Polycarbonate risks There is some reference to health dangers of bisphenol A leaching from polycarbonate plastic on Wikipedia particularly when the plastic is exposed to sodium hypochlorite bleach I note in the Aerobie FAQ that washing the Aeropress in the dishwasher is not recommended presumably for the reason that most dishwasher detergents contain hypochlorite bleach although it is not explicitly stated in the FAQ It is reported elsewhere that the Aeropress uses a new grade of polycarbonate but it is unclear what this is We then learned about a new grade of polycarbonate that is specifically designed to withstand extended exposures to high temperature water We put AeroPress coffee makers made with this new grade of polycarbonate through our tests and they too withstood the tests as well as hundreds of uses with no detectable degradation just like AeroPresses made of the regular grade of polycarbonate The new grade of polycarbonate is over twice as expensive as the conventional grade We could have used conventional grade polycarbonate but as is our way we decided to err on the side of extra durability and quality and made our production AeroPresses of the new high temperature water resistant polycarbonate that is slightly blue ish milky in appearance It might be worth reporting to what extent these issues are of any concern if any and if the milky blue polycarbonate formulation is designed to reduce any possible health risks due to bisphenol A leaching