Standards Development

Scope

This document provides the test methods for regular luminous transmittance, switching time, haze, insulation resistance, low temperature resistance, colour uniformity, switching cycles and radiation durability test for electro-switchable glazing for road vehicles.

This document applies to switchable glazing in response to applied voltage or current for road vehicles.

Purpose

With the increasing demand from customers of privacy and environmental comfort, new products called electro-switchable glazing are widely used as vehicle side windows or sun-roof.

Because these two types of glazing have various transmittance states, which is changed by applying electric field, the optical properties are changed when changing states. For determining the performance of glazing when switching between different states, following test methods shall be considered:

a) Regular luminous transmission shall be tested for glazing in different state;

b) Switching time test for determining the speed when switching between different states, which is important to the comfort feeling of drivers and passengers and maybe related to the safety during driving;

c) Insulation resistance test, which is related to electricity safety;

d) Radiation durability test, which is for determining the cycles during radiation and also related to the lifetime of products.

e) ……

After testing following this standard, customers can choose suitable product base on the test result of different transmission range, different switching time, different switching cycles and so on.