ISO 29584:2015 建物内のガラス—振り子衝撃試験と安全ガラスの分類 | ページ 2

Foreword

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The committee responsible for this document is ISO/TC 160, Glass in building, Subcommittee SC 2, Use considerations.

This first edition cancels and replaces ISO/TS 29584:2012, which has been technically revised.

Introduction

Accidental human impact with glass panes can be a source of injury. The classification of glass in terms of its ability to withstand impact and the consequences of the glass breaking under such impact has been considered in many countries. The use of a soft body impactor to represent a human body has enabled regulators, code officials and other control organizations to specify glazing that reduces the risk of cutting and piercing injuries.

This International Standard has been prepared as a means of detailing the differences and similarities in pendulum impact tests for the classification of safety glass.

The traditional impactor has been a lead shot-filled leather bag. This has been found to suffer from ageing or shape change and variability in the energy transfer into the test piece if not properly maintained. It has been found that there can be wide variation in the supporting frame or sub-frame.

During their work, CEN/TC 129/WG 13 examined some of the problems associated with the lead shot-filled leather bag impactor and the supporting frame. CEN/TC 129/WG 13 prepared EN 12600 that uses an impactor consisting of steel masses and two tyres.

The primary objectives in developing the new impactor for the evaluation of safety glass can be summarized as follows:

• a) elimination of the differences between
  • 1) taped and un-taped lead shot bags and
  • 2) lead shot bags and bags filled with sand or glass beads;

• b) ageing of lead shot bag;

• c) elimination of the use of lead shot;

• d) harmonization of national impact test methods.

1 Scope

The purpose of this International Standard is to evaluate, by means of soft body impactors, safe breakage characteristics of glazing products intended to reduce cutting and piercing injuries to persons through accidental impact.

This International Standard examines test methods currently employed to determine the pendulum impact performance of safety glass. Use of the methodologies in this International Standard improves the reproducibility of test results and gives a common basis of classification. The aim is for the performance of glass products manufactured and tested in various countries to be better understood and more consistent.

Two types of soft body impactors are defined. The traditional shot bag impactor is detailed both in terms of manufacture and maintenance in an attempt to overcome problems associated with such impactors becoming misshapen. The twin tyre impactor is also detailed.

The test equipment, excluding the impactor, is also described. A method of calibrating the test frame is given. The benefit of calibrating the test equipment is the increased reproducibility of the test results.

Classification of glass products is also detailed. The classification system allows information on the following to be given:

• a) the maximum drop height at which the glass either did not break or broke safely, i.e. in a manner similar to laminated glass or toughened glass;
• b) the manner in which the glass would break, i.e. as toughened glass, laminated glass, annealed glass, irrespective of whether or not the glass was broken during the test;
• c) the maximum drop height at which the glass either did not break or broke safely, i.e. in a manner similar to laminated glass.

This International Standard does not specify the intended use of the products, but provides a method of classification in terms of the performance of the materials being tested. The impact energy used for the various levels of classification are designed to provide the intended user or the legislator with the information to assist in defining the level of safety and protection required relative to the intended location at which the selected safety glass is to be used.

2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. 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.

3.5

crack-free particle

piece of glass that does not contain any cracks that run from one edge to another

Note 1 to entry: See Figure 1.

Figure 1 — Example of crack free particles

Key

1, 3	numbers of crack free particles in each piece of glass

Bibliography