MASTER TD guarantees excellent analysis  performances by using a two-stage thermal desorption process: the volatile and semi-volatile compounds (upto C44) are desorbed from the sample by heating in a flow of inert gas and refocused in a narrow-bore packed trap kept at low temperature and filled with one or more sorbent materials.

The trap is heated instantaneously and the components are introduced in a narrow band directly into the analytical column through a heated transfer line.

The refocusing step offers significant advantages if compared with a direct desorption into the column, the rapid transfer of the analytes keeps the peak width  and the chromatographic resolution uncompromised; further more the trap desorption in back-flush mode improves efficiency in the transfer and allows the use of multi-layer traps.

Compared to cryofocusing devices, the use of a packed trap eliminates the need of cryogenic liquid, reduces the risk of ice formation and guarantees more reliable quantitative results.