ASTM_D_2692_-_D_2692M_-_15.pdf

Designation:D2692/D2692M15Standard Test Method forAir Permeability of Tire Fabrics,Tire Cord Fabrics,TireCord,and Yarns1This standard is issued under the fixed designation D2692/D2692M;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 test method covers the determination of longitudi-nal air permeability for tire fabrics,tire cord fabrics,tire cords,or yarns embedded in cured rubber compound.This testmethod is designed to demonstrate the effectiveness of fabrictreatments intended to prevent air permeability.This testmethod is applicable to fabrics made from all types of fiberswith all types of rubber compound.1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.See the Note in11.1.2.Referenced Documents2.1 ASTM Standards:2D123 Terminology Relating to TextilesD3182 Practice for RubberMaterials,Equipment,and Pro-cedures for Mixing Standard Compounds and PreparingStandard Vulcanized SheetsD6477 Terminology Relating to Tire Cord,Bead Wire,HoseReinforcing Wire,and Fabrics3.Terminology3.1 Definitions:3.1.1 For definitions of terms relating to tire cord,bead wire,hose wire,and tire cord fabrics,refer to Terminology D6477.3.1.1.1 The following terms are relevant to this standard:airpermeability,chafer fabric,test panel,in air permeability test,tire cord,tire cord fabric,tire fabric,vulcanization,wickproof,in tire fabric,tire cord fabric,tire cord,or yarn.3.1.2 For definitions of other terms related to textiles,referto Terminology D123.3.1.2.1 The following terms are relevant to this standard:skein and yarn.4.Summary of Test Method4.1 Fabric specimens are embedded in a rubber compoundand air pressure is applied to freshly exposed yarn ends.Detergent solution is applied to the opposite end of the yarnswhich have also been freshly exposed.Air permeability isindicated by continuous formation of air bubbles in thedetergent solution due to air passing along the axis of a yarn.5.Significance and Use5.1 This test method is considered satisfactory for theacceptance testing of commercial shipments of tire fabricssince this test method has been used extensively in the trade foracceptance testing.This test method is also considered satis-factory for quality control.5.1.1 In case of a dispute arising from differences inreported test results when using this test method for acceptancetesting of commercial shipments,the purchaser and the sup-plier should conduct comparative tests to determine if there isa statistical bias between their laboratories.Competent statis-tical assistance is recommended for the investigation of bias.As a minimum,the two parties should take a group of testspecimens that are as homogeneous as possible and that arefrom a lot of material of the type in question.The testspecimens should then be randomly assigned in equal numbersto each laboratory for testing.The average results from the twolaboratories may be compared using appropriate statisticalanalysis and an acceptable probability level chosen by the twoparties before the testing is begun.If a bias is found,either itscause must be found and corrected or the purchaser and thesupplier must agree to interpret future test results with consid-eration to the known bias.1This test method is under the jurisdiction ofASTM Committee D13 on Textilesand is the direct responsibility of Subcommittee D13.19 on Industrial Fibers andMetallic Reinforcements.Current edition approved Feb.1,2015.Published April 2015.Originallyapproved in 1968.Last previous edition approved in 2014 as D2692 10(2014).DOI:10.1520/D2692_D2692M-15.2For 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 5.2 This test method is applicable for testing the air perme-ability of any fabric that is embedded in a rubber compound,but is particularly useful when testing chafer fabrics to be usedin a tubeless tire construction.In tubeless tires,chafer fabricyarns that are air permeable represent potential channels for airto pass through,and thu