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1.1 This test method covers the determination of the opacity of paper.
1.2 Two different types of "white" backing are specified, leading to two different opacity values, in accordance with Section 3.
1.3 This test method employs 15° diffuse geometry, Illuminant A/2° and 89% reflectance backing or paper backing. For the measurement of opacity with d/0° geometry, Illuminant C/2° and paper backing (see TAPPI T 519).
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D585 Practice for Sampling and Accepting a Single Lot of Paper, Paperboard, Fiberboard, and Related Product
D646 Test Method for Grammage of Paper and Paperboard (Mass Per Unit Area)
D685 Practice for Conditioning Paper and Paper Products for Testing
D1968 Terminology Relating to Paper and Paper Products
E122 Practice for Calculating Sample Size to Estimate, With Specified Precision, the Average for a Characteristic of a Lot or Process
E308 Practice for Computing the Colors of Objects by Using the CIE System
TAPPI StandardsT1206 Precision statement for test methods
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ASTM D589-97, Standard Test Method for Opacity of Paper (15°Diffuse Illuminant A, 89% Reflectance Backing and Paper Backing), ASTM International, West Conshohocken, PA, 1997, www.astm.orgBack to Top