A medical device used to screen the hearing of newborns has undergone a material makeover. Components of the Echo-Screen, which has been on the market for 10 years, originally were fabricated from a PC/ABS alloy. Presumably because of the BPA controversy, which some studies have linked to human health concerns, Natus Medical (San Carlos, CA) established new material requirements for its infant-care products, starting with the Echo-Screen. The company chose Tritan copolyester MXF121 from Eastman Chemical Co. (Kingsport, TN) as the material of construction for its new Echo-Screen III device.
The opaque Tritan MXF121 copolyester is not manufactured with BPA and has superior chemical resistance, says Eastman, and the material also is made without halogens or ortho-phthalate plasticizers. Introduced earlier this year for the medical market, the material is intended for use in handheld and other medical device housings. Its chemical resistance is an especially attractive feature for these applications.