ASTM C1326-03

E691-23

Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method

C730-98(2021)

Standard Test Method for Knoop Indentation Hardness of Glass

C849-88(2025)

Standard Test Method for Knoop Indentation Hardness of Ceramic Whitewares

E4-24

Standard Practices for Force Calibration and Verification of Testing Machines

E177-26a

Standard Practice for Use of the Terms Precision and Bias in ASTM Test Methods (Includes all amendments and changes 5/14/2026).

E384-22

Standard Test Method for Microindentation Hardness of Materials

CEN ENV?843-4

Advanced Technical Ceramics, Monolithic Ceramics, Mechanical Properties at Room Temperature, Part 4: Vickers, Knoop, and Rockwell Superficial Hardness Tests Available from European Committee for Standardization (CEN), 36 rue de Stassart, B-1050, Brussels, Belgium, http://www.cenorm.be.

IEEE/ASTM?SI?10

Standard for Use of the International System of Units (SI) (The Modern Metric System)