Brochure HDPE - TVK

• Molecular weight distributionPolyethylene consists of molecules of different chain lengths, giving different molecular weights.This is clearly shown by the diagram demonstrating the frequencies of various molecularweight. Molecular weight distribution influences both processing and end product properties.For example, a narrow molecular weight distribution is needed for the injection moulding ofresins if the moulded parts are to be free from all distortion and internal stresses which mightcompromise their environmental stress cracking resistance (ESCR).At the same time, a high molecular weight polyethylene with a wider molecular weight distributionis more suitable for blowing processes to manufacture pipes and films. It should be remembered,however, that the low and medium molecular weight fractions account for easy processing.The high molecular weight fraction gives good mechanical properties (impact strength, creepand warp resistance and ESCR).4product catalogue high density polyethylene