1 Scope
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.
Open preview (PDF)Solar thermal electric plants - Durability of silvered-glass reflectors. Laboratory test methods and assessment