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#4563461 - 11/03/17 10:37 PM Ever wonder how RainX works?
Scienceman Offline


Registered: 10/04/09
Posts: 2859
Loc: Earth
Glass is mostly silicone dioxide, which means the molecules are overall polar (unequal distribution of charge as a result of the atomic structure). This polar surface can be overcome by doing some organic chemistry, called silanization. Adding certain compounds, like hexamethyldisilazine adds non-polar group to the glass surface.

Remember, water is a polar molecule. Like attracts like. By adding a non-polar functional group to the glass structure, the water beads and is repelled.



Image: Glass (polar)+ RainX (adds CH3 non polar groups)-> Beading water (repelled by non polar groups)!


Edited by Scienceman (11/03/17 10:46 PM)

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#4563471 - 11/03/17 10:45 PM Re: Ever wonder how RainX works? [Re: Scienceman]
FordBroncoVWJeta Offline


Registered: 04/16/16
Posts: 719
Loc: KS
I feel like i'm back in math class. Even though you explained everything, I feel more stupid than when you began.
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#4563472 - 11/03/17 10:45 PM Re: Ever wonder how RainX works? [Re: Scienceman]
Artem Offline


Registered: 10/30/10
Posts: 5086
Loc: Florida
Interesting. Never looked at the science behind Rain-X. I use it on my Semi Truck every time rain is forecast along my route. I end up not using my windshield wipers AT ALL during light showers because the water flies off and the beading action makes it see thru. Idk how people drive without it.
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#4563474 - 11/03/17 10:47 PM Re: Ever wonder how RainX works? [Re: FordBroncoVWJeta]
Scienceman Offline


Registered: 10/04/09
Posts: 2859
Loc: Earth
Originally Posted By: FordBroncoVWJeta
I feel like i'm back in math class. Even though you explained everything, I feel more stupid than when you began.


Never to old to learn!


Edited by Scienceman (11/03/17 10:47 PM)

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#4563524 - 11/04/17 12:34 AM Re: Ever wonder how RainX works? [Re: Scienceman]
Linctex Offline


Registered: 12/31/16
Posts: 5718
Loc: Waco, TX
Originally Posted By: Scienceman
Originally Posted By: FordBroncoVWJeta
I feel like i'm back in math class. Even though you explained everything, I feel more stupid than when you began.

Never to old to learn!


Agreed.

Even though chemistry doesn't come naturally,
I understand how polars work and I get the Gist of it.

Thanks for posting!
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#4563539 - 11/04/17 01:09 AM Re: Ever wonder how RainX works? [Re: Scienceman]
OneEyeJack Offline


Registered: 09/14/10
Posts: 7402
Loc: S California
You've just ruined it. I thought it was magic.

They're going to try and sell that stuff in Southern California but they're still waiting for it to rain hard enough to get windshields wet. Their expectations are high. Last year it rained so hard once that several puddles formed. Maybe they'll try again next year.

They were going to push the idea of keeping the windshield clear of snow but they couldn't find anyone that had ever driven in the snow.

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#4563555 - 11/04/17 03:06 AM Re: Ever wonder how RainX works? [Re: OneEyeJack]
4WD Offline


Registered: 09/21/10
Posts: 6027
Loc: Texas/International
Magic is what it takes to get that Slime-X off the glass
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#4563591 - 11/04/17 05:39 AM Re: Ever wonder how RainX works? [Re: FordBroncoVWJeta]
d00df00d Offline


Registered: 10/20/05
Posts: 11126
Loc: PA
Originally Posted By: FordBroncoVWJeta
I feel like i'm back in math class. Even though you explained everything, I feel more stupid than when you began.

Water is made of polar molecules. So is glass. Polar things are attracted to each other. So, when water lands on your glass windshield, it more or less stays there until it's wiped off.

RainX is made of molecules that have a polar side and a non-polar side. When you put it on your windshield, the polar sides of the molecules stick to your glass -- because, again, polar things are attracted to each other. But that means the non-polar sides end up facing outward. So, when water lands on them, it lands on the non-polar side. There's no attraction there, and the water just slides off.
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#4563615 - 11/04/17 06:23 AM Re: Ever wonder how RainX works? [Re: Scienceman]
Shannow Offline


Registered: 12/12/02
Posts: 39042
Loc: 'Stralia
So per the post and the pics, RainX is actually a chemical treatment of the glass, rather than a coating.

I thought that with all the fapping around trying to buff it out that it was a coating...then thought that the washer additive wasn't useful for the same reason.

Thanks for the post, that's pretty cool...I've always been a user of the product, as it works.

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#4563618 - 11/04/17 06:40 AM Re: Ever wonder how RainX works? [Re: Shannow]
d00df00d Offline


Registered: 10/20/05
Posts: 11126
Loc: PA
Originally Posted By: Shannow
So per the post and the pics, RainX is actually a chemical treatment of the glass, rather than a coating.

I thought that with all the fapping around trying to buff it out that it was a coating...then thought that the washer additive wasn't useful for the same reason.

Thanks for the post, that's pretty cool...I've always been a user of the product, as it works.

Oh wow -- you're right.

I retract my previous post. Hadn't looked at the diagram closely. Epic derp.
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#4563653 - 11/04/17 08:16 AM Re: Ever wonder how RainX works? [Re: Scienceman]
Papa Bear Offline


Registered: 08/11/05
Posts: 6999
Loc: Leamington, ON, Canada ..... r...
Originally Posted By: Scienceman
Originally Posted By: FordBroncoVWJeta
I feel like i'm back in math class. Even though you explained everything, I feel more stupid than when you began.


Never to old to learn!


"TOO" old to learn wink2
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https://www.hogsforhospice.com/

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#4563680 - 11/04/17 09:02 AM Re: Ever wonder how RainX works? [Re: Papa Bear]
Scienceman Offline


Registered: 10/04/09
Posts: 2859
Loc: Earth
Originally Posted By: Papa Bear
Originally Posted By: Scienceman
Originally Posted By: FordBroncoVWJeta
I feel like i'm back in math class. Even though you explained everything, I feel more stupid than when you began.


Never to old to learn!


"TOO" old to learn wink2


You caught me! Never said I loved English!

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#4563711 - 11/04/17 09:35 AM Re: Ever wonder how RainX works? [Re: Scienceman]
SHOZ Online   shocked


Registered: 06/28/03
Posts: 5603
Loc: Illinois
Just did both cars yesterday prior to winter driving. I've found it much easier to do when the temperature is around 50F out.

Thanks for the explanation.
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#4563734 - 11/04/17 09:53 AM Re: Ever wonder how RainX works? [Re: Scienceman]
Virtus_Probi Offline


Registered: 06/25/15
Posts: 3805
Loc: New England
Where did the nitrogen go??
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#4563743 - 11/04/17 10:06 AM Re: Ever wonder how RainX works? [Re: Scienceman]
Al Offline


Registered: 06/08/02
Posts: 17957
Loc: Elizabethtown, Pa
Thanks
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