A series of glass specimen [Na 2 WO 4 .2H 2 O] 1 - x [Fe 2 O 3 ] x with x = 0, 0.10, 0.15, 0.20 and 0.25 were prepared. The infrared absorption spectra of these sodium tungstate dihydrate glass specimens containing iron oxide have been studied as a function of iron oxide. It was found that the addition of Fe 2 O 3 introduced a new absorption band at 1425 cm [1] not present in the infrared spectrum of a pure (Na 2 WO 4 2H 2 O)) glass sample. Differential scanning calorimetry measurements showed endothermal reactions varing from 117°C to 130°C depending on the Fe 2 O 3 concentration.