ASTM C1326-13(2023)
Standard Test Method for Knoop Indentation Hardness of Advanced Ceramics
- Standard No.
- ASTM C1326-13(2023)
- Release Date
- 2023
- Published By
- American Society for Testing and Materials (ASTM)
- Latest
- ASTM C1326-13(2023)
- Scope
- 1.1 This test method covers the determination of the Knoop indentation hardness of advanced ceramics. In this test, a pointed, rhombic-based, pyramidal diamond indenter of prescribed shape is pressed into the surface of a ceramic with a predetermined force to produce a relatively small, permanent indentation. The surface projection of the long diagonal of the permanent indentation is measured using a light microscope. The length of the long diagonal and the applied force are used to calculate the Knoop hardness which represents the material’s resistance to penetration by the Knoop indenter. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 Units—When Knoop and Vickers hardness tests were developed, the force levels were specified in units of gramsforce (gf) and kilograms-force (kgf). This standard specifies the units of force and length in the International System of Units (SI); that is, force in newtons (N) and length in mm or µm. However, because of the historical precedent and continued common usage, force values in gf and kgf units are occasionally provided for information. This test method specifies that Knoop hardness be reported either in units of GPa or as a dimensionless Knoop hardness number. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
ASTM C1326-13(2023) Referenced Document
- ASTM C730 Standard Test Method for Knoop Indentation Hardness of Glass
- ASTM C849 Standard Test Method for Knoop Indentation Hardness of Ceramic Whitewares
- ASTM E177 Standard Practice for Use of the Terms Precision and Bias in ASTM Test Methods
- ASTM E384 Standard Test Method for Microindentation Hardness of Materials
- ASTM E4 Standard Practices for Force Verification of Testing Machines
- ASTM E691 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
- IEEE/ASTM SI 10 American National Standard for Metric Practice
- ISO 9385 Glass and glass-ceramics; Knoop hardness test
ASTM C1326-13(2023) history
- 2023 ASTM C1326-13(2023) Standard Test Method for Knoop Indentation Hardness of Advanced Ceramics
- 2013 ASTM C1326-13(2018) Standard Test Method for Knoop Indentation Hardness of Advanced Ceramics
- 2013 ASTM C1326-13 Standard Test Method for Knoop Indentation Hardness of Advanced Ceramics
- 2008 ASTM C1326-08e1 Standard Test Method for Knoop Indentation Hardness of Advanced Ceramics
- 2008 ASTM C1326-08 Standard Test Method for Knoop Indentation Hardness of Advanced Ceramics
- 2003 ASTM C1326-03 Standard Test Method for Knoop Indentation Hardness of Advanced Ceramics
- 1999 ASTM C1326-99 Standard Test Method for Knoop Indentation Hardness of Advanced Ceramics
