Housings molded from Eastman Tritan? copolyester offer outstanding resistance to lipids, Renalin? sterilant, and a wide range of disinfectants. The improved chemical resistance of Tritan? also means improved ESC resistance during solvent bonding and other secondary operations.
The following spiral flow pictures highlight the combination of chemical resistance and good flow properties. All test spirals were dipped in Virex? Tb, a common medical disinfectant, demonstrating residual stress can cause cracking in molded parts on exposure to chemicals and disinfectants.
Chemical resistance with externally applied stress
The following photo demonstrates the excellent ESC resistance of Eastman Tritan? copolyester. An external stress was applied to the plaques pictured, and then each plaque was exposed to Virex? Tb. Eastman Tritan? copolyester resists craze and crack initiation and propagation, maintaining the physical integrity of the injection molded part.
Outstanding impact strength and toughness
Eastman Tritan? copolyester compares favorably with polycarbonate (PC) for both major toughness metrics—and offers significantly greater impact strength than other common thermoplastics (acrylics, styrenics, copolymers thereof, and polyolefins).
Retains clarity, color, and strength after sterilization
Compared with polymers that shift color significantly after sterilization—
or become opaque and hazy—
Eastman Tritan? copolyester provides superior color and clarity retention. See the following photo for an actual comparison of Tritan with lipid-resistant polycarbonate and general-purpose polycarbonate after sterilization.
Tough to beat for processability
Eastman Tritan? copolyester processes similarly with PC, but with less risk of black speck formation—and without requiring an annealing step.
The low residual stress, combined with outstanding chemical resistance of Eastman Tritan? copolyester, lowers system costs by allowing greater secondary operation flexibility and yield.