1.1 This document specifies the conditions for determining the tensile properties of plastic films or sheets less than 1 mm thick, based upon the general principles given in ISO 527-1. NOTE For sheets greater than 1 mm thick, the user is referred to ISO 527-2. 1.2 See ISO 527-1:2012, 1.2. 1.3 This document is not normally suitable for determining the tensile properties of a) cellular materials, and b) plastics reinforced by textile fibres. 1.4 See ISO 527-1:2012, 1.3.