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To achieve good repeatability and reproducibility, test methods must be standardized. This chapter gives a general overview of the most common test methods relevant to wood coating with reference to some existing standards wherever possible. It also outlines the objectives of testing, which include coatings development (RD this could be a test method but in many cases standards go beyond this and include procedures, or “codes of practice.” Standards facilitate trade, exchange, and technology transfer through enhanced product quality and reliability at a reasonable price, improved health, safety and environmental protection, reduction of waste, greater compatibility and interoperability of goods and services, simplification for improved usability reduction in the number of models, and thus reduction in costs and increased distribution efficiency, and ease of maintenance. While characterizing liquid coatings, compositional aspects, solid content, pigment content, density, and determination of the volatile organic compounds or content are kept in mind. Viscosity, pot life, and minimum film formation temperature are the properties of liquid coatings related to application, while transparency, color, and gloss are the properties related to appearance. Coatings' performance depends upon thickness of film, adhesiveness, surface hardness, and stackability. Coatings are both for exterior use and interior use. |
