Polypropylene (PP) Resin: Homopolymer & Impact Copolymer Grades

PP homopolymer (PPHOMO) contains only propylene monomer, giving the highest stiffness, surface hardness, and crystallinity in the PP family but brittleness below 0 °C. PP impact copolymer (PPCOPO / HECO) adds a dispersed ethylene–propylene rubber phase to a homopolymer matrix, delivering low-temperature impact resistance down to roughly –20 °C at the cost of some flexural stiffness. Syntex America supplies both: the SCGC™ P-series for PPCOPO and Oriental Energy Y40 for PPHOMO.

Match the grade in three steps. First, eliminate Y40 if the part sees temperatures below 0 °C — specify a SCGC™ P-series impact copolymer instead. Second, match the part geometry to MFI: low (P640J, 10 g/10 min) for thicker walls, mid (P740J, P840J) for general injection, high (P945J at 65, Y40 at 40) for thin-wall and large-cavity tools. Third, confirm food-contact compliance per grade before specifying.

Melt Flow Index (MFI) — also called Melt Flow Rate (MFR) — is the mass of polymer in grams that flows through a standardised capillary in 10 minutes at 230 °C under a 2.16 kg load (ASTM D1238). Low MFI (e.g., 10 g/10 min, P640J) means higher molecular weight and is suited to thicker walls or extrusion. High MFI (e.g., 65 g/10 min, P945J) means lower molecular weight and faster fill of thin-walled, large-cavity tools.

Three of the four SCGC™ PPCOPO grades supplied by Syntex America — P640J, P740J, and P840J — carry the manufacturer's documented compliance with FDA 21 CFR 177.1520 and EU Regulation (EU) No 10/2011, plus RoHS 2, REACH, and UL Yellow Card E202743. P945J and Y40 do not display equivalent compliance on the manufacturer's public product card; request a written compliance statement before specifying either for food-contact applications.

P640J (MFI 10) is specified for rigid impact parts — automotive components, electrical appliance bodies, furniture, and toys. P740J (MFI 27) suits medium-flow injection of refrigerator top tables, washing-machine cabinets, and automotive trim. P840J (MFI 43) is used for high-flow injection of automotive battery cases and complex appliance parts. P945J (MFI 65) is reserved for very-high-flow thin-wall and large-volume parts — household storage boxes and large household appliances.

Y40 is a PP homopolymer supplied by Oriental Energy / Donghua Energy at MFI 40 g/10 min for injection moulding of rigid thin-wall parts where stiffness and crystallinity dominate. Compared with the SCGC™ P-series impact copolymers, Y40 offers higher tensile yield and surface hardness but is brittle below 0 °C — it has no rubber phase and therefore no cold-impact reserve. Pick Y40 for stiff thin-wall injection at room temperature; pick the P-series for cold-service or high-impact parts.

Within the SCGC™ P-series, MFI rises from 10 (P640J) through 27 (P740J) and 43 (P840J) to 65 g/10 min (P945J). As flow rises, notched Izod at 23 °C drops from 98 J/m to 65 J/m and tensile yield drops slightly from 27.5 to 26.5 MPa, while flexural modulus rises from ~1,177 to ~1,373 MPa. High-flow grades favour thin-wall parts and fast cycles; medium-flow grades retain more impact toughness.

For service near or below 0 °C, specify a SCGC™ PPCOPO impact copolymer rather than the Y40 homopolymer. P640J (MFI 10) gives the highest cold-impact reserve in the family with notched Izod ~39 J/m at –20 °C and ~98 J/m at 23 °C; P740J retains comparable –20 °C ductility (~39 J/m) at higher flow. P945J trades cold-impact reserve for very high flow — confirm the low-temperature value with the current SCGC datasheet before specifying it for cold service.

Polypropylene carries Resin Identification Code 5 under ASTM D7611 (the recycling triangle marked “5” / “PP”). All five PP grades supplied by Syntex America are mechanically recyclable into recycled PP (rPP) through municipal curbside and industrial reclaim streams. Recovery rates have improved steadily as more recyclers add PP sorting capacity, and U.S. Plastics Pact and EU Plastics Strategy targets are driving rising rPP content in food-contact and consumer-packaging streams.

Syntex America supplies the SCGC™ P-series PPCOPO grades — P640J, P740J, P840J, and P945J — to converters and OEMs across North, Central, and South America. We also supply the Oriental Energy Y40 homopolymer from Donghua Energy (China). Datasheets, NCM tariff classification, MOQ, and freight quotes are returned within 24 hours of an inquiry through the form on this page.

Lead times for PP depend on origin, destination port, and current inventory at our Miami logistics hub. MOQ is structured by container — typically a full container load for new accounts, with split-volume and consolidated freight available for repeat customers under a structured supply contract. Submit a quote request with your destination port, target volume, and grade to receive a written lead-time and MOQ commitment within 24 hours.

Yes — the SCGC™ P640J, P740J, and P840J grades carry the manufacturer's documented compliance with Regulation (EU) No 10/2011 (plastics in contact with food), RoHS 2 (Directive 2011/65/EU), REACH (EC 1907/2006), and Packaging Directive 94/62/EC. P945J and Y40 are not listed with EU 10/2011 compliance on the public product card; request a written compliance statement from Syntex America before specifying either for European food-contact applications.