Polymer Fatigue

Why Do Travel Bottles Deform and Loosen? The Physics of Polymer Fatigue Reference Standard: ASTM D648 (Standard Test Method for Deflection Temperature of Plastics Under Flexural Load) & ASTM D2990 (Tensile, Compressive, and Flexural Creep and Creep-Rupture of Plastics) Short Answer The structural failure of a travel bottle set is rarely due to simple manufacturing defects; rather, it is driven by complex polymer physics. When refillable cosmetic dispenser bottles bulk items are subjected to 60°C+ hot water rinses, they suffer thermal-mechanical fatigue that relaxes their crystalline lattice. Simultaneously, being buried under heavy luggage induces dynamic compressive creep and micro-vibrational unthreading, permanently deforming the PE/PP matrix and compromising the closure seal. … 続きを読む