1.1 This specification covers the optical and aesthetic quality requirements for pyrolytic and vacuum deposition coatings applied on flat glass for use in building glazing.

1.2 The coatings are applied on the glass using either pyrolytic or vacuum sputtering deposition methods to control solar heat gain, energy performance, comfort level, and condensation and to enhance the aesthetic of the building.

1.3 This specification addresses blemishes related to the coating only. It does not address glass blemishes, applied ceramic frits to spandrel glass, and organic film opacifiers.

1.4 The Nonuniformity for Coated Glass requirements, given in 6.10, pertain to glazing units of vertical and sloped orientations as installed in the building exterior.

1.5 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.