Contaminant
on Molded Part
Technique
Used: Fourier Transform Infrared Spectroscopy (FTIR)
The
customer submitted samples of a molded plastic part with a white residue
present in the crevices of the part. The purpose of the analysis
was to identify the residue and it's source. The residue was analyzed
using the microscope attachment to the FTIR. The spectrum obtained
suggested the material was a surfactant. A sample of the surfactant
used in the processing of these parts was obtained, analyzed and compared
to the residue. The residue was due to the incomplete removal of
the surfactant.

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