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STANDARD SPECIFICATIONS AND TOLERANCES POR 23/5/3 CARDED AMERICAN TiRE CORD1 A.S.T.M Designation: D 298- 29 These specifications are is5uL-d 'unctcr the fixed designation D 298; the Cinnl number indicates the year of original adoption as stnndnrd or, in the case ol 1·evision, the year of -Inst revision lssuuo A!! T1tNTAT1vn, 1928; Aoot'11iD, 192.9 1 These specifications are intended to cover the requirements Scope of a tire cord of 23/5/3 construction made from carded American cotton The tolerances of these specifications are bused on the tolerances in the Standard Specifications for Tolerances ·and Test Methods for Tire Cord, Woven and on Cones (A.S.T.M Designation : D 179) of the American Society for Testing Materials.~ NOTE.-lt is recognized that mWlufncturers and consumer:i each have their own theories as to certain cluiractcristics which the cord shou~d have but U1ese specitica· tions are offered a9 a standard for those seeking a general a ll-around ~rd of this type 2 The cord shall be that known in the trade as 23/5/3 construe- Conatructton Cotton tion The actual size of the single yarn shall be so adjusted as to Put-up · give the finished size of cord specified 3 These specifications arc based on cord made from American Middling cotton of good hard character with a staple length of I h in Ya.ms shall be single carded 4 The cord shall be wound on cones to the dimensions and yardage specified in the purchase contract, or if woven into tire- cord fabric shall conform to the contract specifications PROPERTIES 5 The average tensile strength of the cord, conditioned, ns Tea11Jo determined by test shall not be less than 15.0 lb Suon1th 6 The average elongation or stretch of the cord, conditioned, as Blon1at1on determined by test, taken at the IO-lb load shall be 12.5 per cent in the case of cord on cones and 14.0 per cent in the case of cord from fabrics, subject to a pem1issiblc variation of plus or minus 10 per cent 1 Uader tho 1!4odardl tJon proc:edure of t he Society, thDlll apodficat:ioaa are undet the juriadiction of the A.S.T.M Committco D· IJ on Tcstilo Ma terlals I Sea p JOSS (1079) 1080 SPECIFICATIONS FOR CARDED AMERICAN TIRE CORD Size or (not less than 11.25 nor more than 13.75 per cent in the case of cord Yardage on cones, and not less than 12.6 nor more than 15.4 per cent in the case of cord from fabrics) Thickness (Gage) 7 The average size of the cord, conditioned, as determined by Twist test shall be l.25, or the yardage per pound, subject to a permissible variation of plus or minus 3.0 per cent (average not less than 1018 nor more than 1082 yd per lb.), shall be 1050 yd per lb 8 The average thickness or gage of the cord, as determined by test shall be 0.033 in., subject to a permissible variatioµ of plus or minus 3.5 per cent (not less than 0.032 nor more than 0.034 in.) 9 (a) The single yarn shall be spun with right-hand twist, with a twist multiple of four times the square root of the actual single yarn size (b) The forming twist of the 23/5 ply cord shall be right hand in direction and shall be made with 18 turns per inch subject to a per- missible variation of plus or minus 5 per cent (not less than 17.0 nor more than 19.0 turns per inch) (c) The final twist of the 23/5/3 ply cord shall be left hand in direction and shall be made with 8 turns per inch subject to a per- missible variation of plus or minus 4 per cent (not less than 7.7 nor more than 8.3 turns per inch) NOTE.-Direction of twist is defined in the Standard Definitions of Terms Relating to Textile Materials (A.S.T.M Designation: D 123) of the American Society for Testing Materials.1 METHODS OF TESTING Methods ol 10 All tests shall be in accordance with the methods of testing Testing prescribed in the Standard Specifications for Tolerances and Test Methods for Tire Cord, Woven and on Cones (A.S.T.M Designation: D 179) of the American Society for Testing Materials.2 •Seep.1107 •See p 1085