A comparative study of the mechanical properties of low Density polyethylene (ldpe)
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Mechanical properties of engineering polymers which are the most important properties for design and construction purposes are diverse. This has been proved by investigation tensile properties of different grades of LDPE using tensile specimens processed by both injection moulding and compression moulding techniques. A considerable variation in these properties exists among the examined grades for similar chemical structures and similar previous history. The obtained results showed that mechanical properties for compressed samples are better then those obtained for the injected samples. This behaviour could be explained by the difference in the internal stress levels inside the material. Thus, caution must be exercised in selecting the material, its grade and its manufacturing method for a defined design.