Technical
Oct 08, 2026
By Bepa Zhu
K8303 Low-Temp Impact Performance
Standard polypropylene loses impact strength as temperature falls, which is why low-temperature service needs a higher-impact grade. Sinopec PP K8303 is a high-impact copolymer whose rubber phase stays effective well below room temperature.
The mechanism is simple in principle: the dispersed rubbery phase absorbs and blunts cracks that would otherwise propagate through the stiff matrix. More and better-dispersed rubber means more toughness at the cold end of the range.
On the line, processing should preserve that morphology. Excessive shear heat or poorly balanced cooling can alter the phase structure and quietly reduce the very toughness the grade was chosen for.
