ICS 83.160.10 G 41 HG RecordNo.:34510-2012 Chemical Industry Standard of the People' s Republic of China HG/T2177—2011 Replace HG/T 2177-1998 Appearance quality of tyres 轮胎外观质量 (Eng/ishTrans/ation) Issuedate:202X-XX-XX Implementationdate:202X-XX-XX Ministry of Industry and Information Technology of the People's Republic of Issued by China HG/T2177—2011 Foreword SAc/Tc 19 is in charge of this English translation. In case of any doubt about the contents of the English translation, the Chinese original shall be considered authoritative. This standard is drafted in accordance with the rules given in GB/T 1.1—2009Directives for standardizationPart 1:Structure anddrafting of standards. This Standard replaces the HG/T 2177-1998Appearance qua/ity of tyres in whole The following technical revisions have beenmade with respect to the HG/T 2177-1998 Appearance quality of tyres. Modified the adopted standard (Chapter 2 in version-1998; chapter 2 in this version); Modified the thickness of crown circumferential flashing of radial tyre(the Table 1,1 in version-1998; Table 1,1 in this version); Modified the crown circumferential channeling depth of radial tyre(the Table 1, 2 in version-1998; Table 1,2 in this version); Modified the mold edge misalignment height of crown (the Table 1, 3 in version-1998; Table 1,3 in this version); -Modified thebasethickness of radial tyremold seamflashing (Table1,5 inversion-1998 Table 1,5、6in this version); Modifiedthe stepwidthof radial tyre(Table1,6 in version-1998; Table 1,7 in this version); Table 1,8 in this version); Modified the roughness depth and height inside the bead(Table 1, 12 in version-1998; Table 1,13in this version); - Modified the height and depth of exposed cord in bead lateral, wrinkled buckled or torn chafer, repeat skin-rubber sheet, cracking(Table 1,13 in version-1998; Table 1,14 in this version); Modified the thickness of bead toe edge of radial tyre(Table 1,15 in version-1998;Table 1,16 in this version); Modified the number of split cords in radial tyre(Table1,17 in version-1998;Table 1,18 in this version); I HG/T 2177—2011 Modified and added the depth and height of the roughness on tyre(Table 1, 20 in version-1998 Table 1,20 in this version); Listed the open splice and stamping of foreign matter in a separate column and modified the defect depth (Table 1,20 in version-1998; Table 1,21 in this version); Listed the exposed cords in tyre cavity in a separate column (Table 1,20 in version-1998; Table 1,22 in this version); Added the number of blister of tubeless motorcycle tyre(Table 2 in this version) ; Added the ratio of uneven bead width of tubeless tyre(Table 2 in this version) This standard was proposed by China Petroleum and Chemical Industry Federation This standard was prepared by SAc/TC19 National Technical Committee on Tyres and Rims of Standardization Administration of China. The previous edition replaced by this Standard is as follows: HG/T 2177-1998. II HG/T2177—2011 Appearance quality of tyres 1. Scope This standard specifies the requirements for the appearance quality of tyres. This standard is applicable to pneumatic tyres for trucks, passenger cars, earthmovers. industrial vehicles, agricultural machinery and motorcycles, together with tyres and flaps of solid tyres for pneumatic tyre rims and pressed-on solid tyres. 2.NormativeReferences The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T6326,Tyretermsand definitions 3. Terms and Definitions For the purposes of this document, the terms and definitions given in GB/T 6326 apply 4.Requirements 4.1 The appearance quality of tyres shall comply with provisions in Table 1 to Table 3; the flap shall comply with provisions in Table 4. 4.2 The appearance quality of tyres is allowed to be re-evaluated after its defects have