Since the beginning of the rubber and plastics industries, an essential requirement has been that the materials and the products are tested for quality control, to establish their fitness for purpose and to provide design data. This book gives a unique personal account of the developments in the technology of physical testing of polymers and of the changes in the working environment in which testing was conducted over the last fifty years. The authoritative account reflects the author's position heading the testing laboratories at RAPRA and his involvement in international standardisation for