First, the quality judgment of the frosted film
Light transmittance
One of the main functions of the matte film is to provide privacy protection while allowing a certain amount of light to pass through. A high-quality matte film should have good light transmission properties, which can ensure uniform indoor light and avoid dark corners. When purchasing, you can observe the effect of the film after light transmission through light testing to ensure that it will not affect the comfort of work or life.
Uniformity
Observe the surface of the film to see if the frosting effect is uniform. Some low-quality matte membranes may have inhomogeneities in the process, causing the surface of the film to look blurry or spotted. A high-quality matte film should have a smooth and delicate surface with no visible bubbles, wrinkles or blemishes.
durability
Frosted films need to withstand sunlight, temperature changes, and air pollution over time, so durability is important. The technical parameters of the product, such as the UV resistance of the film, the service life, etc., can be obtained from the seller. Choosing products with well-known brands and good customer feedback is often a better guarantee of durability.
Ease of application
A high-quality matte film should be easy to stick to the glass and leave no air bubbles when installed. Optionally, you can apply for a small-area test to observe how the film behaves after pasting to ensure that it fits well.
Second, the quality judgment of the heat insulation film
Thermal insulation
The main function of the heat insulation film is to block the sun's heat and reduce the indoor temperature. When purchasing, you can ask for data such as the thermal insulation coefficient (SHGC) and reflectivity of the membrane, and the ideal thermal insulation film should have a low solar heat gain coefficient (SHGC value) to effectively insulate from the intrusion of external heat.
UV blocking effect
Thermal films often also block UV rays, reducing discoloration and skin damage caused by sunlight ingress in the room. An effective heat shield film should usually block more than 90% of UV rays, and the relevant test reports or certifications should be checked at the time of purchase.
Clarity and reflections
The clarity of the film is also a consideration, and a good quality film should maintain its performance without compromising the view. Observe the reflective effect of the film to ensure that a good visual experience can be maintained in different light conditions.
Durability and maintenance
Inquire about the product's anti-yellowing and cleaning maintenance requirements. A high-quality film should resist yellowing and fading caused by sunlight and be less susceptible to damage during cleaning and maintenance.
3. Physical comparison and actual experience
Field trips
If possible, it is advisable to visit a model room or case where frosted film and thermal insulation film are used to experience the visual effect and function of the project. Through actual observation, the quality and effect of the membrane can be more intuitively understood.
User feedback and reviews
Before making an online purchase, it's a good idea to refer to other consumers' feelings and reviews. Real user feedback often provides a more comprehensive picture of product quality.
After-sales service and guarantee
Choose a merchant that offers good after-sales service, and you can get timely help if you have any problems after installation. Professional after-sales service is also a hint to judge product quality.