IR rejection #'s between films

[Guest tallscott]

Here's my question! What are the IRR rejection #'s for non spec. selective films? When you look at the TSER rejected between the 2 it seems somewhat close. Closer than I expected at first glance. But its not close in IR and vis light! I got the IRR #'s for v-cool but wonder what they are for "Straight" films. Are they hidden #'s ?

[Guest haroldshouseoftint]

non "ceramic" films have pretty much no IRR thats why they are not listed, that is why you have to go a very dark VLT to get the same TSER as a light "ceramic" film

Hope thats what you were asking,

[Guest tallscott]

Thanks! OK. They have to have some IRR measurement. So would spec-select say be 92% and others 20% ? Or maybe 30% or some kind of gauge to compare the IR reduction of each?

Like "This is a spider monkey!! and THIS is a SPIDERMONKEY ALL JAKED UP ON MOUTAIN DEW!!!

[Guest haroldshouseoftint]

Ya something like that, My dist has an IR meter, and I ran some reg auto film through, and it had like 10 - 15 % IRR, are you refering to auto film or flat glass films

[Guest tallscott]

Yea, Flat! I was kind of think'in along those lines!! Thanks!!

[Guest haroldshouseoftint]

I've honestly never tested reg FG films, I'll do that tommorow and let ya know what I come up with

[Guest darkdan]

It all depends on where you measure it.

Most films should be rejecting a great deal of near infrared.

The special ones brag about rejecting a certain amount measured at a certain part of the far infrared.

TSER/SHGC > IR rejection

[V4V]

The IWFA has a primer on this topic at their website http://www.iwfa.com

This is an interesting question and one that can tend to mislead the consumer into thinking that IR rejection is equal to heat rejection. The better numer is the SHGC numbers.

So. .the IR wavelength from 850 Nm to 2000Nm can be factored out to some degree. The actuall %rejection across the broad spectrum varies. One company has even tried to narrow it to 97% between 900-1000 which is clearly a suprious measurement atthe very least.

Caveat Emptor

[Guest darkdan]

Almost all say, "Measured at xxxxnm" instead of claiming to reject the whole spectrum.

[Guest tallscott]

Thanks for your help. Since IR is a the largest part of solar spectrum, and the NIR conversion to FIR is how most heat is generated and since FIR isn't included in the solar spectrum it would seem that the more you block it's maker NIR the more you reduce it or heat. Right? So films that block 92% in the IR range are going to reduce the major heat source (NIR) better, thereby providing a much higher reduction in heat than other films not as strong in the IR area. Or is that what They want me to beleive?