Types of Gas-Oxygen Torches

There are operations in the laboratory that require more flame heat than a Bunsen or Fisher burner can provide. For example, if you wish to fire-polish the end of a chipped glass tube or seal off (also called tip off ) a sample for NMR study, you will need to use a gas-oxygen torch. 

Superficially, the torches look similar. However, there are distinct advantages and disadvantages to both. The premix design is less expensive, and because it has one flame emitted from the tip (see Fig. 8.2) it is possible to obtain precise heating 

Gases are mixed in the neck of the torch before they reach the tip 

Oxygen is released from the space surrounding the gas tubes. 

The connection between the gas hose connection of the torch and the gas source can be made using Tygon, an amber latex, or any similar tubing used to connect 

---