tailieunhanh - Designation: C 442/C 442M – 99a - Gypsum Backing Board, Gypsum Coreboard, and Gypsum Shaftliner Board1

This standard is issued under the fixed designation C 442/C 442M; 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 (e) indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the Department of Defense. | ij Designation C 442 C 442M - 99a Standard Specification for Gypsum Backing Board Gypsum Coreboard and Gypsum Shaftliner Board 1 This standard is issued under the fixed designation c U2 C 442M 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 e indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the Department of Defense. 1. Scope This specification covcrr gypsum board deigned to be used as a base in multilayer systems as a gypsum stud or core in semi-solid or solid gypsum board partitions or in shaftwall assemblies. The values stated in inch-pound units are to be regarded as standard. Within the text the SI units are shown in brackets. The values stated in each system shal be used independent of the other. Values from the two systems shall not be combined. The terms backing board. ooscOrard. and sfaftlincr board refer to different end uses of the gypsum board specified in tins ị psum backing board in this speciClcaiion. shall include gypsum coreboard and gypsum shaftliner board unless otherwise stated. The text of this speciCcation references notes and footnotes which provide explanatory material. These notes and footnotes excluding those in tables and cgures shall not be considered as requirements of the speciCcation. 2. Referenced Documents ASTM Standards C 11 Terminology Relating to Gypsum and Related Building Materials and Systems2 C 36 SpeciCcation for Gypsum Wallboard2 C 473 Test Methods for Physical Testing of Gypsum Panel Products2 C 645 SpeciCcalion for Non-Load Bearing Axiifi Sted Studs Runners Tracks and Rigid Furring Channels for Screw Application of Gypsum Board2 C 1264 C 1264M SpeciCcation for Sampling. 11 00000. Rejection CertiCcation Packaging. Marking. .