ASTM C 1658/C1658M : 2018

1.1 This specification covers the glass mat gypsum panelsdescribed in 1.1.1 – 1.1.3.1.1.1 Glass mat interior gypsum panel, designed for use onwalls, ceilings, or partitions and that affords a surface suitableto receive decoration.1.1.2 Glass mat coreboard gypsum panel, and glass matshaftliner gypsum panel, designed for use as a base inmultilayer systems or as gypsum studs or cores in semisolid orsolid gypsum board partitions, or in shaftwall assemblies.1.1.3 Glass mat water-resistant gypsum panel, designed tobe used as a base for the application of ceramic or plastic tileon walls or ceilings. This product is also suitable for decoration.(This is distinct from a coated glass mat water-resistantgypsum panel ASTM 1178.)1.2 Specifications applicable to all glass mat gypsum panelsare located in Sections 1 – 4 and 8 – 10. Specificationsapplicable to specific glass mat gypsum panels are located inthe following sections:SectionGlass mat interior gypsum panel 5Glass mat coreboard gypsum panel, and glassmat shaftliner gypsum panel6Glass mat water-resistant gypsum panel 71.3 The values stated in either inch-pound units or SI(metric) are to be regarded separately as standard. Within thetext, the SI units are shown in brackets. The values stated ineach system shall be used independent of the other. Valuesfrom the two systems shall not be combined.1.4 This international standard was developed in accordancewith internationally recognized principles on standardizationestablished in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendationsissued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee