ASTM_F_2468_-_05_2011.pdf

Designation:F246805(Reapproved 2011)Standard Classification forSpecifying Silicone Adhesives and Sealants forTransportation Applications1This standard is issued under the fixed designation F2468;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 classification covers silicone adhesives and seal-ants intended for but not limited to sealing and retainingmetallic and nonmetallic component assemblies in transporta-tion applications.The materials cure to an elastomeric state bytheir specified cure system and mechanism.NOTE1The classification system may serve many of the needs ofindustries using silicone materials.This classification is subject torevision,as the need requires;therefore,the latest revision should alwaysbe used.1.2 This classification is intended to be a means of classi-fying silicone materials.It is not intended for engineeringdesign purposes.1.3 It is not the intent of this classification to includepressure-sensitive or hot-melt adhesives.1.4 In all cases in which the provisions of this classificationsystem would conflict with the referenced ASTM standard fora particular method,the latter shall take precedence.1.5 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.6 The following safety hazards caveat pertains only to thetest methods portion,Section 7,of this classification.Thisstandard does not purport to address all of the safety concerns,if any,associated with its use.It is the responsibility of the userof this standard to establish appropriate safety and healthpractices and determine the applicability of regulatory limita-tions prior to use.2.Referenced Documents2.1 ASTM Standards:2C679 Test Method for Tack-Free Time of Elastomeric Seal-antsD149 Test Method for Dielectric Breakdown Voltage andDielectric Strength of Solid Electrical Insulating Materialsat Commercial Power FrequenciesD150 Test Methods for AC Loss Characteristics and Permit-tivity(Dielectric Constant)of Solid Electrical InsulationD257 Test Methods for DC Resistance or Conductance ofInsulating MaterialsD412 Test Methods for Vulcanized Rubber and Thermoplas-tic ElastomersTensionD471 Test Method for Rubber PropertyEffect of LiquidsD573 Test Method for RubberDeterioration in an AirOvenD618 Practice for Conditioning Plastics for TestingD624 Test Method for Tear Strength of Conventional Vul-canized Rubber and Thermoplastic ElastomersD792 Test Methods for Density and Specific Gravity(Rela-tive Density)of Plastics by DisplacementD907 Terminology of AdhesivesD1002 Test Method for Apparent Shear Strength of Single-Lap-Joint Adhesively Bonded Metal Specimens by Ten-sion Loading(Metal-to-Metal)D1053 Test Methods for Rubber PropertyStiffening atLow Temperatures:Flexible Polymers and Coated FabricsD1084 Test Methods for Viscosity of AdhesivesD1349 Practice for RubberStandard Temperatures forTestingD1415 Test Method for Rubber PropertyInternationalHardnessD1566 Terminology Relating to RubberD1898 Practice for Sampling of Plastics(Withdrawn 1998)3D2240 Test Method for Rubber PropertyDurometer Hard-nessD3182 Practice for RubberMaterials,Equipment,and Pro-cedures for Mixing Standard Compounds and PreparingStandard Vulcanized SheetsD4800 Guide for Classifying and Specifying Adhesives2.2 SAE Standard:41This classification is under the jurisdiction of ASTM Committee F03 onGaskets and is the direct responsibility of Subcommittee F03.30 on Classification.Current edition approved May 1,2011.Published July 2011.Originally approvedin 2005.Last previous edition approved in 2005 as F2468 05.DOI:10.1520/F2468-05R11.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.4Available from SAE International(SAE),400 Commonwealth Dr.,Warrendale,PA 15096-0001,http:/www.sae.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 SAE J369 Flammability of Polymeric Interior MaterialsHorizontal Test Method2.3 UL Standard:5UL 94 Flammability3.Terminology3.1 DefinitionsSome terms in this classification are de-fined in Terminiologies D907 and D1566.3.2 Definitions of Terms Specific to This Standard:3.2.1 cure mechanismthe method of initiating the cure fora silicone material.3.2.2 cure systemthe cross-linking mechanism the siliconematerial uses to transition to the elastomeric state.3.2.3 draw-downa method of sample preparation of vis-cous and sag-resistant sealants,in which the sealant is leveledusing a knife or tool to a specified th