They do make beer kegs out of aluminum, although stainless steel is more commonly used in the industry. Aluminum kegs offer some unique advantages and are preferred by certain brewers for specific situations.
Aluminum is a lightweight material, making it easier to handle and transport compared to stainless steel kegs. This can be particularly advantageous for smaller breweries or for events where kegs need to be moved around frequently. I remember a time when I was helping out at a local beer festival, and the organizers opted for aluminum kegs to reduce the physical strain on the staff. It made a noticeable difference in terms of ease and efficiency.
Another benefit of aluminum kegs is their excellent thermal conductivity. This means that they can cool down or warm up quickly, allowing for faster temperature control during the brewing process. I've seen this come in handy when brewers need to rapidly chill their beer before packaging or when experimenting with different fermentation temperatures for certain beer styles.
Aluminum is also more resistant to corrosion than stainless steel. This can be especially important for breweries located in coastal areas or those using harsh cleaning chemicals. I recall visiting a brewery by the ocean where they exclusively used aluminum kegs due to the corrosive nature of the salt air. Despite being exposed to the elements, the kegs held up well and showed minimal signs of rust or degradation.
However, it's worth noting that aluminum kegs are not without their drawbacks. One significant concern is that aluminum is more prone to oxidation than stainless steel. This means that beer stored in aluminum kegs may be more susceptible to off-flavors caused by exposure to oxygen. Brewers need to take extra care in properly purging and sealing aluminum kegs to minimize this risk.
Additionally, aluminum is a softer metal compared to stainless steel, which can make it more prone to denting or damage. While this may not be a major issue for most breweries, those operating in rugged environments or with a high turnover of kegs may need to consider the durability factor.
While stainless steel is the more commonly used material for beer kegs, aluminum kegs do have their place in the industry. They offer advantages in terms of weight, thermal conductivity, and corrosion resistance. However, careful attention must be paid to minimize the risk of oxidation and to ensure the longevity of the kegs. Ultimately, the choice between aluminum and stainless steel kegs depends on the specific needs and preferences of the brewery.