ASTM C1395 – Specification for Gypsum Ceiling Board
This specification covers 1/2 in. [12.7 mm] thick gypsum ceiling board designed for use on interior ceilings with framing spaced not more than 24 in. [610 mm] on center and that affords a surface suitable to receive water-based texture and other decoration. This product is also suitable for use on interior walls.
ceiling; drywall; gypsum; gypsum board; gypsum ceiling board; gypsum wallboard; type X