ASTM_C_1381_-_C_1381M_-_97_2013.pdf

Designation:C1381/C1381M97(Reapproved 2013)Standard Specification forMolded Glass Fiber Reinforced Gypsum Parts1This standard is issued under the fixed designation C1381/C1381M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers molded glass fiber reinforcedgypsum(GRG)parts,which are nonload-bearing,thin-shell,ornamental shapes for architectural embellishment of interiorbuilding construction.1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.Within the text,theSI units are shown in brackets.The values stated in eachsystem may not be exact equivalents;therefore,each systemshall be used independently of the other.Combining valuesfrom the two systems may result in non-conformance with thestandard.1.3 The information presented refers to the molded surfaceof the part.1.4 The text of this standard references footnotes,whichprovide explanatory material.These footnotes shall not beconsidered as requirements of the standard.2.Referenced Documents2.1 ASTM Standards:2C11 Terminology Relating to Gypsum and Related BuildingMaterials and SystemsC1355/C1355M Specification for Glass Fiber ReinforcedGypsum Composites3.Terminology3.1 DefinitionsDefinitions of terms shall be in accordancewith Terminology C11.3.2 Definitions of Terms Specific to This Standard:3.2.1 control thickness,nthe thickness of the GRG partwhere abutting other GRG parts,other products or at fasteningpoints.3.2.2 embedments,nmaterials encapsulated into the partfor the purpose of suspension,attachment,and stiffening.3.2.3 finish surface,na surface against a mold.3.2.4 GRG part,nan individual molded component usedas architectural embellishment.3.2.5 GRG product,ncombination of GRG parts used asarchitectural embellishment.3.2.6 mock-up,na presentation assembly of GRG partsdefined by the purchase agreement.3.2.7 part thickness,nthickness of a part at any measure-ment point.4.Materials and Manufacture4.1 MaterialsGRG parts shall be produced using the samematerials used to make the composites in conformance withSpecification C1355/C1355M.4.2 Manufacture:4.2.1 GRG parts shall be manufactured from the mixedslurry of alpha gypsum cement,potable water and additives,when used,and not less than 5%by weight glass fiberreinforcement using either the hand lay-up or the spray-upprocess in a mold.4.2.2 GRG parts shall be produced according to approvedshop drawings.4.2.3 Shop drawings shall specify part dimensions,quantities,recommended attachment points and methods,reinforcements,embedments,and tolerance.5.Mechanical Properties5.1 GRG parts shall be made from materials to makecomposites having properties in accordance with SpecificationC1355/C1355M.6.Dimensions and Tolerances of GRG Parts6.1 Part ThicknessThe thickness of the GRG part shall benot less than316in.5 mm.6.2 Control Thickness,shall be not less than516in.8 mm.6.3 StraightnessAt any point on a line generally along aplane,an edge,or a surface,the molded side of the part shallnot vary from straight 618in.in 8 linear ft 1 mm in 750 mm.6.4 Dimensions,as specified in approved shop drawings,pertaining to the individual part.1This specification is under the jurisdiction of ASTM Committee C11 onGypsum and Related Building Materials and Systems and is the direct responsibilityof Subcommittee C11.01 on Specifications and Test Methods for Gypsum Products.Current edition approved June 1,2013.Published August 2013.Originallyapproved in 1998.Last previous edition approved in 2008 as C1381 97(2008)1.DOI:10.1520/C1381_C1381M-97R13.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.4.1 Overall Width,18in.3 mm.6.4.2 Dimensions Within the Overall Width,6116in.2mm.6.4.3 Overall Length,18in.3 mm.6.4.4 Dimensions Within the Overall Length,6116in.2mm.7.Workmanship,Finish,and Appearance7.1 GRG parts shall be produced to quality,tolerances,andsurface standards set within this specification.7.2 The standard finished surface shall be suitable to receiveflat paint.7.3 Finishes with sheen,direct light or special lightingconditions require additional coats of primer,sanding andfinishing by the installer or painter.8.Sampling8.1 When specified by the purchase agreement,samples ofthe GRG part shall be taken at the place of manufacture formeasuring in accordance with Section 6.8.2 Mock-UpWhen specified by the purchase agreement,a mock-up shall be supplied.9.Inspection9.1 Inspection of the GRG parts shall be agreed uponbetween the pu