Standard Specification for Flat Glass

In architecture, glass serves integral practical and aesthetic purposes, acting as part of the building envelope and providing transparent barriers through which individuals inside can maintain a connection with the outside world. The benefits brought on by these features have long existed within the mindset of the buildings’ creators, as glass windows have been architectural components since the time of the Romans.

However, throughout most of history, glass windows were reserved for the wealthy and generally only provided limited visibility. Today, the demand placed on a window’s performance, just as with many other materials and products in our world, is elevated in comparison to that of the past, and there is an anticipated level of quality for the glass used in every building. ASTM C1036-16 – Standard Specification for Flat Glass, the latest revision of the standard that embeds quality into plate glass used for architectural glazing products, allows manufacturers to meet this demand.

This specification covers laboratory testing and field evaluation for annealed, monolithic flat soda-lime glass supplied as cut sizes or stock sheets. It covers the quality requirements of flat, transparent, clear, and tinted glass and is intended to be used primarily for coated glass, insulating glass units, laminated glass, mirrors, spandrel glass, or glazing products with similar uses.

The tests conducted through compliance with the ASTM C1036-16 – Standard Specification for Flat Glass standard exist mainly for the purpose of identifying any visibility issues through the flat glass tested, including those for evaluating blemishes, shell chips, ream, strings, lines, distortion, and solar/optical properties. These methods should also be used to determine the dimensions of the flat glass.

The glass tested is identified by its type, class, form, quality, and finish. There are two types of flat glass relevant: Type I (Transparent Flat Glass) and Type II (Patterned and Wired Flat Glass), which both can be of either Class 1 (Clear) or Class 2 (Tinted). The remainder of the characteristics can be divided into further divisions, each of which is meant to serve a different purpose relevant to their intended use.

As for marking, it is stated in ASTM C1036-16 – Standard Specification for Flat Glass that “each package of glass shall be identified by the manufacturer and include the manufacturer’s name or trademark, nominal thickness, glass description, date of manufacture or date of final packaging, and place of manufacture.”

ASTM C1036-16 – Standard Specification for Flat Glass is now available on the ANSI Webstore.

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