International Organization for Standardization

Glass in building - Pendulum impact testing and classification of safety glass
 N DIS 29584

Annotation

This Technical Specification examines test methods currently employed to determine the pendulum impact performance of safety glass. Use of the methodologies in this Technical Specification 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 accepted.

The purpose of this Technical Specification 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.

Two types of soft body impactor 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.