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Both polyethylene and polypropylene land in your warehouse as off-white pellets with a density near 0.91 and a single MFI on the COA. The pellets tell you almost nothing about which one belongs in your part. A converter choosing between…
Polyethylene resin is polyethylene in the form it is bought and sold: a synthetic thermoplastic made by polymerising ethylene and supplied as pellets for converters to extrude or mould into products. It comes in three commodity types, LDPE, LLDPE and…
A single PE100 pipe compound prints three melt flow rates on one datasheet: 0.08, 0.3 and 8.5 g/10 min. Only the middle number, measured at 190 °C under a 5 kg load, is the one the application standard asks for.…
Blown-film LLDPE grades cluster between 0.5 and 1.1 g/10 min melt index. Cast-film grades sit between 2.0 and 3.5, and across the twenty film grades in Westlake’s September 2022 polyethylene portfolio guide the two bands never touch. I read a…
Four organisations publish a resin coded LL0209AA. Their own datasheets print 0.9 or 1.0 melt index, measure density by ISO 1183, ASTM D2839 or GB/T 1033, and quote film properties at 38 microns or at 0.030 mm. That gap sits…
Two observations make a processor certain the new lot is at fault: the gels started when the lot started, and they sit everywhere across the web instead of in a line. That is also what a new resin looks like…
As of early 2026, a kilogram of HDPE and a kilogram of polypropylene quote within roughly 10-20% of each other, both stamped “chemically resistant” on the quote. So the part gets sourced on price. I’ve watched that one decision crack…