Evolved gas analysis

During the evolved gas analysis, the analyzed sample is placed in a quartz glass test tube and inserted in a tubular laboratory furnace. At the bottom of the test tube, a quartz glass capillary is used to insert the helium (carrier gas) flow. The furnace temperature increases at a defined linear rate. Helium carries the released gases into the gas chromatograph. The result of the analysis is the temperature dependence of the amount of released gases. The sensitivity of the used setup allows analyzing also a trace amount of gases evolving during final stages of the batch to glass conversion and during fining.