How to Choose PP Impact Copolymer MFI: SCGC P640J to P945J (2026)
MFI selection guide for the four SCGC™ PP Impact Copolymer grades — P640J (10), P740J (27), P840J (43), P945J (65). Going from P640J to P945J drops 23 °C notched Izod ~34% (98 → 65 J/m) while flexural modulus rises ~17%, and cycle time can drop 12–25%. P640J and P740J are the only grades with published –20 °C Izod (both 39 J/m) — a tie that matters for cold-service parts. Includes a wall-thickness × MFI selection matrix, cycle-time delta table, ASTM D1238 certificate-reading guide, an RFQ specification template that doesn't lock out approved cross-references, and a brief P945J vs Y40 cross-reference for the high-flow window where impact copolymer and homopolymer overlap.
Pedro ZaccariaRead More
