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How does solar film work?

Updated: Feb 29

Window film is a self-adhesive polyester film that is applied to glass surfaces. It is used as a retrofit application for existing glass on homes and commercial buildings in order to upgrade solar control, safety and appearance.

Solar radiation from the sun is divided into 3 components:

1. Visible light that we can see

2. Infrared rays that we can feel as heat

3. Ultraviolet (UV) rays which are invisible.

As solar radiation strikes a piece of glass, window film acts as a screen to block harmful UV rays as well as regulate the levels of heat and light passing through the glass. The amount of heat and light rejected is dependent upon the type of window film selected.


Utility bills in Hong Kong can get expensive during the summertime but as we all know, it’s a necessary to keep the inside of your home cool and refreshing. Solar film for home windows helps minimise the dependence on air conditioners by reflecting infrared rays and ultraviolet rays and are a quick, easy, and inexpensive way of reducing energy costs.

An inexpensive alternative

Blinds and curtains may help protect you and the furnishings you own from the sun, but they obstruct outside views and prohibit you from enjoying natural light. This is not the case with window film. Solar window films not only reflect harmful rays from penetrating your windows but allow a regulated quantity of natural light to enter your home. In addition, you can say goodbye to the daunting task of cleaning and dusting involved with blinds and curtains.

An energy-efficient solution

Air conditioners require a large amount of energy to operate properly, especially during the summertime. Solar window films are a great alternative for keeping your rooms cooler while minimising the energy used by the air conditioners - and in turn reduce those dastardly bills too! They help make your home more energy efficient, which is a mutually beneficial situation for both you and the environment.

Adds a touch of elegance

With decorative solar window film, you can transform your windows from ordinary into extraordinary. Decorative window film is a great solution for privacy and can give your windows a frosted or etched glass look at a fraction of the cost. Whether you’re looking for opaque, semi-private, and light diffusing window film, we have a variety of styles that will suit your individual needs. Just contact us and our office can find the right fit for your home or office.

Contact us

There is one golden rule in the window film business: the best window film in the world has little or no value unless it’s properly installed. So before you jump the gun on making a purchase, do your research to ensure you’re getting an experienced window film installer who can 1) help you select the correct solar film, 2) install it correctly, and 3) provide you with a manufacturer’s warranty in case anything were to ever get damaged.

For more information, contact Eco Glass by email on or by Whatsapp or call on 5528-8824

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