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A systematic diagnostic guide to tiger stripes, mold deposits, and flow marks in automotive PP compounds and large injection-molded parts.
PP is not one single material. PP-H, PP-R, and PP-B have different molecular structures, so their heat resistance, toughness, stiffness, and applications differ.
Automotive bumpers cannot be designed around room-temperature strength alone. Modified PP must retain impact toughness in cold weather while balancing stiffness, weathering, weight, and cost.
