Volume 44, Issue 6 (November 1999)

    Infrared Spectra of U.S. Automobile Original Topcoats (1974–1989): VI. Identification and Analysis of Yellow Organic Automotive Paint Pigments—Isoindolinone Yellow 3R, Isoindoline Yellow, Anthrapyrimidine Yellow, and Miscellaneous Yellows

    (Received 5 February 1999; accepted 8 March 1999)

    CODEN: JFSOAD

      Format Pages Price  
    PDF Version 25 $25   ADD TO CART


    Abstract

    Two yellow organic pigments, Benzimidazolone Yellow 3G and Benzimidazolone Yellow 4G, were identified in some U.S. automobile original (OEM) topcoats (1974–1989) in previous work in this study. The topcoats consisted of single layer finishes (monocoats) from the Reference Collection of Automotive Paints, and the pigments were identified in situ using infrared spectroscopy. The identification, analysis, and occurrence of other yellow organic pigments used in these finishes, including Isoindolinone Yellow 3R, Isoindoline Yellow, and Anthrapyrimidine Yellow, are described here. Based on a spectral survey of Reference Collection yellow, orange, brown and green nonmetallic monocoats, absorptions of Isoindolinone Yellow 3R were observed in the spectra of approximately three dozen yellow monocoats and one dozen orange ones. Isoindoline Yellow was identified in a single orange nonmetallic enamel. This pigment is now more common since it was one of several replacements for Chrome Yellow—a popular lead-containing pigment which is no longer used in U.S. automobile OEM finishes—and it was identified in several recent yellow nonmetallic basecoat/clearcoat finishes. Weak absorptions of Anthrapyrimidine Yellow were identified in the spectrum of a single yellow nonmetallic enamel. Spectra of several other yellow organic automotive paint pigments are also presented and discussed.


    Author Information:

    Suzuki, EM
    Forensic scientist, Washington State Crime Laboratory, Washington State Patrol, Seattle, WA


    Stock #: JFS14584J

    ISSN: 0022-1198

    DOI: 10.1520/JFS14584J

    ASTM International
    is a member of CrossRef.

    Author
    Title Infrared Spectra of U.S. Automobile Original Topcoats (1974–1989): VI. Identification and Analysis of Yellow Organic Automotive Paint Pigments—Isoindolinone Yellow 3R, Isoindoline Yellow, Anthrapyrimidine Yellow, and Miscellaneous Yellows
    Symposium , 0000-00-00
    Committee E30