Standard single-load melt index tests mischaracterize high molecular weight polyethylene by ignoring shear thinning, requiring multi-load flow ratio verification.
Polyethylene melt flow testing requires 190 °C with load selection matched to resin flow: 2.16 kg for standard grades and 21.6 kg for high-density resins.
Polyolefin melt flow shifts reveal chain scission or crosslinking under repeated shear, requiring strict multi-point viscosity and antioxidant monitoring.
Melt flow rate thresholds for recycled polyolefin blends must be set using multi-load shear testing to bound contamination and prevent processing scrap.
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