Identification of Composition and Origin of a Metal Fragment

HRL was approached by a client to conduct a foreign matter analysis on a metallic 'blade like' object found in their food product. The client was concerned about the potential impact on their brand reputation and the safety of their consumers. The client requested a thorough analysis to determine the composition and possible origin of the foreign object.

To address the client's concerns, HRL employed a range of analytical methods to identify the composition and origin of the foreign object. The sample was initially observed to exhibit some adhering dry food-like residue, which was removed by ultrasonic cleaning. The precise dimensions and the sample thickness of the foreign object were measured using callipers.

A stereoscopic optical microscope was used to examine the surface features and morphology. The sample exhibited a distinctive metallic appearance with smooth flat surfaces on both sides. Photographs of both sides of the foreign object were taken for further analysis.

To determine the composition of the foreign object, scanning electron microscopy (SEM) with energy dispersive X-ray analysis (EDX) was used. This technique allowed for the identification of the elements present in the sample and their relative concentrations.

The presence of certain elements in the sample suggested that it was most likely made of series 200 stainless steel, a less common type of stainless steel mostly commonly utilised in springs & utensils. Based on the results of the analysis, it was determined that the foreign object was most likely a flat spring used in kitchen tongs.

The results of the analysis provided valuable information to the client, allowing them to identify the possible source of the foreign object allowing them to rule out manufacturing or process related issues.