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Gray Scale Hiding Power Paint Chart

Art. No.: 12737

Leneta 24B Opacimeter Chart 250/Bx

The Gray Scale Hiding Power Paint Chart is a sealed paint test chart with six stripes on a white field, ranging in shade from light to dark gray and black. The stripes are numbered from 1 to 6 with increasing darkness and provide contrast steps suitable for demonstrating the hiding power of typical trade sales coatings.

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$152.00

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The reflectance values of the numbered stripes are selected with the objective that their color differences with respect to the white surround will be in the geometric sequence: 2, 4, 8, 16, 32 and 64 CIELAB units. The defining variable for the gray stripes is not reflectances as such, but the ratio of the gray to white reflectance, G/W. The table gives their specifications and tolerances, which are the same as stated in ASTM Method D5150 for Form CU-1.

  • Size: 7-5/8 x 11-3/8 inches (194 x 289 mm)
  • Thickness: 12 mils

 

Technical Data Chart
Data
Stripe No.Color Difference2Ratio G/W3Reflectance G%41. As stated in ASTM Method D5150 for Form CU-1.
2. This is ΔE*ab, the color difference with respect to the white background, expressed in CIELAB units as defined in ASTM Method D2244.
3. G/W = (1 - ΔE*ab/107.7)3. This equation is derived from ASTM Method D2244 and assumes that for neutral gray versus white, the values ΔE*ab and ΔL* are sufficiently close to be considered equal for the purpose of this test method.
4. These values vary somewhat with the reflectance W of the white area, which is normally 80 ± 2% inter-batch and ± 0.5% intra batch. Values shown here are calculated for W = 80%.
12 ± 12.5%0.945 ± 0.00775.6 ± 0.6
24 ± 12.50.893 ± 0.01371.4 ± 1.0
38 ± 12.50.793 ± 0.02463.5 ± 1.9
416 ± 12.50.617 ± 0.04249.4 ± 3.4
532 ± 12.50.347 ± 0.05527.8 ± 4.4
664 ± 12.50.067 ± 0.0375.3 ± 3.0
Includes 250 per box