This paper describes some common problems in the use of cullet as a secondary raw material for the glass industry. First an overview of the use of cullet at EU level will be presented, along with its advantages and disadvantages. Then the paper focuses on the complex European cullet collection and treatment system.After an overview of the most common issues derived from the use of cullet, special attention is drawn to cullet contributions to possible instabilities in the final redox ratio of the produced glass. A new analytical methodology is described, the Inorganic Redox (I-Redox), to check the quality and stability of the produced cullet.The determination of the redox ratio is described theoretically and experimentally as it is usually performed in glass industry as a quality check tool, then the I-Redox is described and discussed as a new tool for the determination of the redox contribution of cullet in the batch and as a parameter for monitoring cullet redox variability.
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