Geoshield?

[Guest dave1290]

Has anyone worked with Geoshield's IRis 60 or 70? How about Bekaert's Hilite? How do they compare?

Thanks!

[GLASSPROTECT]

Don't compare those two films!!!

[Guest TintPoser]

you can't compare an XIR type of product, something that has a high IR reflectance, to a product that has an extreemly high absorbtion rate like ceramic or chemical inhibt type films.

Geoshield claims that their product is a ceramic. It's prioced about what ceramics are. It feels too thin and a lot less stiff than any of the other ceramics. It really feels like the chemical inhibit films. When I used to do heat reflectance demonstrations, the 3m prestiege, Huper Optik Drie and Sech, Highlite 70, Vista Spectra select 70 and V-Kool 55 - 40 - 70 had awesome heat/IR reflectance. Huper optik ceramics, MAC, harmony and geoshield had low IR transmission rates, but virtually NO IR reflectance. These films got extreemly hot to the touch and even after letting them sit while I demonstrated other films, they were still hotter (even after cooling for a while) than the conventional and IR reflecting films.

I offered geoshield as a cost efective alternative to hilite/V-kool 70. I offered a much more limited warranty and had only 1 person take me up on it. The geoshield installed a lot easier than the highlite, only because the geoshield uses a much more agressive adhesive. Since we worked with mostly V-Kool PS films, the installs were about the same. The highlite peeled at the corners. (To my understanding) This has been corrected with the use of their install slip activator. Couldn't tell you since I never used it. If it were a matter of a stronger product, use the highlite. BSF will be quicker to stand behind the installation than geoshield.

[Guest filmdit]

you can't compare an XIR type of product, something that has a high IR reflectance, to a product that has an extreemly high absorbtion rate like ceramic or chemical inhibt type films.

When I used to do heat reflectance demonstrations, the 3m prestiege, Huper Optik Drie and Sech, Highlite 70, Vista Spectra select 70 and V-Kool 55 - 40 - 70 had awesome heat/IR reflectance. Huper optik ceramics, MAC, harmony and geoshield had low IR transmission rates, but virtually NO IR reflectance.

These films got extreemly hot to the touch and even after letting them sit while I demonstrated other films, they were still hotter (even after cooling for a while) than the conventional and IR reflecting films.

Funny beyond words...

[Guest dave1290]

thanks for your info!

[TINT]

Funny beyond words...

[Guest vclimber]

Funny beyond words...

Yeah and it gets even funnier when someone tries to explain where all of that energy goes...

[Guest filmdit]

I would assume that a portion of that heat has to be radiated back inside the building.

John...

If you can pin down Steve DeBusk at his CPF's desk, he can give you a thorough explanation of what you are asking. He is an Energy Engineer with much better credentials than any of us. Steve has been my source outside Google for any answers I may be in search of concerning film performance... His boss would be my second source, R&T third.

What I remember of his explanation is... With film installed on the interior (of course):

Single pane approximately 50/50 of the absorbed energy radiates interior/exterior.

Dual Pane approximately 75/25 radiates interior/exterior.

Provided there exists wind passing over the outer glass surface in excess of 7.5 mph.

Heat always seeks cold or cooler, not the reverse (this we learned in HS). Though, film performance numbers are obtained through the use of computer models.

[Guest vclimber]

It's starting to get funnier.

Steve DeBusk is very knowledgable and I can't say that enough, however, he works for CP Films and you are asking a question about a film made by Southwall. Wouldn't it be better to telephone Dr Dei or Dr Niel Bergstrom at Southwall and ask him that question about the film that he developed?

[Burns]

Hey guys, my name is Burns and I am the president of Geoshield. Thank

you for your interest in Geoshield and our products. I will be happy to address and questions you have about our products.

As many of you know, with window film there are always tradeoffs between performances, durability, ease of installation, and aesthetics. Our IRis 70 product is a ceramic film that is designed for high visible light transmission and low solar heat gain. And this is exactly what it does.

IRis 70 is metal/dye free and is designed to have very low reflectivity.

Because of its low reflectivity it is attractive to customers who want a virtually clear

film with good visibility, in and out, night and day and it is an

excellent film for day lighting. By not using metals our films are

extremely durable and not susceptible to oxidation and corrosion which

is a major issue down here on the coast. Edge sealing is not required

because the materials we use are extremely hydrophobic and there is no

place for oxygen molecules to bond.

Yes, window films that are highly reflective have lower SHGC but that

also usually means adding metals. But that does not mean an excellent

SHGC can not be achieved with ceramics through primarily absorbing

thermal energy and reflecting a small portion of thermal energy. IRis

70 window film has an absorption of 49% on 1/8th glass and 54% on 1/4

glass. There is heat transfer of this absorbed thermal energy and it

occurs through conduction, convection or radiation. Environmental

conditions and substrates dictate this heat transfer. A measure of

SHGC takes all these factors into account. When measuring SHGC using

set environmental conditions I.e. inside/outside temperatures, exterior

wind speeds, etc and different substrates we can give a very accurate

measurement of thermal energy exchange and SHGC. Under standard environmental conditions more of the absorbed energy is transferred to the exterior. About 70%.

There have been a lot of questions raised about ceramic films and their performance. I invite anyone who is seriously interested in becoming a Geoshield customer and wants more information about our products to contact me at www.geoshieldusa.com or give me a call 1-866-234-6133. Thank you for allowing me to post. I really appreciate this site and all its members efforts.