Standard Guide for Fourier Transform Infrared Spectroscopy in Forensic Tape Examinations

Importancia y uso:

5.1 This guide is designed to assist an examiner in the selection of appropriate sample preparation methods for the analysis, comparison, and identification of pressure sensitive adhesive (PSA) tapes. If no meaningful differences are noted between the known and unknown samples regarding physical appearance or measurements, then IR spectroscopy should be the next step in the analytical scheme.

5.2 Infrared spectroscopy can provide molecular information regarding major organic and inorganic components. For various reasons, components in lesser amounts are typically more difficult to identify unequivocally. Reasons for this include interference of the absorption bands of the major components with the less intense bands of minor components and sensitivity issues whereby the minor components are present at concentrations below the detection limits of the instrument.

5.3 Infrared spectroscopy can be used to obtain spectra for elucidation of the chemical composition of a tape and for comparison of two or more tape samples. When used for spectral comparisons, the objective is to determine whether any meaningful differences exist between the samples.

Subcomité:

E30.15

Referida por:

E1732-24E01, E2809-22, E3260-21, E3233-20

Volúmen:

14.02

Número ICS:

07.140 (Forensic science)

Palabras clave:

adhesive; analysis; backing; fiber reinforcement ; forensic examinations; infrared spectroscopy; pressure sensitive adhesive (PSA) tape;