Chemex
The Chemex is a manual pour-over brewer invented in 1941 by German-American chemist Peter Schlumbohm. Its defining feature is the use of thick, bonded paper filters — 20–30% heavier than standard drip filters — which remove virtually all oils and fine particles, producing a remarkably clean, bright, and sediment-free cup. The iconic single-piece hourglass vessel, with its wooden collar and leather tie, has been part of the Museum of Modern Art (MoMA) permanent collection since 1944. Typical brew parameters: 1:15–1:17 coffee-to-water ratio, grind coarser than V60, total brew time of 4–5 minutes. The bypass technique is commonly used with Chemex for TDS adjustment.
Background & Context
The Chemex is an hourglass-shaped pour-over brewer invented in 1941 by Peter Schlumbohm, a German-American chemist with 300 patents to his name. What distinguishes it from other pour-over brewers is its proprietary bonded paper filter — 20–30% heavier than standard drip filters — which removes virtually all coffee oils and fine particles, producing a cup of exceptional clarity, sweetness, and delicacy. Schlumbohm reportedly called it 'the most beautiful thing I've ever seen', and the design has been exhibited in the New York Museum of Modern Art since 1943. The Chemex comes in 3-cup, 6-cup, 8-cup, and 10-cup sizes (where one 'cup' equals 5oz/150ml). In specialty coffee, the Chemex experienced a renaissance in the 2010s, appearing prominently in the Netflix series House of Cards and becoming an icon of the third-wave aesthetic. Its thick filter means a longer brew time (4–5 minutes for a 6-cup) and requires coarser grinding than a V60 to achieve the same extraction yield, because the filter's resistance slows the drawdown significantly. The Chemex is particularly valued for showcasing the terroir of delicate washed Ethiopians and light roast single origins — coffees whose complexity would be overwhelmed by a French press or espresso's intensity.
Practical Use
For a 40g / 600g water Chemex brew (six cups): grind coarser than you would for V60 (think table salt texture). Pre-rinse the filter with hot water to seal it to the glass. Bloom with 80g water for 45 seconds. Then pour in three stages: 200g, 200g, 120g, each time waiting for the drawdown to begin before the next pour. Total brew time: 4–5 minutes. If shorter, grind finer; if longer, grind coarser. The Chemex is an excellent batch brewer — scale up proportionally for larger groups.
Related Terms
Related terms: V60 — thinner filter, faster drawdown, more body. Bloom — essential first step. Percolation — the extraction principle used. Body — Chemex produces notably lighter body than immersion methods.