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This European Standard constituting a part 3 of the 12975 series of standards. The new standard will initially contain methods for assessment of absorber surface durability based on the method developed in IEA SH&C Task X. It is foreseen that similar method for reflectors and other collector components and materials will later on be added to this standard. (Whether requirements connected to these tests will be defined in the same standard or if they will be incorporated in part 1 has not yet been decided).