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The appearance a coating provides can sometimes be just as important as is protective properties. Ever-growing budget concerns have increased the demand for coatings that provide a longer lasting aesthetic finish. This paper will explain the basic terminology, testing procedures, analytical instruments and specification development for coating color, gloss, reflectivity and other appearance parameters. The appearance characteristics of various coatings will also be discussed.
At present multiple standards on blast-cleaned surfaces are in use depending on region and specifications of the project. However, most standards are relatively clear on the description of a surface some overlap each other. These overlaps are often considerate as the norm for the most comparisons between ISO and related documents, however, sometimes are significantly off. Some of these documents will be highlighted to compare the results and their impact on the coating job.
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In this paper, I will discuss such an example of when the predicted service of the coating determines that a more dynamic method must be utilized. I will discuss testing that was conducted for immersion service where flow of water over the surface was a major consideration. The question of how well the adhesion would hold up in real life service could not be properly answered by the degree of failure in this case. I discovered that the more important consideration was the survivability of the coating if a defect were introduced.
An NSRP-sponsored project investigating the cost of coatings QA suggested that current QA/QC processes have a high tendency to lead to conflict. Survey data collected during the project indicates that one in 20 inspection checkpoints is likely to result in a dispute. Some of these disputes may simply arise from the expected variability in standard coating QA test methods. Data regarding the reproducibility of coating QA measurements is generally not well understood and, in some cases non-existent. The paper will discuss the reproducibility of various measurements used in the industrial protective coatings industry.