New Window Film Development (Photochromic Window Film)

Photochromic

• A substance that changes color when exposed to ultraviolet (UV) light, originally being colorless or tinted.
• When exposed to UV light, the color changes, but it returns to its original state once the UV exposure is removed.

Application Fields

• Used in sunglasses, polypropylene yarns, plastic products, building materials, cosmetics, stationery, and accessories.
• Currently under development for window film applications; however, durability degradation remains a major challenge for commercialization.

Challenges in Applying Existing Photochromic Materials to Window Films

• Current materials suffer from decreased durability due to environmental factors.
• Products such as sunglasses or accessories are only briefly exposed to external environments, so durability issues are less significant.
• In development for window film.

Development Goals for Applying Photochromic Materials to Window Films

• No yellowing should occur during outdoor exposure testing.
• Improve performance durability by blocking oxygen and moisture penetration.

New Window Film Development (Insulation Window Film)

What Is an Insulation Window Film

• The insulation window film, produced with domestic technology, is a type of window film applied to glass to maximize heating and cooling efficiency.
• It blocks solar energy entering through glass during summer and reduces the escape of indoor heat (far-infrared radiation) through windows in winter.

Characteristics of Insulation Film

• A functional film using multi-layer sputter (metal) thin-film coating technology, providing excellent insulation and heat-blocking performance.
• Offers visible light control, UV protection, and minimizes breakage and scattering after being attached to glass.
• Provides privacy protection through external reflection.

Advantages of Insulation Window Film

• Most window films introduced as insulation films are actually heat-blocking films. They block solar radiation to minimize indoor temperature rise in summer, but heat-absorbing types cannot prevent temperature rise in the film or glass and provide no insulation benefit in winter.
• Insulation window films are infrared-reflective products that effectively reduce cooling energy use during high summer temperatures. In particular, they reflect indoor far-infrared radiation back inside during winter, minimizing heat loss through windows and maximizing heating cost savings.