what it is instead.

OP already wrote what these are. Even if you have not ever heard about https://en.wikipedia.org/wiki/Tazos it is not that difficult to spot that they miss holes in the middle.
Title: Re: Question plastic and salt
Post by: Borek on October 11, 2020, 04:13:38 PM
No, the salt is not inside the plastic but superficial, if the salt remains on the surface it dries out that plastic equal to sunlight and heat, salt dry out and crack this plastic?

Most plastics are resistant enough, but if you have some more valuable pieces just clean them out to be on the safe side.
Title: Re: Question plastic and salt
Post by: gamemaniaco on October 11, 2020, 06:07:10 PM

I clean the tazos smas always leave a little salt deposited on the surface and this salt will cause damage to the plastic and dry out the plastic making it brittle?
Title: Re: Question plastic and salt
Post by: chenbeier on October 12, 2020, 01:35:38 AM
Instead only to say these are not DVD, you should also tell what it is instead.

OP already wrote what these are. Even if you have not ever heard about https://en.wikipedia.org/wiki/Tazos it is not that difficult to spot that they miss holes in the middle.

My country is not on the list so I don't know them sorry. Ok some has no hole, but do they need it? A CD is not a vinyl record. But never mind.

And for the topic salt will not harm it, if it is outside on the surface.
Title: Re: Question plastic and salt
Post by: gamemaniaco on October 12, 2020, 04:29:29 PM
plastics undergoes any reaction when salt is on the surface?
Title: Re: Question plastic and salt
Post by: wildfyr on October 13, 2020, 10:38:07 AM
Use distilled water to clean and it won't leave a residue. Small amounts of residual salt from tap water are harmless to such plastics.
Title: Re: Question plastic and salt
Post by: gamemaniaco on October 14, 2020, 09:02:31 AM

If the salt is not cleaned from the surface of the plastic, does it dry out the plastic?
Title: Re: Question plastic and salt
Post by: Borek on October 14, 2020, 09:38:15 AM
If the salt is not cleaned from the surface of the plastic, does it dry out the plastic?

No, it doesn't "dry out" the plastic, whatever it is intended to mean. It can probably speed up the degradation, especially in a humid air. Still, it depends on what kind of a plastic is used, there are many and they have quite different properties.
Title: Re: Question plastic and salt
Post by: gamemaniaco on October 14, 2020, 12:13:28 PM
I read that UV light and heat dry out and weaken plastics so I thought, does salt deposited on the plastics surface cause this same problem?

I read that UV and heat modify the chemistry of plastics but the salt I don't know
Title: Re: Question plastic and salt
Post by: Corribus on October 15, 2020, 11:35:25 AM
Generally, no, salts have no effect on common polymers used in everyday products.

But for the sake of your knowledge, you cannot speak of "plastics" as a monolith... or salts for that matter. There are exceptions to everything, and specific information is needed to make specific conclusions and predictions. Without knowing what your products are made from, or what salts we are dealing with, a certain answer is not possible.

Title: Re: Question plastic and salt
Post by: gamemaniaco on October 15, 2020, 02:48:08 PM
I do not know what type of plastic is used in the manufacture of Tazos, I researched but did not find

(https://tazoselmachips.com.br/img/tazos.png)

(https://conteudo.imguol.com.br/c/bol/fotos/bb/2017/06/22/jan1997---logo-no-inicio-do-ano-comecou-a-febre-da-tazo-mania-a-promocao-dos-pequenos-discos-colecionaveis-que-vinham-nos-salgadinhos-da-elma-chips-1498102568120_956x506.jpg)

Title: Re: Question plastic and salt
Post by: gamemaniaco on October 17, 2020, 09:05:38 PM
???
Title: Re: Question plastic and salt
Post by: Corribus on October 19, 2020, 12:05:34 PM
gamemaniaco, I'm not sure what else you expect from us. We've told you that most likely salt will not damage polymers used in commercial products, but without knowing the exact polymer or the salt it can't be stated with certainty. We can't invent information we don't have.
Title: Re: Question plastic and salt
Post by: gamemaniaco on October 24, 2020, 12:51:22 PM
If in the air there is any Sodium hypochlorite or muriatic acid vapor will this vapor settle in plastic pieces and dry out plastic piece?
Title: Re: Question plastic and salt
Post by: Borek on October 24, 2020, 06:48:34 PM
That's enough. You registered several times at this forum, each time asking similar questions and NEVER listening to answers.

See for example https://www.chemicalforums.com/index.php?topic=101982

Topic locked.