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3. American Society for Testing and Materials (ASTM), 2000. Standard Test Method for Tensile Properties of Plastics ASTM D 638-00, Philadelphia.
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5. EN 13689, 2002. Guidance on the Classification and Design of Plastics Piping Systems used for Renovation, European Committee For Standardization, Management Centre: rue de Stassart, 36 B-1050 Brussels.