Unidirectional perspective is a special need. The effect we want to achieve is that the observer wants to observe the observed person, and the person who wants to be observed cannot be aware that he is observed. Therefore, we need one-way perspective products. But what do we need to translate this requirement into specific parameters?
Why do we need reflectivity?
As we all know, one-way perspective products look like a mirror to the observed person, so we can't detect the existence of the observer. Therefore, higher reflectivity is the most intuitive parameter to judge the quality of a unidirectional perspective product. We only need to observe whether the reflection is clear after the glass is formed and whether it is pure silver like a mirror, so we can judge the quality of one-way perspective products.
Through reflectivity, we can judge that unidirectional perspective glass is better than unidirectional perspective film in reflectivity.
Transmittance is the key to determine whether the observer can see the observed person. The higher the transmittance, the clearer the observation. Through comparison, we can intuitively judge that the transmittance of unidirectional perspective glass is higher than that of unidirectional perspective film. Therefore, in terms of light transmittance, unidirectional perspective glass is better than unidirectional perspective film.
Because unidirectional perspective products are mostly used in special places (public security organs, schools and hospitals), glass itself is a fragile product, and safety is very important. Both unidirectional perspective glass and unidirectional perspective film have certain safety. Unidirectional perspective glass itself is laminated glass, which belongs to safety glass within the scope of national standard. Due to its high viscosity, unidirectional perspective film can stick to the glass after the glass is broken, so that the glass is not completely broken, which can also ensure the safety of users to a certain extent. Therefore, from the perspective of safety, unidirectional perspective glass and unidirectional perspective film have certain safety performance. It should be noted that when users need bulletproof effect, they can only select unidirectional perspective glass instead of unidirectional perspective film, because bulletproof glass is buffer glass composed of multi-layer glass, which cannot be achieved by unidirectional film. Reference: national standard for bulletproof glass: GB 17840-1999
4. Absorption rate
In addition to transmittance and reflectivity, what we need to pay attention to is also a crucial one, absorptivity!
Reflectivity + transmittance + absorptivity = 100%
In the practical one-way product application, all we need is transmittance and reflectivity. We hope that the higher the transmittance and reflectivity, the better, and the lower the absorption, the better. In other words, the lower the absorptivity, the higher the corresponding reflectivity and transmittance. How should we judge the absorption rate when actually selecting products? In addition to using professional instruments, we can also judge the way through light by the naked eye: we aim different one-way perspective products at the sun.
5. Durability (corrosion resistance)
Traditional one-way perspective glass and one-way perspective film have problems in durability. The average service life is between 1-3 years, mainly because the traditional one-way perspective glass can not be scrubbed, and there is a great risk of film falling after scrubbing. After the coated glass has been used for a long time, the adhesive property becomes worse, and the film cracks and falls off. The latest unidirectional perspective glass overcomes the above shortcomings. It not only surpasses the old products in light transmittance, reflectivity and absorption, but also is safer and more durable.
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