Solar Properties of roller blinds screen fabrics
Solar properties are important when selecting screen fabrics, as the efficiency of the fabric can vary depending on the colour chosen. When advising a customer on the fabric that they should use there are a number of factors
that should be considered.
SOLAR OPTIC PROPERTY DEFINITIONS
Ts Solar Transmittance
This is a measure of the percentage of the solar energy transmitted through the blind fabric. A lower value indicates less heat is transmitted into the room.
Rs Solar Reflection
This is a measure of the percentage of the solar energy heat which is reflected by the blind fabric. E.g. Vividshade White reflects 62%, while black reflects only 7%.
As Solar Absorbance
This is a measure of the percentage of the solar energy absorbed by the blind fabric. A higher As value indicates the blind fabric absorbs more heat.
N.B. The sum of transmittance, absorbance and reflection always = 100%
(Ts + As + Rs = 100).
Tuv Ultraviolet Transmittance
The amount of UV that is transmitted through a fabric. A Tuv of 7 means that 93% of the UV is blocked. This is important when considering protection of flooring, furnishing fabrics and furniture against fading.
Tv Visual Light Transmission
This is a measure of the percentage of visual light (level of glare) transmitted through the blind fabric. A lower Tv value indicates less light is transmitted through the blind and into the room.
O-F Openness Factor
Measures the proportion of holes in a woven fabric. The openness factor can vary slightly from colour to colour. Openness also affects the degree of visibility.
G-Value
This is the percentage of solar radiation that is transmitted through a fabric. The lower the figure the better the fabric performance (A g-value of 0.28 = 28%).
G-Total
This is the percentage of solar radiation that passes through the blinds and the window.
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