This standard specifies the method for testing hardness of auto steering-wheel with PU foam as the wrap layer material.
This standard is applicable to PU foam wrap layer materials for steering-wheels of passenger cars and commercial cars.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections), or revisions, of any of these publications do not apply to this standard. However parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition applies.
GB/T 2918 Plastics - Standard atmospheres for conditioning and testing
GB/T 8170 Rules for rounding off of numerical values
3 Term and definition
For the purpose of this standard, the following term and definition apply.
3.1
shore L hardness
shore L hardness refers to the hardness expressed by pressing a press needle with a specified shape into a specimen under standard spring pressure and converting the pressed depth of the press needle into a hardness value
4 Specimens
Two steering-wheels. The surface of the specimens must be free of air holes, foreign matters and other defects, and the outer surface must be closed. The production time of specimens shall be at least 3 d.
