AS 1301.454S-1992
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Methods of test for pulp and paper, Method 454S: Determination of opacity (paper backing) – Diffuse reflectance method
A variety of test methods are used for measuring opacity depending on the purpose of the measurement. This Standard prescribes a method for measuring the type of opacity which governs the extent to which one sheet of paper visually obscures printed matter on underlying sheets. Technically equivalent to ISO 2471:1977.
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