The AeroPress is a device for brewing coffee. It was invented in 2005 by Aerobie president Alan Adler Coffee is steeped for 10–50 seconds (depending on grind and preferred strength) and then forced through a filter by pressing the plunger through the tube. The filters used are either the AeroPress paper filters or disc shaped thin metal filters. The maker describes the result as an espresso strength concentration of coffee, but its most frequent use is more in the filter brew strength.
The device consists of two nesting cylinders. One cylinder has a flexible airtight seal and fits inside the larger cylinder, similar to a syringe.
The cylinders are moulded of polypropolene, tinted a grey colour. The first Aeropress were moulded of clear polycarbonate, then later of copolyester copolyester, clear and later tinted. The materials change away from polycarbonate was driven by the market fashion for BPA-free materials, even though no leaching of this material had occurred. Later changes were for aesthetic and strength reasons.