FTIR Analysis

FTIR Spectroscopy for Material Identification & More

FTIR Analysis, also known as FTIR Spectroscopy, is an infrared spectroscopy method used to identify organic, polymeric, and in some cases, inorganic materials. The FTIR test uses infrared light to scan test samples and observe chemical properties.

FTIR Analysis from Chemistry Specialists

Laboratory Testing Inc. performs FTIR Spectroscopy Analysis with a high-tech Thermo Scientific Nicolet iS10 FT-IR Spectrometer. The Lab is located in the Philadelphia, PA area of the United States.

The test is performed in absorbance, but can be converted to transmittance. Both qualitative and quantitative information about the test sample can be provided.

FTIR analysisValuable Results from FTIR Spectroscopy

Our chemists use FTIR Analysis to assess the purity of a sample. It is also highly reliable for identifying the following:

  • Base polymer composition
  • Additives
  • Organic contaminants
  • General type of material being analyzed when there are unknowns

Analyzing Samples in a Variety of Forms

  • Solids placed on a crystal
  • Liquids placed between two sodium chloride plates
  • Thin film placed in a cassette
  • Powdered sample mixed with potasium bromide and placed in a pellet

The Test Process

FTIR Analysis can be accomplished by Attenuated Total Reflectance (ATR), Nujol and thin film. Enough sample is required to obtain an absorption spectrum during the FTIR test. Solid samples are usually prepared by shaving some material off of the sample that is thin enough to obtain a good spectrum.

The first step is to collect a background spectra that can be subtracted from the test spectra. This will ensure that the actual sample is all that is analyzed.

Next, the sample is analyzed by LTI’s fully-computerized Fourier Transform Infrared Spectroscopy (FTIR) system. This generates the absorbance spectra showing the unique chemical bonds and the molecular structure of the sample material.

This profile is in the form of an absorption spectrum which shows peaks representing components in higher concentration. Absorbance peaks on the spectrum indicate functional groups (e.g. alkanes, ketones, acid chlorises). Different types of bonds, and thus different functional groups, absorb infrared radiation of different wavelengths.

Although the analysis is performed in absorbance, it can be easily converted to transmittance using a standard formula.

The analytical spectrum is then compared in a reference library program with cataloged spectra to identify components or to find a “best match” for unknown material using the cataloged spectra for known materials.

See the process in our FTIR Analysis Video below.

Additional Chemistry Services from LTI

FTIR Spectroscopy Analysis compliments the wide-range of instrumental and wet chemistry services performed at LTI for materials characterization, qualitative and quantitative element analysis and failure analysis on a variety of materials including metals, powdered metals, ores, ferroalloys, composites and ceramics. Laboratory Testing Inc. is fully capable of preparing test specimens for all analysis.

LTI Capabilities

  • Identification of organic, polymeric, and some inorganic materials, including sample composition, additives, contaminants and unknown materials
  • Qualitative and quantitative results
  • Absorbance and transmittance information is available
  • Library of reference spectra

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