Specifies the ball pressure test as a method for testing parts of non-metallic materials for resistance to heat.Includes the following significant technical changes from the previous edition:a) The post test water immersion time (see 7.1) has been changed.b) dimension d is no longer the diameter but the greatest dimension of the indentation (see 7.2 and Figure 2).c) The stated accuracy of the measuring table has been deleted (see 4.4).Has the status of a basic safety publication in accordance with IEC Guide 104The contents of the corrigendum of February 2006 have been included in this copy.