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N Nanometer (nm). Unit of length equal to 10 - 9 meter. S Saturation. The attribute of color per- ception that expresses the degree of departure from the gray of the same lightness. Spectrophotometer. An instrument that measures light at many points on the visual spectrum, re sulting in a curve. Spectrum. Spatial arrangement of electromagnetic energy in order of wavelength. Standard. A reference for comparing measurements. T Tristimulus. Of or relating to values that give the amounts of the three col- ored lights, or receptors: red, green, and blue. Tristimulus colorimeter. An instru- ment that measures tristimulus values and converts them to chromaticity com- ponents of color. Adapted with the kind permission of X- Rite, Inc. from A guide to Under stand - ing Color Communi cation (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 (%) = Coverage in ft 2 /lb at 100% efficiency Specific gravity × Film thickness Source: Protech Chemicals, Montreal, Que. POWDER COATING, December 2017 7 COLOR MEASURING GLOSSARY