SAFEGUARDS | SoftlinesNO. 158/21
On August 20, 2021 Administration of market supervision and Standardization Administration of the PRC issued shanks for footwear product standard GB/T 28011-2021 which becomes effective on March 01, 2022. GB/T 28011-2021 replaces previous edition GB/T 28011-2011.
The new standard is applicable to metal and non-metal shanks for footwear sizes ≥200, including boots. The standard is not applicable to shanks made of wood or other similar materials.
Main Technical Changes
The main modifications between GB/T 28011-2021 and GB/T 28011-2011:
- the title of standard
- the “scope”;
- added the definitions of “Type I shank” “Type L shank” “Type Y shank”;
- the product classification;
- the requirements for “Marking”;
- the requirements for “Appearance quality”;
- the requirements for “Longitudinal stiffness”;
- the requirements for “Fatigue resistance”;
- the requirements for “Hardness”;
- the requirements for “Bending resistance”;
- added the length measurement figure for “Type I shank” “Type L shank” “Type Y shank”;
- the test method of “Bending resistance”;
- the method of “Judgment of result”.
|1||Marking||The suitable effective heel height or range of the effective suitable heel heights shall be marked on shank. Unit: mm.
If the shank is taken out from finished shoe, no need to inspect the marking.
|2||Appearance quality||The surface of shank shall be free of burr, rust, crack, bending deformation, smooth and flat. The bars, nail holes and forks shall be installed on correct positions.
|3||Size Shanks||Comply with GB/T 28011-2021, 5.3
|4||Longitudinal Stiffness||Comply with GB/T 28011-2021, 5.4, Table 3 for metal shanks;
For non-metal shank, comply with requirements below:
|Effective heel heights (mm)
||< 30||30 (includes) ~40||40 (includes) ~50
|Longitudinal Stiffness (KN•mm2)||≥ 260||≥ 350||≥ 450||--|
||Comply with GB/T 28011-2021, 5.5, Table 4 for metal shanks.
Non-metal shank needs not to be tested.
||Comply with GB/T 28011-2021, 5.6, Table 5 for metal shanks.
Requirements of non-metal shank: ≥75 Shore D
|7||Bending Resistance||The metal shank shall be subjected to the 180°bending test without breaking.
Non-metal shank needs not to be tested.
- GB/T 28011-2011 <Shanks for footwear> is applicable to metal shanks.
- GB/T 28011-2021 <Shanks for footwear> is applicable to metal shanks and non-metal shanks, and not applicable to shanks made by wooden or other similar materials.
Details of the Technical Content
For more information, please refer to the standard GB/T 28011-2021 <Shanks for footwear> or contact SGS directly.
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