1️⃣Tensile Strength：10% polymer Content: Usually ** ≤ 300 psi ** 20% polymer Content: Up to ** ≥ 500 psi ** (Strong Tear Resistance ）。 - ** Resilience **: 10%: Rebound rate may be < 30%, stomping feeling stiff. - 20%: Rebound rate > 40%, providing effective sports cushioning (such as track track ≥ 35%). 2️⃣Durability and aging ：10% polymer content: - Fillers (such as calcium carbonate) are easy to precipitate in contact with water/ultraviolet rays, resulting in ** pulverization (2-3 years obvious surface shedding ）**。 - UV protection is weak, color fading fast (pigment attached to the rubber matrix less). 20% polymer content: - EPDM itself is very weather resistant, ** life can reach 8-10 years ** (such as international race track standards). - Pigment is wrapped in rubber, better color retention.
