1.1 This part of ISO 527 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 part 1. NOTE 1 For sheets greater than 1 mm thick, the user is referred to part 2 of this International Standard. 1.2 See ISO 527-1, subclause 1.2. 1.3 This part of ISO 527 is not normally suitable for determining the tensile properties of: a) cellular materials; b) plastics reinforced by textile fibres. 1.4 See ISO 527-1, subclause 1.5.