Polymers are macromolecules and their morphologies are not identical even for the same generic polymer. Each processing grade requires unique melt flow behaviour and Molecular Weight/distribution. Hence tinkering with different melt flow grades of the same plastic just for economic reason will not work. For example, extrusion grades require the lowest melt flow whereas injection requires highest flow. Consult a technical advisor for your application rather attempting to mix and match. Best wishes R Baascaran Chennai INDIA

You'd likely be better off to add a lower MW grade of PE to reduce your melt index flow. Wax is usually used as a mold release, and it tends to degrade the overall physicals of the virgin polymer. If one assumes that "PE" is essentially wax, they by all means add the proper low MW fractions of PE.

thanks cardio,

unfortunately I am recollecting plastics and I can't choose. But I have received great ideas from all of you. what I know now is that when 2 melt flow materials are way apart on their MFI one burns and loose all it's mechanical properties and release unpleasant odors where the low melt is stuck partially melted in to the walls of the product. The key success factor lei's on large warehousing to accumulate same melt and same grade an color for each batch. along with experimenting all the suggestions made available so kindly to me.

2 parts fitting one on the other is impossible due to the variation on the shrinkage factor.

Can you correct or confirm that low molecular weight means that the molecules are smaller in size than higher MW. and than lower the MW, The better the MFI? So My question is if there is a chart that translate the MW into commercial MFI?

I wish to receive more comments.