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Why Does Your Body Wash Brush Lose Its Texture and Skin-Feel? Reference Standard: ASTM D1693 (Standard Test Method for Environmental Stress-Cracking of Ethylene Plastics) and ISO 868 (Determination of Indentation Hardness of Plastics and Ebonite by Means of a Durometer). Short Answer The degradation of a body wash brush is primarily caused by boundary lubrication collapse at the filament tips and synergistic surfactant swelling within the polymer’s amorphous zones. Repeated friction depletes surface energy, increasing the coefficient of friction from 0.12 to over 0.45, while chemical surfactants like SLS infiltrate the plastic matrix, weakening Van der Waals forces and inducing structural warpage or pitting. Tribological Surface Energy Depletion: The Boundary … 続きを読む