Skip to main content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.


The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Certification Report for SRM 2216, 2218, 2219: KLST (Miniaturized) Charpy V-Notch Impact Specimens



Enrico Lucon


This Certification Report documents the procedures used to develop certified values of maximum force (Fm) and absorbed energy (KV) for the following KLST-type miniaturized verification Charpy V-notch impact specimens: • SRM 2216 (low-energy level, Fm = 2.43 kN – KV = 1.59 J) • SRM 2218 (high-energy level, Fm = 1.78 kN – KV = 5.64 J) • SRM 2219 (super-high energy level, Fm = 1.79 kN – KV = 10.05 J). Certified values were obtained from the statistical analysis of an interlaboratory exercise (Round- Robin) conducted among nine international laboratories and coordinated by NIST. The KLST specimens tested in the Round-Robin were machined from previously tested (broken) standard Charpy V-notch verification specimens of low, high and super-high energy level. This report is intended to provide outside observers with accurate and detailed information on how the materials were certified and how the certification program was conducted. All certified values were established at room temperature (21 °C ± 3 °C). Full results of the statistical analyses conducted on the Round-Robin data are provided in this Report.
Special Publication (NIST SP) - 260-180
Report Number


Small specimens, miniaturized Charpy specimens, MCVN, indirect verification, small-scale impact testers, KLST, Round-Robin, instrumented Charpy testing.
Created July 23, 2013, Updated November 10, 2018