AbstractA series of low‐pressure Ziegler polyethylene samples has been fractionated by the sand column technique. The molecular weight distributions have been determined by the Schulz‐Dinglinger approximation. The number‐average, weight‐average, andz‐average molecular weights have been calculated from the fractionation data for each sample by the method of summation. Melt indexes and melt flow ratios have been determined by standard techniques. The melt index is found to be related to the reciprocal of the fifth power of the weight‐average molecular weight, and the melt flow ratio is proportional to thez‐average mol
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