ISO 3873:2025 産業用保護ヘルメット | ページ 2

Foreword

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This document was prepared by Technical Committee ISO/TC 94, Personal safety — Personal protective equipment

This second edition cancels and replaces the first edition (ISO 3873:1977), which has been technically revised.

The main changes are as follows:

• Introduction of a Type II helmet that is intended to protect the front, side and rear of the wearer’s head. Reflecting this change is the introduction of impact energy attenuation requirements, dynamic strength of the retention system and dynamic stability tests.
• Elimination of mandatory harness dimensions and clearances for Type I helmets. A Type I helmet could be constructed using a conventional harness system, but it could also be constructed using an impact energy attenuation liner.
• Introduction of resistance to ignition tests to replace the flame resistance requirements.

Future considerations:

• Impacts to the head that result in head angular motion (referred to as angled, tangential or oblique impacts) are one of the causes of brain injury. The revisions to the standard have not addressed directly the performance of systems intended to manage head angular motion. The introduction of a Type II helmet will offer some improvements in managing head angular motion with regards to the first edition of ISO 3873 because of the additional impact energy attenuation tests. At the time that second edition of ISO 3873 was developed, no test method was available that could be readily incorporated into this standard. In the future, when a suitable oblique impact test method and risk analysis are available, the ambition of this committee is to revise this document and include requirements for such a test.

Introduction

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1 Scope

This document specifies physical and performance requirements, test methods and marking requirements for industrial protective helmets. This document describes the requirements for two helmet types.

Type I — intended to protect the upper part of wearer’s head against impacts that may occur in an industrial setting, such as a falling object.

Type II — intended to protect the head against impacts that may occur in an industrial setting, such as a falling object or a fall.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

3 Terms and definitions

For the purposes of this document, the following terms and definitions apply.

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