Actually, the coating needs to be hydrophilic rather than hydrophobic.
You want the water droplets to spread out into a film rather than bead
up. Rain drops are large enough to roll off a hydrophobic film but fog
droplets are too small to do this.
Dave Lane
Principal
Clavis Technology Development
On 9/2/20 11:16 AM, NEAL LANGERMAN wrote: ---
> Expanding on my previous reply - what is needed is a hydrophobic film
> that bonds to the interior surface of the goggle. This is exactly how
> Rain-X and related siloxane in alcohol products work.
>
> I have never tried one of those products on goggles; they work really
> well on shower doors.
>
> Easy experiment to do. Curious about the outcome.
>
> Neal
>
>
> Stay healthy and stay safe
> NEAL LANGERMAN, Ph.D.
> 5340 Caminito Cachorro
> San Diego 92105
> +1 (619) 990-4908
>
>
> From: ACS Division of Chemical Health and Safety
>
> Sent: Wednesday, September 2, 2020 10:50 AM
> To: DCHAS-L**At_Symbol_Here**Princeton.EDU
> Subject: Re: [DCHAS-L] Goggles & Face mask=fogging
>
>
>
> I wonder if any of the scuba divers in our midst (I'm looking at you,
> Neal Langerman), might have ideas. I know this has been discussed
> several times over the years but don't recall there being any really
> good solutions.
>
> D-
>
> Debbie M. Decker, ACS Fellow
> DCHAS Councilor
> Programming Co-Chair
> Retired Chemistry Dept. Safety Manager
> dmdecker**At_Symbol_Here**ucdavis.edu
> (916)616-7548
>
>
>
>
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