When blowing it, it seems that it's not only gas, but I assume that it's part of the product, is this safe?
Liquid should not be coming out - make sure you keep the can upright and don't hold the button down, use short bursts. I don't think the liquid should cause any significant problems beyond making the dust a bit harder to remove, just don't get it on you - it's extremely cold and may give you a burn. It's not a very good idea to cool down your expensive electronics in this way, though it can be useful to detect overheating components when designing your own electronic circuits. In such cases the can is designed to let the liquid out.
It hopefully goes without saying that you shouldn't breathe the gas in, either!