---
code: "ASTM E23"
title: "Standard test methods for notched bar impact testing of metallic materials"
institution: "ASTM"
category: "impact-testing"
revision: "2023"
scope: "Describes notched-bar impact tests (Charpy and Izod configurations as applicable) for metallic materials, including machine checks, specimen requirements, and reporting used in North American material specifications."
testMethod: "A notched specimen is fractured by a pendulum; absorbed energy is determined from the machine scale or encoder system with defined procedures for alignment, lubrication (if applicable), and verification specimens."
specimenRequirements: "Notch location and geometry must meet E23 tolerances; specimen seating on anvils is critical. Temperature conditioning and transfer time limits apply for tests below or above ambient conditions."
url: "https://vectorbtc.com.tr/resources/standards/astm-e23/"
---

ASTM E23 and ISO 148 share similar physics but differ in procedural details and specimen naming conventions.