please take a visit here... http://findarticles.com/p/articles/m...9423980...this
may give little idea..
Despite their small package size and high force capability, one common fault with conventional pneumatic or gas (nitrogen-filled) struts is that they are susceptible to slow leaks or punctures during operation, resulting in a load loss over time. And they are not designed to withstand harsh environments such as dust and high temperature applications.
Most gas mercedes strut
manufacturers offer various pressure ratings, forces, strokes and end fittings to meet certain applications within a small package design.