Astm C11

Designation: C 11 – 03d

Standard Terminology Relating to

Gypsum and Related Building Materials and Systems1
This standard is issued under the fixed designation C 11; 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 superscriptepsilon (e) 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 2.1 ASTM Standards: 2 C 22/C 22M Standard Specification for Gypsum C 28/C 28MSpecification for Gypsum Plasters C 35 Specification for Inorganic Aggregates for Use in Gypsum Plaster C 36/C M Specification for Gypsum Wallboard C 37 Specification for Gypsum Lath C 52 Specification for Gypsum Partition Tile or Block3 C 59/C 59M Specification for Gypsum Casting and Molding Plaster C 61/C 61M Specification for Gypsum Keene’s Cement C 79/C 79M Specification for Treated Core and NontreatedCore Gypsum Sheathing Board C 317/C 317M Specification for Gypsum Concrete C 318/C 318M Specification for Gypsum Formboard C 472 Test Methods for Physical Testing of Gypsum, Gypsum Plasters and Gypsum Concrete C 473 Test Methods for Physical Testing of Gypsum Panel Products C 475/C 475M Specification for Joint Compound and Joint Tape for Finishing Gypsum Board C 557 Specification for Adhesives forFastening Gypsum Wallboard to Wood Framing C 587 Specification for Gypsum Veneer Plaster C 588/C 588M Specification for Gypsum Base for Veneer Plasters
1 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 Oct. 1, 2003.Published November 2003. Originally approved in 1916. Last previous edition approved in 2003 as C 11 – 03c. 2 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Annual Book of ASTM Standards volume information, refer to the standard’s Document Summary page on the ASTM website. 3 Withdrawn.

E 84 Test Method for Surface BurningCharacteristics of Building Materials E 96 Test Methods for Water Vapor Transmission of Materials E 119 Test Methods for Fire Tests of Building Construction and Materials E 337 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 thepurpose of forming corners, edges, control joints, or decorative effects. adhesive, n—a substance capable of holding materials together by surface attachment. 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 granularmaterial which may be added to gypsum plasters. (C 35) all purpose compound, n—a compound formulated and manufactured to serve as a taping or finishing compound, or both. anhydrite, n—the mineral consisting primarily of anhydrous calcium sulfate, CaSO4. 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).basecoat, n—the first layer or layers of plaster applied over lath or other substrate.
DISCUSSION—The first application is normally called a scratch coat and the second application is referred to as a brown coat.

bedding coat, n—that coat of plaster to receive aggregate or other decorative material of any size, impinged or embedded into its surface, before it sets. bond plaster, n—a calcined gypsum...