What material is the inner bag of a Key Keg made from?

The inner bag of a Key Keg is made from plastic, specifically a type of high-density polyethylene (HDPE). This material is chosen for its durability, flexibility, and resistance to punctures, making it ideal for containing liquid and maintaining pressure within the keg. The use of plastic also helps to prevent oxygen ingress, which can spoil the beer, thus preserving its freshness and flavor.

Key Kegs utilize a unique two-chamber system that separates the beer from the gas used for dispensing. The plastic inner bag allows for the contraction and expansion necessary for this system to operate effectively, providing a consistent pour without the risk of oxidation or contamination from outside elements. The choice of plastic as a material signifies an important aspect of modern keg design, focusing on functionality and safety in beer preservation and serving.