Efficacy of Gush ClearCool: test results

3 Min
Efficacy of Gush ClearCool: test results

3 Min

If you’ve landed on this page, that means you’re getting serious about cooling your home the earth-friendly way. Gush ClearCool, our solar window films, were specially created to glide on your windows and protect you and your furniture from the harmful effects of the Sun. These films come in 5 different variants — each with a different tint. Depending on your needs, you could opt for total transparency or total privacy.

How does Gush ClearCool stand the test of science? We put our products through rigorous testing to attain accurate numbers and evidence to back up our claims. The purpose is to prove that Gush ClearCool films are able to reduce the amount of heat that is transferred from the exterior environment to the interior. This is beneficial for people living in tropical climates with high temperatures.

What kinds of tests were conducted?

The optical and thermal property test report analyses multiple properties imperative to solar films using the glazing system Solar/Luminous/Thermal property tests. Namely to determine the following:

1. Ultraviolet (UV) light blockage

2. Factors contributing to heat transmittance (Visible light transmittance, Shading coefficient, Heat emissivity)


The test results

Disclaimer: these results are based on the films applied onto glass. Our product names are named after VLT percentages tested on just the film alone.

Product Variant Visible Light Transmittance (VLT) Solar Energy Transmittance Shading Coefficient Emissivity UV Rejection (UVR)
CC05 (darkest) 6.3% 6.6% 0.4 0.900 99.7%
CC15 20% 12.9% 0.5 0.904 99.5%
CC35 37.1% 23% 0.5 0.898 99.3%
CC50 49.7% 24.4% 0.5 0.899 99.4%
CC76 (lightest) 69.6% 31.9% 0.6 0.896 99.1%


What do these numbers mean? Read on for breakdowns of each category and how they differ from variant to variant.

Visible light transmittance (VLT)

Gush ClearCool comes in multiple tints. With each tint, the results vary. The higher the value, the more light is transmitted.

Our CC05 variant has a visible light transmittance of 6.3% while the CC76 variant has a value of 69.6%. This shows the stark difference between our darkest shade (05) and our lightest shade (76). Either way, regardless of the amount of light it allows in, the films still block out harmful UV and IR radiation.


Solar Energy Transmittance

CC76 has a solar energy transmittance of 31.9%, meaning it blocks out 68.1% of solar energy, allowing lesser heat to reach interior spaces. Meanwhile CC05 blocks out 93.4% of solar energy.

Shading coefficient

The shading coefficient refers to the film’s ability to transmit solar heat. With a lower shading coefficient, it means the film transmits less heat from the exterior to the interior, therefore having a greater shading ability. CC76 has a shading coefficient of 0.6 while CC05 has a shading coefficient of 0.4.


The emissivity refers to the transfer of heat from a material to its surroundings when a material absorbs heat. When heat is absorbed, a material with higher emissivity emits more heat to its surroundings. Whereas, a material with lower emissivity emits less heat to its surroundings. CC76 has an emissivity of 0.896 while CC05 has an emissivity of 0.90.


UV Rejection (UVR)

The UV Rejection refers to the amount of harmful radiation that is reflected away. The higher the value, the better the rejection rate, and the more heat is reflected away from the window’s surface. For CC76, the UVR returned with a result of 99.1% while CC05 reaped 99.7%.


1. Gush ClearCool helps to reduce indoor temperatures while being environmentally friendly (does not emit greenhouse gases) as compared to traditional methods of cooling such as air-conditioning.

2. Blocks up to 99% of UV rays, keeping people and furniture safe from its harmful effects. Long-term UV light exposure can lead to an increased risk of skin cancer, faster skin aging and a weakened immune system.

    Read up more about the science behind Gush ClearCool here. Enquire and get your films here.

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