MATERIALS: TPU/Crosslinked Silicone Rubber for Overmolding TPEs

Hybrid of TPU and crossliked silicone rubber is safe for skin contact in wearable electronic applications.

Two thermoplastic elastomers from Dow Corning, Midland, Mich., have been proven to be safe for skin contact in wearable electronic applications in two independent medical test protocols. TPSiV 4000 and 4200 TPEs are a unique hybrid of TPU and crosslinked silicone rubber that combine durability, abrasion resistance and overmolding options of TPUs, with the softness and resistance to UV light and chemicals offered by silicone technology. These elastomers can be precisely color-matched to customer specifications and maintain their excellent, long-lasting aesthetics even for the most demanding wearable device applications.

            In vivo testing, performed in accordance with the United States Pharmacopeia’s (USP) General Chapter <88>, Biological Reactivity protocol, confirmed that TPSiV 4000 and 4200 both lack cytoxic potential and show no potential for systemic toxicity and skin irritation. 


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