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ASTM C318/C318M-24

Current Revision

Standard Specification for Gypsum Formboard

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1.1 This specification covers the minimum requirements for gypsum formboard designed for use as a permanent form for poured-in-place reinforced gypsum concrete roof decks.

1.2 The values stated in either inch-pound units or SI (metric) are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.

1.3 The text of this standard references notes and footnotes that provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard.

1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.5 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.


This specification covers the minimum requirements for gypsum formboard designed for use as a permanent form for poured-in-place reinforced gypsum concrete roof decks. Gypsum formboard shall consist of a noncombustible core, essentially gypsum, either mineral or organic, synthetic or natural. The face surface shall be specifically treated to resist fungus growth. Specimens shall be subjected to the following test methods: flexural strength; humidified deflection; core, end, and edge hardness; and resistance to fungi. Specimens shall be tested to determine thickness, width, length, end squareness, and edges and ends. The surfaces of gypsum formboard shall be true and free from imperfections that would render it unfit for use with or without decoration.


SDO ASTM: ASTM International
Document Number C318
Publication Date Oct. 1, 2024
Language en - English
Page Count 2
Revision Level 24
Supercedes
Committee C11.01
Publish Date Document Id Type View
Oct. 1, 2024 C0318_C0318M-24 Revision
Oct. 1, 2013 C0318_C0318M-13 Revision
July 10, 2000 C0318_C0318M-00E01 Revision
July 10, 2000 C0318_C0318M-00 Revision
Oct. 1, 2018 C0318_C0318M-13R18 Reaffirmation
Oct. 1, 2010 C0318_C0318M-00R10 Reaffirmation
May 1, 2005 C0318_C0318M-00R05 Reaffirmation