This international standard was developed in accordance with internationally recognized principles on standardization establishedin the Decision on Principles for the Development of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers o Trade(TBT)Committee. Designation:F2466-10(Reapproved 2024) INTERNATIONAL Standard Practice for Determining Silicone Volatiles sin Silicone Rubber for Transportation Applications1 This standard is issued under the fixed designation F2466;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. 1.Scope 'This practice is under the jurisdiction of ASTM Committee F03 on Gaskets and is the direct responsibility of Subcommittee F03.50 on Analytical Test 1.1 This practice covers a means to determine the percent Methods. silicone-producing volatiles present in heat-cured silicone Current edition approved Sept.1,2024.Published September rubber and room temperature-cured silicones(RTV). 2024.Originally approved in 2005.Last previous edition approved in 2018 as F2466-10(2018). DOI:10.1520/F2466-10R24. 1.2 Silicone-producing volatiles contribute to fouling of oxygen sensor systems used in the control of vehicle emis- 2For referenced ASTM standards,visit the ASTM sions. website,www.astm.org,or contact ASTM Customer Service at www.astm.org/contact.For Annual Book of ASTM Standards volume 1.3 This standard does not purport to address all of the information,refer to the standard's Document Summary page on the ASTM website. safety concerns,if any,associated with its use.It is the responsibility of the user ofthis standard to establish appro- priate safety,health,and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.4 This international standard was developed in accor dance with internationally recognized principles on standard- izationestablishedintheDecisiononPrinciplesforthe Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee. 2.Referenced Documents 2.1 ASTM Standards:2 D3182 Practice for Rubber—Materials,Equipment,and Pro- cedures for Mixing Standard Compounds and Preparing Standard Vulcanized Sheets E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method 3.Summary of Practice 3.1 This practice consists of four(4)basic steps:(1)the silicone is cured to its elastomeric form,(2)the volatiles are extracted from the cured material,(3)the extract is separated resolution,particularly separation of the internal standard from and measured by gas chromatography(GC),and (4)the GC extracted sample components. results are quantified using a siloxane calibration. 5.2 Column,suggested to be used is 30 to 60 m by 0.25 mm 4.Significance and Use 4.1 Use of this practice in conjunction with realistic maxi- column or equivalent. mumvolatilitytolerancelevelcanhelpminimizetheriskof 5.3 Operating conditions are: oxygen sensor dysfunction from formed-in-place-sealants in transportation applications.This practice provides a method for 5.3.1 Column-50 to 320℃ at 10C/min (a post-analysis determination of percentage volatiles in silicone elastomers. period may be required to elute higher boiling components The volatile silicones from a commercial silicone are primarily prior to subsequent analyses). cyclo dimethyl-siloxane.Other species present having GC 5.3.2 Injector-290 ℃. retentiontimes similartothoseofthecyclics areassumedtobe silicone as well. 5.3.3 Detector-325 ℃. 5.3.4 Sample Size-1 μL. 5.Apparatus 5.1 Gas Chromatograph,fused silica capillary column sys- tem equipped with a flam