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Ever wonder how RainX works? #4563461
11/03/17 10:37 PM
11/03/17 10:37 PM
Joined: Oct 2009
Posts: 2,859
Earth
Scienceman Offline OP
Scienceman  Offline OP

Joined: Oct 2009
Posts: 2,859
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)!

Last edited by Scienceman; 11/03/17 10:46 PM.
Re: Ever wonder how RainX works? [Re: Scienceman] #4563471
11/03/17 10:45 PM
11/03/17 10:45 PM
Joined: Apr 2016
Posts: 1,155
KS
FordBroncoVWJeta Online content
FordBroncoVWJeta  Online Content

Joined: Apr 2016
Posts: 1,155
KS
I feel like i'm back in math class. Even though you explained everything, I feel more stupid than when you began.


2017 Volkswagen Jetta 1.4T - 2015 Honda CRV 2.4 - 2012 Volkswagen Jetta 2.0 - 2007 Chevy Trailblazer 4.2 - 2001 Pontiac Sunfire 2.2
Re: Ever wonder how RainX works? [Re: Scienceman] #4563472
11/03/17 10:45 PM
11/03/17 10:45 PM
Joined: Oct 2010
Posts: 5,472
Florida
Artem Offline
Artem  Offline

Joined: Oct 2010
Posts: 5,472
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.


2014 Mazda 3 Hatch 2.0L & 6spd - Idemitsu 0w20 Synthetic @ $0.75 a quart. (thanks Advance Auto Parts for the awesome deal)
Re: Ever wonder how RainX works? [Re: FordBroncoVWJeta] #4563474
11/03/17 10:47 PM
11/03/17 10:47 PM
Joined: Oct 2009
Posts: 2,859
Earth
Scienceman Offline OP
Scienceman  Offline OP

Joined: Oct 2009
Posts: 2,859
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!

Last edited by Scienceman; 11/03/17 10:47 PM.
Re: Ever wonder how RainX works? [Re: Scienceman] #4563524
11/04/17 12:34 AM
11/04/17 12:34 AM
Joined: Dec 2016
Posts: 8,011
Waco, TX
Linctex Offline
Linctex  Offline

Joined: Dec 2016
Posts: 8,011
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!


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Ever wonder how RainX works? [Re: Scienceman] #4563539
11/04/17 01:09 AM
11/04/17 01:09 AM
Joined: Sep 2010
Posts: 7,485
S California
OneEyeJack Offline
OneEyeJack  Offline

Joined: Sep 2010
Posts: 7,485
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.

Re: Ever wonder how RainX works? [Re: OneEyeJack] #4563555
11/04/17 03:06 AM
11/04/17 03:06 AM
Joined: Sep 2010
Posts: 8,180
Texas
4WD Offline
4WD  Offline

Joined: Sep 2010
Posts: 8,180
Texas
Magic is what it takes to get that Slime-X off the glass

Re: Ever wonder how RainX works? [Re: FordBroncoVWJeta] #4563591
11/04/17 05:39 AM
11/04/17 05:39 AM
Joined: Oct 2005
Posts: 11,551
PA
d00df00d Online content
d00df00d  Online Content

Joined: Oct 2005
Posts: 11,551
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.


2008 BMW M3 Sedan 6MT
Re: Ever wonder how RainX works? [Re: Scienceman] #4563615
11/04/17 06:23 AM
11/04/17 06:23 AM
Joined: Dec 2002
Posts: 42,527
'Stralia
Shannow Offline
Shannow  Offline

Joined: Dec 2002
Posts: 42,527
'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.

Re: Ever wonder how RainX works? [Re: Shannow] #4563618
11/04/17 06:40 AM
11/04/17 06:40 AM
Joined: Oct 2005
Posts: 11,551
PA
d00df00d Online content
d00df00d  Online Content

Joined: Oct 2005
Posts: 11,551
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.


2008 BMW M3 Sedan 6MT
Re: Ever wonder how RainX works? [Re: Scienceman] #4563653
11/04/17 08:16 AM
11/04/17 08:16 AM
Joined: Aug 2005
Posts: 7,264
Leamington, ON, Canada ..... r...
Papa Bear Offline
Papa Bear  Offline

Joined: Aug 2005
Posts: 7,264
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


2016 Dodge GC Deep Cherry 5W-30 Dino
2013 SYM Wolf Classic 150 T4 15W-40
2009 V-Star 250 Black Cherry 20W-50 Dino
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Re: Ever wonder how RainX works? [Re: Papa Bear] #4563680
11/04/17 09:02 AM
11/04/17 09:02 AM
Joined: Oct 2009
Posts: 2,859
Earth
Scienceman Offline OP
Scienceman  Offline OP

Joined: Oct 2009
Posts: 2,859
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!

Re: Ever wonder how RainX works? [Re: Scienceman] #4563711
11/04/17 09:35 AM
11/04/17 09:35 AM
Joined: Jun 2003
Posts: 5,978
Illinois
SHOZ Offline
SHOZ  Offline

Joined: Jun 2003
Posts: 5,978
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.


2008 Hyundai Accent 1.6L 5 sp manual hatchback
2010 Hyundai Genesis Coupe Track 2L Turbo 6sp manual
Re: Ever wonder how RainX works? [Re: Scienceman] #4563734
11/04/17 09:53 AM
11/04/17 09:53 AM
Joined: Jun 2015
Posts: 4,937
New England
Virtus_Probi Offline
Virtus_Probi  Offline

Joined: Jun 2015
Posts: 4,937
New England
Where did the nitrogen go??


2014 Forester XT, 95000 miles
Last Change;
M1 0W30 AFE d1G2
Tokyo Roki 15208AA170 filter
Re: Ever wonder how RainX works? [Re: Scienceman] #4563743
11/04/17 10:06 AM
11/04/17 10:06 AM
Joined: Jun 2002
Posts: 18,476
Elizabethtown, Pa
Al Offline
Al  Offline

Joined: Jun 2002
Posts: 18,476
Elizabethtown, Pa
Thanks


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