The Nimrod/Nuprol Airsoft Gas is specifically designed for gas-powered airsoft guns. It contains silicone which means that it will keep the rubber and silicone parts of your gun slightly lubricated to maintain the seal.
It is important to use the right gas for the right gun at the right temperatures with the right BBs. Only then you can be sure that your gun functions properly and that it does not get damaged because of too high pressure.
To find out which gas you should use, please go to the gun-specific page or follow the tables below.