ASTM C11-15a

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Designation: C11 − 15 C11 − 15a
Standard Terminology Relating to
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Gypsum and Related Building Materials and Systems
This standard is issued under the fixed designation C11; the number immediately following the designation indicates the year of original
adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope*
1.1 This standard covers terminology relating to gypsum and related building materials and systems. The terms are generically
defined. More specific and expanded definitions may appear in appropriate standards.
2. Referenced Documents
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2.1 ASTM Standards:
C22/C22M Specification for Gypsum
C28/C28M Specification for Gypsum Plasters
C35 Specification for Inorganic Aggregates for Use in Gypsum Plaster
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C36/C36M Specification for Gypsum Wallboard (Withdrawn 2004)
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C37/C37M Specification for Gypsum Lath (Withdrawn 2004)
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C52 Specification for Gypsum Partition Tile Or Block (Withdrawn 1982)
C59/C59M Specification for Gypsum Casting Plaster and Gypsum Molding Plaster
C61/C61M Specification for Gypsum Keene’s Cement
C317/C317M Specification for Gypsum Concrete
C318/C318M Specification for Gypsum Formboard
C472 Test Methods for Physical Testing of Gypsum, Gypsum Plasters and Gypsum Concrete
C473 Test Methods for Physical Testing of Gypsum Panel Products
C475/C475M Specification for Joint Compound and Joint Tape for Finishing Gypsum Board
C843 Specification for Application of Gypsum Veneer Plaster
C557 Specification for Adhesives for Fastening Gypsum Wallboard to Wood Framing
C587 Specification for Gypsum Veneer Plaster
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C588/C588M Specification for Gypsum Base for Veneer Plasters (Withdrawn 2005)
C954 Specification for Steel Drill Screws for the Application of Gypsum Panel Products or Metal Plaster Bases to Steel Studs
from 0.033 in. (0.84 mm) to 0.112 in. (2.84 mm) in Thickness
C1007 Specification for Installation of Load Bearing (Transverse and Axial) Steel Studs and Related Accessories
C1396/C1396M Specification for Gypsum Board
E84 Test Method for Surface Burning Characteristics of Building Materials
E96/E96M Test Methods for Water Vapor Transmission of Materials
E119 Test Methods for Fire Tests of Building Construction and Materials
E337 Test Method for Measuring Humidity with a Psychrometer (the Measurement of Wet- and Dry-Bulb Temperatures)
3. Terminology
accelerator, n—a material that reduces setting time.
accessories, n—products fabricated for the purpose of forming corners, edges, control joints, or decorative effects.
adhesive, n—a substance capable of holding materials together by surface attachment.
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This terminology is under the jurisdiction of ASTM Committee C11 on Gypsum and Related Building Materials and Systems and is the direct responsibility of
Subcommittee C11.91 on Terminology and Editorial.
Current edition approved April 1, 2015Oct. 1, 2015. Published April 2015October 2015. Originally approved in 1916. Last previous edition approved in 20132015 as
C11 – 13.C11 – 15. DOI: 10.1520/C0011-15.10.1520/C0011-15A.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
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The last approved version of this historical standard is referenced on www.astm.org.
*A Summary of Changes section appears at the end of this standard
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C11 − 15a
admixture, n—a material other than water, aggregates, hydraulic cementitious material, and fiber reinforcement that is used as an
ingredient to modify properties and is added to the batch before or during its mixture.
aggregate, n—an inert granular material which may be added to gypsum plasters. (C35)
all purpose compound, n—a compound formulated and manufactured to serve as both a taping and a finishing compound.
anhydrite, n—the mineral consisting primarily of anhydrous calcium sulfate, CaSO .
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arris (of an arch), n—the outside corner or angle formed by the meeting of a wall surface with the curved surface of an arch (see
Fig. 1).
base coat, n—any or all layers of plaster in place prior to application of finish coats.
DISCUSSION—
The first application is normally called a scratch coat and the second application is referred
...