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Some faults in the overall approach currently used in evaluating the durability of materials, particularly in relation to the differences between organic and inorganic materials, are discussed. The strategies used in laboratories with which the author is associated are outlined, and examples from the fields of plastics, organic coatings, and sealants are reviewed. Principles arising from work on inorganic as well as organic building materials, and required for regimens for predicting permanence, are stated.
evaluation, performance, durability, accelerated testing, organic coatings, organic building materials
Research officer, National Research Council of Canada, Ottawa, Ontario