Undoubtedly one of the most recognizable and elegant coffee makers available. The Chemex was designed in 1941 and has been making delicious coffee ever since. Its non-porous, heat-resistant glass construction, combined with proprietary, scientifically designed filters, produces coffee with clarity and complexity. In fact, it's the filters that are the star of the Chemex show. They are 20-30% heavier than other filters and remove even the finest sediment particles. The design of the filter facilitates the proper infusion time by regulating the filtration rate - about a 4 minute brew.