ISO 180:2023
Plastics. Determination of Izod impact strength

Standard No.

ISO 180:2023

Release Date

2023

Published By

International Organization for Standardization (ISO)  IX  /  ISO

Latest

ISO 180:2023

Introduction

Analysis of the core content of the standard

Test parameters	Non-notched specimen	Type A notch	Type B notch
Notch radius (mm)	-	0.25±0.05	1.00±0.05
Remaining width (mm)	10.0±0.2	8.0±0.2	8.0±0.2
Typical application materials	Thermoplastic Sheet	General Evaluation	Notch Sensitivity Study

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Key Technical Requirements

1. Test Equipment Specifications

The impact tester must comply with ISO 13802 verification requirements. Key points to note:

• Pendulum Energy Selection: The energy absorbed by the specimen should be in the range of 10%-80% of the available energy
• Clamping Force Control: For pressure sensitive materials, a torque wrench or pneumatic device should be used to standardize the clamping force
• Impact Velocity: The standard specifies 3.5m/s (to be stated in the report)

2. Specimen Preparation Tips

Injection Molded Specimens should refer to ISO 294-1 standard, special attention:

• Multi-cavity molds need to ensure the consistency of the size of the specimens in each cavity
• Notch processing should preferably be mechanical processing (in line with ISO 2818)
• The specimen surface must not have defects such as scratches and dents

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Standard Update Highlights

Main revisions of the 2023 version:

1. Added inter-laboratory comparison data for unnotched specimens (see Appendix A)
2. Added reference to ISO 16012 standard (specimen size measurement)
3. Updated the symbol system in the calculation formula
4. Revised the method identification rules in Chapter 10

Implementation recommendations

Material applicability strategy

Material type	Recommended specimen	Special requirements
Long fiber reinforced materials	No notch	Test direction needs to be indicated
Thermotropic liquid crystal polymer	No notch	Controlled clamping pressure
Laminated sheets	Notched type A	10 specimens in parallel/vertical directions

Test result processing

Report classified according to fracture type:

• Type C: Complete fracture (including hinge fracture)
• Type P: Partial fracture
• Type N: No fracture

When the coefficient of variation is <5%, the minimum number of samples can be reduced to 5

ISO 180:2023 Referenced Document

• ISO 10724-1 Plastics - Injection moulding of test specimens of thermosetting powder moulding compounds (PMCs) - Part 1: General principles and moulding of multipurpose test specimens
• ISO 13802 Plastics - Verification of pendulum impact-testing machines - Charpy, Izod and tensile impact-testing*， 2025-08-13 Update
• ISO 2818 Plastics — Preparation of test specimens by machining
• ISO 291 Plastics - Standard atmospheres for conditioning and testing
• ISO 293 Plastics — Compression moulding of test specimens of thermoplastic materials
• ISO 294-1 Plastics - Injection moulding of test specimens of thermoplastic materials - Part 1: General principles, and moulding of multipurpose and bar test specimens
• ISO 295 Plastics - Compression moulding of test specimens of thermosetting materials

ISO 180:2023 history

• 2023 ISO 180:2023 Plastics. Determination of Izod impact strength
• 2019 ISO 180:2019 Thermal insulating products for building equipment and industrial installations — Determination of maximum service temperature for preformed pipe insulation
• 2013 ISO 180:2000/Amd 2:2013 Plastics - Determination of Izod impact strength - Amendment 2: Precision data
• 2006 ISO 180:2000/Amd 1:2006 Plastics - Determination of Izod impact strength; Amendment 1
• 2000 ISO 180:2000 Plastics - Determination of Izod impact strength
• 1995 ISO 180:1993/Cor 1:1995 Plastics - Determination of Izod impact strength; Technical Corrigendum 1
• 1993 ISO 180:1993 Plastics; determination of Izod impact strength
• 1982 ISO 180:1982 Plastics — Determination of Izod impact strength of rigid materials

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