Identification of Origin of Coated Glass Fragments

HRL was approached by a client to conduct a comprehensive analysis to trace the origin of three distinct glass fragments with a distinctive coating. The primary objective revolved around unravelling the composition of both the fragments and the coating, while also pinpointing unique characteristics that could aid in source identification.

HRL initiated the analysis with a stereoscopic optical microscope to examine and measure the largest fragment's dimensions. Notably, the coating was only on one side of each fragment. A sample of the coating was collected before ultrasonic cleaning. For the coating’s elemental composition, HRL used SEM/EDX analysis—an advanced technique involving a scanning electron microscope with an attached X-ray detector. Results revealed a distinctive mixture of elements consistent with phosphor powder used in fluorescent lamp tubes.

The analysis culminated in the conclusion that both the fragments and the coating corresponded to the distinct attributes of compact fluorescent lamps. Notably, the examination revealed that the source article was a delicate glass tube. While the diameter deviated from standard fluorescent light tubes, it aligned with the thickness typically employed in compact fluorescent lamps.

HRL’s experienced Foreign Matter Analysis/Fragment Analysis team effectively addressed the challenge and successfully determined the provenance of both the fragments and the coating. The outcome provided invaluable information about composition and traits, definitively pointing towards a compact fluorescent lamp as the most probable source of origin.