As all our Cellar Safety and documentation informs you, mixed gas will separate when it is left static over time – we therefore guide it has a maximum life span of 6 weeks.
This is due to Carbon Dioxide being heavier than Nitrogen, so over time the Carbon Dioxide will settle at the bottom of the cylinder leaving the the nitrogen to be withdrawn first (so over time only pure carbon dioxide is left in the base of the cylinder) as you will know, dispensing pure Carbon Dioxide through a smooth flow product will cause excess fobbing and will decrease the quality of beer.
It is therefore imperative that any mixed gas which you have held in stock during COVID is replaced, to avoid issues.
How to identify a MIXED GAS Cylinder
60/40 – Mixed Identified by a Green Shoulder, with a white band beneath, identity 60/40% sticker within the valve guard, 60/40% sticker on the shoulder and a WHITE dust cap.
70/30 – Mixed Identified by a Green Shoulder, with a green painted band beneath, identity 30/70% sticker within the valve guard, 30/70% sticker on the shoulder and a GREEN dust cap.
50/50 – Mixed Identified by a Green Shoulder, with a purple painted band beneath, identity 50/50% sticker within the valve guard, 50/50% sticker on the shoulder and a PURPLE dust cap.
What product uses mixed gas – Lagers, Ciders, Ales & smooth flow products
Mixed gas can dispense a number of products, your lead brewer, lines or drinks supplier will guide you on which gas to use for each product.