Materials used in the AeroPress® coffee maker
We recently switched to making the chamber and plunger out of polypropylene. This means that all of the AeroPress parts except the rubber like seal are now made of polypropylene. We made the change because tests indicated the polypropylene is more durable. We regret the polypropylene is less transparent but feel the additional durability is more important. The rubber like seal on the end of the plunger is made of a thermoplastic elastomer. Both materials are FDA approved for use in contact with food. Neither of the materials contain bisphenol-A (BPA) or any phthalates.
We frequently get asked if we plan to make a glass or stainless steel AeroPress coffee maker. Interestingly, we also receive frequent emails from consumers thanking us for not making the AeroPress of glass. I suspect those people are tired of breaking glass coffee carafes or presses. The facts are that glass is fragile, heavy, highly conductive of heat, and expensive to manufacture with the tolerances required for the AeroPress. People also ask how about stainless steel. Unfortunately stainless steel is heavy, highly conductive of heat, and expensive. We therefore have no plans to make a glass or stainless steel AeroPress coffee maker. We believe that the AeroPress coffee maker we currently manufacture is superior to a glass or stainless steel AeroPress coffee maker.