Another example of a certified company is whether the company producing these films are part of the International Window Film Association (IWFA). The IWFA is an educational resource for consumers and industry professionals to learn more about window film. The IWFA only allows a number of manufacturers to be apart of their association because of their strict criteria as a producer of window film. Therefore, with this certificate, it will prove that their specifications are accurate as it is important to the IWFA to maintain the standards to consumers.
1) Visible Light Transmittance –
Or VLT in short, is the amount of light that is able to pass through the window film. This is a subjective specification as different customers prefer different levels of light coming in. Visible light contributes to about 43% of the heat coming from the sun. The lower the VLT the darker the film, the more heat is rejected.
2) Infrared Rejection –
Or IRR in short, is the amount of infrared rays being rejected. Infrared rays are the biggest contributors of heat. Making 55% of total heat. Infrared is what causes the burning sensation we feel on our skin and the one that causes discomfort whenever it is hot. The higher, the better, the more heat rejected.
3) Total Solar Energy Rejected –
Or TSER in short, is the total amount of heat that is being rejected. This amount is calculated based on the amount of light passing through (VLT), amount of Ultra Violet Rays Rejected and Infrared Rays (IR) Rejected. The higher, the better, the more heat rejected.
4) Ultraviolet Rejected –
or UV in short is the most harmful component of heat produced by the sun. It is one of the leading causes of skin cancer and premature ageing on the skin. However, across all films with different technology. It is able to reject at least 99% UV Rays. It consist about 5% of the total heat.