Volume 46, Issue 1 (January 2001)

    Discrimination of 1990s Original Automotive Paint Systems: A Collaborative Study of Black Nonmetallic Base Coat/Clear Coat Finishes Using Infrared Spectroscopy

    (Received 8 October 1999; accepted 21 March 2000)

    CODEN: JFSOAD

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    Abstract

    The 1990s saw the introduction of significantly new types of paint binder chemistries into the automotive finish coat market. Considering the pronounced changes in the binders that can now be found in automotive paints and their potential use in a wide variety of finishes worldwide, the Paint Subgroup of the Scientific Working Group for Materials (SWGMAT) initiated a validation study to investigate the ability of commonly accepted methods of forensic paint examination to differentiate between these newer types of paints. Nine automotive paint systems typical of original equipment applications were acquired from General Motors Corporation in 1992. They consisted of steel panels coated with typical electrocoat primers and/or primer surfacers followed by a black nonmetallic base coat and clear coat. The primary purpose of this study was to evaluate the discrimination power of common forensic techniques when applied to the newer generation original automotive finishes. The second purpose was to evaluate interlaboratory reproducibility of automotive paint spectra collected on a variety of Fourier transform infrared (FT-IR) spectrometers and accessories normally used for forensic paint examinations. The results demonstrate that infrared spectroscopy is an effective tool for discriminating between the major automotive paint manufacturers' formulation types which are currently used in original finishes. Furthermore, and equally important, the results illustrate that the mid-infrared spectra of these finishes are generally quite reproducible even when comparing data from different laboratories, commercial FT-IR instruments, and accessories in a “real world,” mostly uncontrolled, environment.


    Author Information:

    Flanagan, B
    North Carolina Bureau of Investigation, Raleigh, NC

    MacDougall, D
    Royal Canadian Mounted Police, Ottawa, Ontario

    Suzuki, E
    Washington State Patrol, Seattle, WA

    Bishea, G
    Federal Bureau of Investigation, Washington, DC

    Brun-Conti, L
    Michigan State Police, East Lansing, MI

    Eyring, M
    Arizona Department of Public Safety, Phoenix, AZ

    Ryland, S
    Florida Department of Law Enforcement, Orlando Regional Operations Center Crime Laboratory, Orlando, FL

    Jergovich, T
    Georgia Bureau of Investigation, Decatur, GA


    Stock #: JFS14908J

    ISSN: 0022-1198

    DOI: 10.1520/JFS14908J

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    Author
    Title Discrimination of 1990s Original Automotive Paint Systems: A Collaborative Study of Black Nonmetallic Base Coat/Clear Coat Finishes Using Infrared Spectroscopy
    Symposium , 0000-00-00
    Committee E30