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Which grade for a line or part, grade families, cross-producer equivalents, material-vs-material comparisons, choosing between chemicals.
Transparent ABS is ABS whose rigid matrix carries methyl methacrylate, which brings the matrix’s refractive index to that of the rubber particles so light passes through without scattering. Regular ABS keeps the two phases mismatched, so its rubber particles scatter…
PBT is an engineering polyester that is stiffer, stronger and more resistant to fuels and oils than polypropylene, while polypropylene is the lighter and cheaper material and the better one for alkalis, hot water and living hinges. PBT is the…
A thin-wall, high-cavitation tool needs a high-flow polypropylene homopolymer. The published melt-flow band for that duty runs from 20 g/10 min at the loose end to 60-70 g/10 min for the thinnest packaging sections. A 55 g/10 min grade sits…
A homopolymer is made from a single monomer and a copolymer from two or more, and in commercial resins the second monomer is a minor addition made to correct a specific weakness of the homopolymer. In both polypropylene and acetal…
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…
Specifiers usually arrive at this decision the same way. A supplier sends a quote with a four-character grade code and an MFI number, and the question shifts from “which PP family” to “is this the right family for what I’m…
Acetal copolymer (POM-C) and polypropylene (PP) both list a maximum service temperature near 100 °C. Yet under a 1.8 MPa load, POM-C holds its shape to about 110 °C while PP softens at roughly 55 °C — half the number.…
A Hyosung pipe-grade datasheet states “PPR 125, MRS 12.5 MPa.” The grade number is ten times the minimum required strength at 20 C over 50 years (ISO 12162:2009). That makes it a hydrostatic strength class, not a temperature rating. A…
A spunbond line runs a fibre-grade polypropylene homopolymer resin whose melt flow rate sits between 25 and 40 g/10 min at 230 °C and 2.16 kg. Where in that band you buy follows from line speed and fabric weight: the…
Virgin polypropylene is new resin made to a producer’s grade specification; recycled polypropylene (rPP) is reprocessed from production scrap or used plastic, and it gives up stiffness, lot-to-lot consistency and easy food-contact approval in exchange for recycled content. It is…