Artificial Accelerated Weathering
Prior to the tension tests, specimens of Type HW were subjected to artificial accelerated weathering according to ETAG 002, Clause 126.96.36.199.1. In this procedure, test specimens are exposed to 1000 hours of immersion in hot demineralized water with a water temperature of 45±1 ° C while simultaneously undergoing irradiation by artificial light (UV, VIS, IR) through the nonimmersed upper glass plate. Immersion and light exposure was carried out in a Heraeus Xenon Test 250 T accelerated weathering device. At the beginning and the end of the weathering, the intensities of the global (300-800 nm) and ultraviolet (UV) (300-400 nm) radiation were determined. The global intensity fell from 440 W/m2 (initial) to 437 W/m2 (final), the UV intensity from
27.3 W/m2 to 26.9 W/m2 (note that ETAG002 and ISO 11431 , referenced in the ETAG, stipulate an irradiance at the surface of the test specimens between wavelengths of 290 nm 800 nm of (550±75) W/m2). After the test specimens were removed from the chamber they were conditioned for about 48 hours at ambient laboratory conditions prior to performing the tension tests.