Adaptation and harmonisation of standard testing methods for mechanical properties of low-density polyethylene (LDPE) films

In the framework of a research project carried out at a European level, a preliminary Phase with intercomparisons between measured critical mechanical properties and methods has been completed. The aim was to achieve a satisfactory degree of harmonisation in the testing procedures used by the participants and adapt appropriately the corresponding standard testing methods. The recommended methods for testing the mechanical properties of greenhouse polyethylene films are presented. Following the procedure described in a relevant standard for tensile properties, it was shown that it is very important to define appropriately the whole set of parameters involved in the test. In addition, special adaptation of the equipment used is required. The problems encountered during this work led to the redefinition and modifications of several parameters involved in the procedure of measuring specific tensile properties. Harmonisation of the testing methods for impact and initial tear resistance proved to be more readily obtained. However, some parameters entering the corresponding measuring procedures had to be adapted. In general, harmonisation has been achieved regarding the measurement of the specific mechanical properties. (C) 2001 Elsevier Science Ltd. All rights reserved.