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This part of ISO 22975 specifies definitions and test methods for materials, durability and performance of evacuated tubes. This part of ISO 22975 is applicable to all types of evacuated tubes. This document (EN ISO 22975-1:2016) has been prepared by Technical Committee ISO/TC 180 "Solar energy" in collaboration with Technical Committee CEN/TC 312 "Thermal solar systems and components", the secretariat of which is held by ELOT (Greece).