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d-ColorMeasGloss-7-9_d-ColorMeasGloss 2charts_ 12/10/13 10:12 AM Page 8 8 POWDER COATING, December 2013 Spectrum. Spatial arrangement of electromagnetic energy in order of wavelength. N Nanometer (nm). Unit of length equal to 10-9 meter. Tristimulus colorimeter. An instrument that measures tristimulus values and converts them to chromaticity components of color. Standard. A reference for comparing measurements. S Saturation. The attribute of color perception that expresses the degree of departure from the gray of the same lightness. T Tristimulus. Of or relating to values that give the amounts of the three colored lights, or receptors: red, green, and blue. Spectrophotometer. An instrument that measures light at many points on the visual spectrum, resulting in a curve. Adapted with the kind permission of XRite, Inc. from A guide to Understanding Color Communication (Grandville, Mich.: X-Rite, Inc., 1993). POWDER COATINGS COVERAGE CHART A typical powder coatings coverage chart in square feet per pound at 100 percent efficiency Specific gravity Film thickness 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 1 mil 192.2 174.7 160.2 147.8 137.3 128.1 120.1 113.1 106.8 101.2 96.1 2 mils 96.1 87.4 80.1 73.9 68.6 64.1 60.1 56.5 53.4 50.6 48.1 3 mils 64.1 58.2 53.4 49.3 45.8 42.7 40.0 37.7 35.6 33.7 32.0 4 mils 48.1 43.7 40.0 37.0 34.3 32.0 30.0 28.3 26.7 25.3 24.0 5 mils 38.4 34.9 32.0 29.6 27.4 25.6 24.0 22.6 21.4 20.2 19.2 6 mils 32.0 29.1 26.7 24.6 22.9 21.4 20.0 18.8 17.8 16.9 16.0 7 mils 27.5 25.0 22.9 21.1 19.6 18.3 17.2 16.2 15.3 14.5 13.7 8 mils 24.0 21.8 20.0 18.5 17.2 16.0 15.0 14.1 13.3 12.6 12.0 9 mils 21.4 19.4 17.8 16.4 15.3 14.2 13.3 12.6 11.9 11.2 10.7 10 mils 19.2 17.5 16.0 14.8 13.7 12.8 12.0 11.3 10.7 10.1 9.6 The following formula can be used for figuring coverages other than those given in the chart: 192.2 × Transfer efficiency (%) Specific gravity × Film thickness Source: Protech Chemicals, Montreal, Quebec, CD. = Coverage in ft2/lb at 100% efficiency