In the roaring 1920s, as the world turned its back on Prohibition, a brand new material began to be used in the brewing industry - namely stainless steel. The year 1928 marked the introduction of the world's first stainless steel fermenting vessel, a game-changer that transformed beer production into a precise science. Pioneered in Europe and swiftly adopted globally, this innovation stemmed from British metallurgist Harry Brearley's 1913 and his invention of "rustless steel".
But why was stainless steel so perfect for the brewing industry? Essentially it's all about its chromium content, typically 10.5% or more, which forms a passive oxide layer on the surface. This self-healing barrier provides exceptional corrosion resistance, crucial in the acidic, moist environment of fermentation where traditional wooden or copper vats would degrade, harbour bacteria, and impart unwanted flavours.
Stainless steel's non-porous nature ensures hygienic conditions, preventing microbial contamination that could spoil batches and pose health risks. Grades like 304 or 316, with added molybdenum for enhanced pitting resistance, withstand the rigours of cleaning with harsh chemicals or steam without leaching metals into the brew. All this science adds up to a great tasting beer down the local!
The impact of stainless steel was huge. Breweries scaled up production with consistent quality, reducing waste and meeting soaring demand. This set standards for food safety, influencing industries from dairy to pharmaceuticals. Today, over 90% of commercial beer ferments in stainless steel tanks.
Now, at DSM we do make bespoke products for pubs, like stainless steel sluices & slop hoppers and bar sinks (so get in touch if you would like a price). And finally (don't groan...) why did the brewery keep rabbits on hand? So they could add the hops.
For more historical stainless steel stories on our website have a look at these past articles:
Elwood Haynes, Stainless Steel and the Early Motor Car
The worlds first stainless steel flying boat!
Image used is just for artistic purposes.