Tissue paper and tissue products - Part 16: Determination of optical properties - Opacity (paper backing) - Diffuse reflectance method (ISO 12625-16:2015)
Edition 2015-09-23

Dentistry - Test Method for Determining Radio-Opacity of Materials (ISO 13116:2014)
Edition 2015-05-20

Standard Practice for Opacity Monitor Manufacturers to Certify Conformance with Design and Performance Specifications
Edition 2020

Standard Test Method for Determining the Opacity of a Plume in the Outdoor Ambient Atmosphere
Edition 2016

Road vehicles - Exhaust gas of diesel engine under free aceleration - Opacity determination
Edition 2001-03-30

Information technology - Automatic identification and data capture techniques - Effects of gloss and low substrate opacity on reading of bar code symbols
Edition 2014-03-01

Graphic technology. Visual opacity of printed white ink
Edition 2023-03-20

Dentistry - Test method for determining radio-opacity of materials
Edition 2020-09-29

Plastics pipes and fittings - Determination of opacity (ISO 7686:2005)
Edition 2006-03-08

OPACITY OF NON WOVENS CLOTHS
Edition 1982-03-15