shane 21 ,
see attachment,
B.E.

You are judged not by what you know, but by what you can do.

• https://www.diamondvogel.com/blog/light-reflectance-value-what-do-those-num

Thanks for link, berkshire.

Best product I saw over there was 90% Light Reflectance Value (LRV), unless I missed something.

- Shane

Essentially a gloss untinted white paint is going to be as good as you can get.
B.E.

You are judged not by what you know, but by what you can do.

That's my thinking, too.

Just trying to find what's best, to get every reflective % possible,
both for PAR light and to minimize heat absorption into the surfaces.

Higher titanium dioxide %'s in formulation seems to be key, but then
there's also some nano tweaks being utilized by some to boost it, too.

Looking into roof top coatings, too. Some claim above 90%, as long as
kept clean.

- Shane

Sure, there's silver, but that's none trivial for maintenance, although there are supposedly manufacturers that claim moisture resistance. Generally, engineering solutions try not to depend on a single component.

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers Entire Forum list http://www.eng-tips.com/forumlist.cfm

IRstuff,

Are there any commercially available, reasonably priced, silver nano particle paints or coatings available?

- Shane

No, trying to achieve the "best" is a fool's errand, and certainly not an engineering imperative.

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers Entire Forum list http://www.eng-tips.com/forumlist.cfm

Trying to determine and acquire the best available is not.

If interested, best commercially available product I've found so far...

http://www.nationalcoatings.com/acryshield-ultra-h...

Bright White

Solar Reflectance (ASTM C1549)

Initial .92
Aged .87

NASA has used some on exterior of Ares I-X Rocket, high reflectivity being primary reason.

If you know of anything better, that's readily available and reasonable, please let me know, thanks.

- Shane