ASTM_C_631_-_09_2014.pdf

Designation:C63109(Reapproved 2014)Standard Specification forBonding Compounds for Interior Gypsum Plastering1This standard is issued under the fixed designation C631;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers minimum requirements forbonding compounds for adhering interior gypsum plaster tostructurally sound surfaces.1.2 This specification also covers test methods for determin-ing performance requirements and physical properties.1.3 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.4 The following safety hazards caveat pertains only to thetest methods described in this specification:This standard doesnot purport to address all of the safety concerns,if any,associated with its use.It is the responsibility of the user of thisstandard to establish appropriate safety and health practicesand determine the applicability of regulatory limitations priorto use.2.Referenced Documents2.1 ASTM Standards:2C11 Terminology Relating to Gypsum and Related BuildingMaterials and SystemsC28/C28M Specification for Gypsum PlastersC472 Test Methods for Physical Testing of Gypsum,Gyp-sum Plasters and Gypsum ConcreteC511 Specification for Mixing Rooms,Moist Cabinets,Moist Rooms,and Water Storage Tanks Used in theTesting of Hydraulic Cements and Concretes3.Terminology3.1 DefinitionsFor definitions relating to gypsum andrelated building materials and systems,see Terminology C11.4.Physical Properties4.1 GeneralThe bonding compound shall be a filmforming,non-oxidizing,non-toxic,non-flammable composi-tion suitable for application by brush,roller,and spray.Thecompound shall be tinted to show,by visual inspection,whereit has been applied.The tinting material shall not show throughthe material being bonded.The surfaces to which bondingcompounds are applied shall be relatively smooth,clean,anddry.Surface coatings shall be removed if their nature indicatesan unsatisfactory condition.Surfaces shall be prepared inaccordance with the manufacturers directions.4.2 ConsistencyThe bonding compound shall be of ahomogeneous nature with no settling of the solids.Thecompound shall be free of foreign matter,and when applied inaccordance with the manufacturers directions,shall coverevenly.4.3 Film CharacteristicsA dry film of the bonding com-pound shall be uniform and smooth and shall remain flexible.The film shall not be noticeably affected by mild acid or alkali.5.Performance Requirements5.1 Bonding CapabilityA dry film of bonding compoundshall be capable of bonding gypsum plaster immediately afterdrying and 10 days after drying when tested as specified inSection 12.5.2 DegradationBonding compound that separates shallbe able to be re-mixed to a uniform consistency when tested asspecified in Section 10.5.3 High Temperature StabilityThe bond strength shall benot less than 20 psi(138 kPa)when tested as specified inSection 9.5.4 Freeze-Thaw StabilityThe bond strength shall be notless than 20 psi(138 kPa)when tested as specified in Section11.5.5 Bond StrengthBond strength of a fresh sample or a30-day-old sample shall be not less than 20 psi(138 kPa)whentested as specified in Section 12.6.Sampling6.1 Take a sample of not less than 1 kg from each shipmentor consignment for analysis and tests.Except in special cases,take the sample from not less than three separate containers,1This specification is under the jurisdiction of ASTM Committee C11 onGypsum and Related Building Materials and Systems and is the direct responsibilityof Subcommittee C11.02 on Specifications and Test Methods for Accessories andRelated Products.Current edition approved Sept.1,2014.Published October 2014.Originallyapproved in 1988.Last previous edition approved in 2009 as C631 09.DOI:10.1520/C0631-09R14.2For 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 chosen at random.In addition,take samples from containersthat appear to be nonrepresentative,and test separately.Imme-diately place the samples in airtight glass containers andtransport to the testing laboratory in these containers.Takeprecautions to reduce evaporation or drying to a minimum.Thoroughly mix the bonding compound in the container ifthere is a tendency for liquid phase separation.7.Apparatus7.1 Moist CabinetSpecification C511.7.2 OvenA forced draft type oven,having a temperaturecontrolled at 140 6 5