1 Visible light transmittance

This is an indicator of the brightness of sunlight entering a room. 50% or above indicates that there is no sense of darkening, while 70% or above indicates that the presence of the film is almost unnoticeable. UNIGLOBE R&C products use materials with 70% or higher visible light transmittance to achieve both functionality and brightness.

2 Shading coefficient

This is an indicator of the effect of solar heat blocking. It indicates the ratio of solar radiation that enters a room when film is installed on the glass, with a value of 1 being equivalent to the amount of solar radiation that enters the room through a clear 3mm sheet of glass. The lower the value, the greater the heat shielding effect, which helps reduce the load on cooling systems. Typically, values of 0.85 or below are considered to represent a certain effect. Additionally, the method of measuring and calculating this value is defined by the Japan Industrial Standards (JIS), and the values listed in each manufacturer's catalog are based on this standard. However, please be aware that some manufacturers may use figures based on their own standards or non-Japanese standards.

3 Thermal transmittance

This is an indicator of the heat blocking performance when film is installed on the glass. When the temperature on one side of a structure like a wall or window differs from the other side, heat will pass through that structure from the warmer sider to the cooler side. The "U-value" refers to the amount of heat that passes through one square meter of glass per hour, expressed in watts, when there is a temperature difference of 1°C (or 1K) between the inside and outside. The smaller the U-value, the better the heat blocking effect. The units are expressed as W/(m²・K), which is read "watts per square meter Kelvin."