TS ISO 9177-3
Mechanical Pencils-Part 3-Black leads-Bending strengths of HB leads
This standard specifies bending strengths and a test method for black leads of his hardness degree used for mechanical pencils for technical drawings.
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About This Item
TS ISO 9177-3 addresses the bending strength of black HB leads used in mechanical pencils for technical drawings, together with the test method used to assess that bending strength. In practical terms, it focuses on the mechanical behaviour of the lead itself rather than the pencil body, helping define how the lead responds to bending loads before breaking.
Why bending strength matters for HB leads
HB is a commonly used lead grade that sits near the middle of the hardness scale, balancing darker marking with reasonable resistance to wear. Bending strength is about how much the lead can flex under load and how resistant it is to fracture. For drafting and other precision drawing tasks, this characteristic affects line continuity, breakage frequency and overall consistency in use.
What this standard covers
- Bending strength values for black mechanical pencil leads of HB hardness grade.
- A test method for determining that bending strength.
- Leads intended for use in mechanical pencils for technical drawings.
- The standard is concerned with mechanical performance assessment rather than the general design of the pencil.
In general technical context, pencil leads are composite products based on graphite and binders, so hardness grade is closely tied to formulation and in-use behaviour. This standard is therefore useful for comparing lead performance where drafting reliability matters. The listing refers to the TS ISO 9177-3:1997 edition and it has since been withdrawn.
- Publication Date: 18.03.1997
- Standard Status: H (İptal Edilmiş Standard/Withdrawn standard)
- Publisher: TSE
- Document Language: tr
- ICS Classification: 01.100.40 Çizim Ekipmanları; 97.180 Çeşitli Ev Ekipmanları,
- Pages: 5
- Source Standard: ISO 9177-3:1994
- International Equivalents: ISO 9177-3 (1994)--; NF E04-707-3* NF ISO 9177-3--; DIN ISO 9177-3--; ISO 9177-3:1994--
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