IEC 62862-3-6:2026 This document specifies laboratory test methods to assess the durability of silvered-glass
reflectors with high technical performance to be used in concentrating solar technologies. The
reflectors within the scope of this document are composed of a float-glass substrate and a
reflecting silver layer on its back-side, which is protected by a thin copper layer and an
anticorrosive paint system composed of a primer and a top coating, and an optional intermediate
coating.
This document defines multiple accelerated aging tests on reflector samples of size of 10 cm ×
10 cm or larger. It defines the measurement methods to determine the degradation parameters
used for assessment and the acceptance criteria of the accelerated aging tests.
Annex A of this document outlines the procedure to apply this document to reflector types of
different composition than that of the silvered float-glass reflectors described above.
Annex B provides information on how to approximately correlate the measured degradation of
selected accelerated aging tests with outdoor exposure in different environments. These
correlations are limited to silvered float-glass reflector types with the abovementioned layer
stack, since differing coating types are likely to introduce unforeseen degradation modes, which
possibly will not be triggered under the proposed testing conditions.

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