Request Info

Carrara* Glass Panels - Approximately 0.25 inch (6mm) thick

Black glass is used in widely referenced high-precision ASTM Method D 2805, and related hiding power test methods. After measuring the reflectance R0 of the dry film, a defined area is scraped from the glass and weighed to obtain the spreading rate or original wet film thickness. Rof the paint film is obtained from a separate test application. The hiding power is then calculated from the appropriate Kubelka-Munk equations found in the ASTM method.

Both black and white glass panels are used in U.S. Federal Test Method 141-4122 and CGSB Method 1-GP-71-14.7 for measuring hiding power. The latter method also provides for direct wet film thickness measurements using a Pfund or Interchemical type of wet film thickness gage, as described in ASTM Method D 1212.

These methods depend on the unique hardness and levelness characteristics of glass substrates. Leneta black glass is much superior in levelness to previously available striated types.

*Carrara: Term used originally in referring to the white marble obtained from quarries near the town of Carrara in central Italy; later applied to heavy architectural glass, both black and white.
** Blacklite: Refers to Leneta type of black Carrara glass

NOTE: Although visually not as opaque as true Carrara Glass, Blacklite Glass has a transmission of less than 1%, making it an adequate substitute for Carrara Glass.