On creep test loading for soft polymers

The dead‐weight loading speed in the creep test for soft polymers was investigated. The optimum dead‐weight loading speed can be determined so as to assure instantaneous elastic deformation and, at the same time, also avoid dynamic effects. It is found that small dynamic effects are inevitable for soft polymers such as polypropylene even at optimum speed. The experimentally determined optimum dead‐weight loading speed for polypropylene was 300 mm/min for 30 kg dead‐weight at 16°C.