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TAPPI T 519 om-17 Diffuse Opacity of Paper (d/0 Degrees Paper Backing)
standard by Technical Association of the Pulp and Paper Industry, 2017
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TAPPI T 519 om-17 provides a measure of diffuse opacity (paper backing) of white and near-white papers,previously known as "printing opacity."The method may be employed for colored papers on condition that their reflectance (paper backing) isgreater than 20% and their diffuse opacity (paper backing) is greater than 45% (1).
The method is not suitable for highly transparent papers such as glassine.
This method employs d/0 geometry, illuminant C, and paper backing whereas TAPPI T 425 "Opacity ofPaper" employs 15/d geometry, illuminant A, both 89% reflectance backing and paper backing.
This method is similar to ISO 2471.