Analysis and Discrimination of Electrical Tapes: Part II. Backings

:  The backings of 90 black electrical tapes were analyzed to evaluate the chemical components of these films, the ability of individual techniques to discriminate samples, and the ability of the techniques combined to distinguish samples. The techniques utilized and their respective discrimination...

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Bibliographic Details
Published in:Journal of forensic sciences 2011-11, Vol.56 (6), p.1493-1504
Main Authors: Mehltretter, Andria H., Bradley, Maureen J., Wright, Diana M.
Format: Article
Language:English
Subjects:
Accessories
Analytical chemistry
backing
Backups
Chemical compounds
Discrimination
Electrical equipment
electrical tape
Evaluation
Forensic chemistry
forensic science
Forensic sciences
Fourier transform infrared spectroscopy
Fourier transforms
Gas chromatography
Infrared spectroscopy
Mass spectrometry
Mathematical analysis
Microscopy
Pyrolysis
pyrolysis-gas chromatography/mass spectrometry
Scanning electron microscopy
scanning electron microscopy/energy-dispersive spectroscopy
Stereomicroscopy
Thickness measurement
trace evidence
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Summary::  The backings of 90 black electrical tapes were analyzed to evaluate the chemical components of these films, the ability of individual techniques to discriminate samples, and the ability of the techniques combined to distinguish samples. The techniques utilized and their respective discrimination results were stereomicroscopy and physical measurements, to include observation of surface features of the backing, width, and thickness measurements (c. 64%); Fourier transform infrared spectroscopy (FTIR) using a microscope accessory (c. 83%); pyrolysis–gas chromatography/mass spectrometry (Py‐GC/MS; c. 81%); and scanning electron microscopy/energy‐dispersive spectroscopy (SEM/EDS; c. 87%). Ninety‐four percent of the backings were discriminated through this combination of analytical methods. Finally, evaluating these results in conjunction with previously published data on the analysis of the adhesives from the same set of electrical tapes provided an overall discrimination of nearly 96%.
ISSN:0022-1198
1556-4029
DOI:10.1111/j.1556-4029.2011.01873.x