ISO 9177-3:2022 PDF Download

A standard called ISO 9177-3:2022 concentrates on mechanical pencils used for technical drawings, and it speaks specifically to the black leads with HB hardness levels. The standard gives details on the bending strengths of these leads, which is a crucial detail to evaluate their robustness and breakage resistance.

A test procedure for determining the bending strength of HB leads is included in the standard. This test procedure enables producers, consumers, and regulatory organizations to impartially assess the strength of the leads and confirm that they adhere to the standards. The standard contributes to uniformity and quality in the manufacture and application of mechanical pencils for technical drawings by setting standardized bending strength values.

A standardized method for assessing the bending strength of HB leads, which are frequently used in mechanical pencils for technical drawings, is provided by ISO 9177-3:2022. Users can use this information to choose the best mechanical pencils for their needs in technical drawing, and manufacturers can use it to improve the quality of their leads.