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Bio-polypropylene is made in three steps: a renewable feedstock such as sugar crops, wood residues or used cooking oil is converted into propylene by one of several routes, and that bio-propylene is polymerized in ordinary PP plants the same way…
Polypropylene’s glass transition sits close to 0 °C: read as the tan δ peak in a DMA run at 1 Hz and 3 °C/min, the isotactic matrix relaxes at about 1 °C (33.8 °F). ISO 11357-2 defines Tg as a…
Two PP compounds at identical 20 wt% elastomer loading can land on opposite sides of a cold-impact specification. One fractures at 0 °C with zero ductile failure. The other absorbs 23 kJ/m² and stays ductile past 60% of its cross-section.…
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…
CPP and BOPP are the same polymer taken down two different film lines: CPP is cast polypropylene film, quenched on a chill roll and never stretched, and BOPP is biaxially oriented polypropylene film, stretched in both directions after casting. That…
Polycarbonate is the stiffer, tougher and more heat-resistant of the two, and it comes out of the mould glass-clear at any wall thickness; polypropylene is a quarter lighter, cheaper per kilogram, moulds without a dryer, and takes the bases and…
Polypropylene is a resin, and which comparison you are actually making depends on which sense of the word is in front of you. In the plastics trade, “resin” is the polymer as it is sold — PP, PE and PET…
A polypropylene product lasts anywhere from one filling to more than a hundred years, and where a given part sits in that range is set by its product class, its exposure and the failure criterion someone attached to it. How…
Two impact copolymer quotes sit on the desk. One reports notched Izod at 115.1 J/m, the other a Charpy floor of 40 kJ Dividing an energy by a length and dividing it by an area do not produce the same…
A woven sack tape line runs on a polypropylene homopolymer with a melt flow rate near 3 g/10 min (230 °C / 2.16 kg) and an isotactic index above 95%. That single sentence narrows thousands of commercial PP grades to…