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Small non-refillable bottles of compressed Argon for use in welding applications are available (see fig 5.6). The cylinders are small (~ 1 litre) and light (~ 1Kg) and the argon is stored at relatively high pressure (~ 6000 kPa or 900 psi). A regulator designed for use with the cylinders is available and allows good flow control.
It is important to note though that with a flat rate of gas flow of around 8 litres/ min there is only a useful period of 8 to 10 minutes.
Once the argon gas fills the Exit bag there is little time for reflection!