FTIR analysis centers around using light in the infrared spectrum to excite molecules and examine the absorbance rate (or, conversely, transmittance rate) to determine structure and identity. As FTIR is a relatively quick process with broad relevance to many molecules, it helps to form the basis of any material lab investigation into samples of known and unknown compositions.
FTIR Analysis at LTI
An FTIR test is used to assess the purity of some inorganic samples and is highly reliable for identifying polymer composition. FTIR is an excellent general-purpose investigative tool, as it can indicate the amount of material present, making it highly suitable for qualitative analysis.
The Chemistry Lab at Laboratory Testing Inc. performs FTIR analysis with a computerized spectrometer to scan test samples and observe chemical properties. FTIR analysis is a molecular analysis; the test method provides information about the sample material’s molecular structure, not the individual atoms. FTIR tests output an absorbance spectrum that shows the distinct chemical bonds of the sample.
Analyzing Samples in a Variety of Forms
The sample absorbs some radiation during testing, and the rest passes through. Based on the frequencies absorbed, a computational model can work backward using qualitative information to conclude all or part of the sample’s identity. Our FTIR testing lab can analyze solid, liquid, powder, or thin film samples using the following sample preparations:
- Solids placed on a crystal (ATR)
- Liquids placed between two sodium chloride plates (Nujol)
- A thin film set in a cassette
- A powdered sample mixed with potassium bromide and placed in a pellet (KBr pellet)
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
Our Infrared Analysis Is a Green Light for Material Approvals
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Laboratory Testing Inc. has the capacity and capabilities to handle all your material testing needs in a single location. Since 1984, we’ve aided customers worldwide with accurate nondestructive testing and precise material lab services. Request a quote or contact us today to see how our industry-leading turnaround times can keep your mission-critical approvals moving forward.