---
code: "ISO 148-1"
title: "Metallic materials — Charpy pendulum impact test"
institution: "ISO"
category: "impact-testing"
revision: "2016"
scope: "Specifies Charpy V-notch impact testing of metallic materials using a pendulum striker to measure absorbed energy, supporting toughness comparisons and quality verification of steels and cast products."
testMethod: "A notched bar is broken by a single pendulum blow; absorbed energy is reported from the machine indication, with requirements for machine verification, notch geometry, and test temperature."
specimenRequirements: "Standard full-size, sub-size, or reduced specimens may be used per annexes; notch preparation is critical. Specimen alignment in anvils and striker geometry compliance affect results; low-temperature tests require controlled baths."
url: "https://vectorbtc.com.tr/resources/standards/iso-148-1/"
---

Charpy energy is not a fundamental property; comparisons require consistent specimen type, notch, and temperature.