1.1 This guide applies to the forensic infrared (IR) analysis of paints and coatings and is intended to supplement information presented in the Forensic Paint Analysis and Comparison Guidelines also written by SWGMAT. This guide is limited to the discussion of Fourier transform infrared (FTIR) instruments and provides information on FTIR instrument setup, performance assessment, sample preparation, analysis, and data interpretation. It is intended to provide an understanding of the requirements, benefits, limitations, and proper use of IR accessories and sampling methods available for use by forensic paint examiners. The following accessory techniques will be discussed: FTIR microspectroscopy (transmission and reflectance), diamond cell, and attenuated total reflectance. The particular methods used by each examiner or laboratory or both are dependent upon available equipment, examiner training, specimen size or suitability, and purpose of examination. This guide does not cover the theoretical aspects of many of the topics presented. These can be found in texts such as An Infrared Spectroscopy Atlas for the Coatings Industry (Federation of Societies for Coatings, 1991) and Fourier Transform Infrared Spectrometry (Griffiths and de Haseth, 1986). 1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
infrared spectroscopy; paint; coatings; forensic examinations; analysis
The title and scope are in draft form and are under development within this ASTM Committee.
Citing ASTM Standards
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