BASF’s current datasheet for PA66 with 25% glass fiber prints two numbers for every mechanical property: a dry-as-molded column and a conditioned column. Tensile modulus reads 8600 MPa dry and 6500 MPa once the part equilibrates to ambient humidity. The…
A snap-fit dispenser lid, a solvent-contact bin, and a painted housing are three different material decisions, and only one goes to ABS. The reputation that ABS is the better engineering plastic holds up right until a part has to flex…
A polypropylene data sheet usually carries four temperatures — a melt point near 165°C, an HDT near 85°C, a Vicat near 100°C, and a continuous-use figure near 90°C. To a buyer scanning the COA, they all read like “the heat…
Polypropylene is a plastic — one specific thermoplastic in the polyolefin family, not an alternative to plastic the way the question often gets asked. “Plastic” is the parent category that also covers polyethylene (PE), PVC, PET, and polystyrene (PS). So…
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…
Copolymer polypropylene resists dimethylformamide (DMF) at room temperature, and DMF does not dissolve it under any ordinary condition. Every chemical-resistance chart converges on the same cell: PP rates “resistant” to DMF at 20 °C, with negligible absorption on a one-month…
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 GPPS spec sheet hands you about ten numbers, and four of them decide whether the resin fits your part. Melt flow index sets the molding window. Vicat softening sets the service-temperature ceiling. Notched Izod tells you whether the part…
A PP COA might list “1500 ppm phenolic AO + 1000 ppm phosphite + 500 ppm slip” and look like a complete additive package. Whether those numbers are correct depends on whether the grade is heading into a hot-water pipe,…
A 25 kg bag of PP pellets received last September is not “last September old.” The producer date stamped on the COA is the real starting point. That date is often 60-90 days earlier than the day the container cleared…