ASTM_C_1355_-_C_1355M_-_96_2015.pdf

Designation:C1355/C1355M96(Reapproved 2015)Standard Specification forGlass Fiber Reinforced Gypsum Composites1This standard is issued under the fixed designation C1355/C1355M;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 glass fiber reinforced gypsum(GRG)composites having minimum properties and qualitysuitable to allow the production of GRG parts for non-loadingbearing,thin section,ornamental shapes for architecturalembellishment of interior building construction.1.2 The values stated in either inch-pound units or SI(metric)are to be regarded separately as standard.Within thetext,the SI units are shown in brackets.The values stated ineach system shall be independent of the other.Values from thetwo systems shall not be combined.1.3 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 SystemsC472 Test Methods for Physical Testing of Gypsum,Gyp-sum Plasters and Gypsum ConcreteC473 Test Methods for Physical Testing of Gypsum PanelProductsC947 Test Method for Flexural Properties of Thin-SectionGlass-Fiber-Reinforced Concrete(Using Simple BeamWith Third-Point Loading)D256 Test Methods for Determining the Izod PendulumImpact Resistance of PlasticsD578 Specification for Glass Fiber StrandsD696 Test Method for Coefficient of Linear Thermal Expan-sion of Plastics Between 30C and 30C with a VitreousSilica DilatometerD2583 Test Method for Indentation Hardness of Rigid Plas-tics by Means of a Barcol ImpressorE84 Test Method for Surface Burning Characteristics ofBuilding MaterialsE136 Test Method for Behavior of Materials in a VerticalTube Furnace at 750C3.Terminology3.1 Definitions:Definitions of terms shall be in accordancewith Terminology C11.3.2 Definitions of Terms Specific to This Standard:3.2.1 GRG composite,na thin section laminate made fromthe combination of alpha gypsum cement,glass fiber,additivesand water.3.2.2 GRG part,nan individual molded component usedas architectural embellishment.4.Materials and Manufacture4.1 Materials:4.1.1 Alpha Gypsum CementAlpha-calcium sulfatehemihydrate-plaster which is noncombustible,has a low waterdemand,neutral(pH)or low alkalinity,and a purity of not lessthan 90%by weight of CaSO42H2O.4.1.2“E”Glass FiberChopped glass fiber strands orcontinuous strand mats of calcia-alumina silicate glasses con-forming to Specification D578.4.1.3 WaterPotable water.4.1.4 AdditivesIn accordance with the alpha gypsum ce-ment manufacturers specifications.4.2 Manufacturers Certification of Raw Materials:4.2.1 Alpha Gypsum CementEach lot of alpha gypsumcement shall be certified to be in compliance with 4.1 and 5.1.4.2.2 Glass Fiber ReinforcementEach lot of glass fiberreinforcement shall be certified to be in compliance withSpecification D578.4.3 Composite Preparation:4.3.1 Prepare a flat,rectangular composite of sufficient sizeto obtain specimens required in 5.2.The composite preparedshall be the same formula as the intended GRG part.5.Mechanical Properties5.1 Neat Alpha Gypsum Cement:5.1.1 Normal Consistency shall be not more than 30 whentested in accordance with Test Methods C472.1This 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 Oct.1,2015.Published October 2015.Originallyapproved in 1996.Last previous addition approved in 2011 as C1355/C1355M 96(2011).DOI:10.1520/C1355_C1355M-96R15.2For 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 5.1.2 Compressive Strength shall be not less than 6000 psi(41.4 MPa)when tested in accordance with Test MethodsC472.5.1.3 Hardness shall be not less than 33 Barcol when testedin accordance with Test Method D2583.5.2 Composite:5.2.1 Specimen Preparation5.2.1.1 Flexural StrengthAverage Flexural Yield(FY)shall be not less than 1200 psi(8.3 MPa)and an averageFlexural Ultimate(FU)shall be not less than 2500 psi(17.2MPa)when tested in accordance with Test Method C947,usinga crosshead speed of 0.08 in./min(2 mm/min).Specimens shallbe conditioned to a constant weight in accordance with TestMethods C473.5.2.1.2 Impact ResistanceAverage impact resistance shallbe not less than 3 ft-lb(4 j)when tested in ac