Black glass panels

Black glass is used in the widely referenced, high-precision ASTM method D 2805 and related opacity testing methods. According to the Measurement of the reflectance R0 of the dry film a certain area is scraped off the glass and weighed to determine the propagation rate (spreading rate) or the original Wet film thickness to be determined. R∞ of the colour film is determined by a separate test application. The opacity is then determined using the corresponding Kubelka-Munk equations calculated using the ASTM method.

Black glass plates are used in U.S. Federal Test Method 141-4122 and CGSB Method 1-GP-71-14.7 to measure hiding power. The latter method also provides for direct measurement of wet film thickness with a wet film thickness gauge as described in ASTM Method D 1212.

These methods depend on the unique hardness and flatness properties of glass substrates. Although it is not as optically opaque as real Carrara glass, it has Leneta Black Glass has a Y-reflectance of less than 1 % and is therefore a suitable substitute for Carrara glass.

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