Infrared Spectroscopy (IR)

Infrared spectroscopy is a laboratory technique that identifies materials by shining infrared light through or onto a sample and measuring which wavelengths the sample absorbs. Each mineral and chemical compound has a characteristic absorption pattern, a kind of molecular fingerprint, that can be matched against reference spectra. In asbestos work, IR (most often as FTIR, Fourier Transform Infrared) is used to identify and sometimes quantify asbestos minerals in bulk products like insulation, joint compound, and floor tile.

Origin

The term combines Latin infra ("below") with "red," describing light just below the red end of the visible spectrum, and Greek spektron ("image") with skopein ("to look at"). Infrared absorption was first observed by William Herschel in 1800, and the modern Fourier Transform Infrared (FTIR) instrument became standard in materials laboratories in the 1970s and 1980s, including for asbestos analysis under EPA and OSHA methods.

Significance in Asbestos Context

For a patient, IR results can be the scientific link between a specific product they worked with, or lived near, and the asbestos that caused their disease. Laboratories use FTIR to confirm whether a bulk sample of insulation, gasket, cement, or joint compound actually contains chrysotile, amosite, crocidolite, or other regulated fibers, and to estimate the percentage present. This matters because product identification (PID) drives which manufacturers can be named in a claim; an FTIR report on a retained product sample, or on archived material from a worksite, can corroborate testimony about what someone was exposed to. IR is most powerful for bulk product identification; it does not analyze individual fibers in lung tissue, which is done by electron microscopy.

Example Sentence

The plaintiff's expert sent a piece of pipe insulation saved from a 1970s shipyard job to a lab, and the FTIR analysis confirmed it contained roughly 15% amosite asbestos.

Related Terms

Fourier Transform Infrared Spectroscopy (FTIR), Polarized Light Microscopy (PLM), X-Ray Diffraction (XRD), Transmission Electron Microscopy (TEM), Bulk Sample Analysis, Product Identification

Notes

• If you or your family kept any physical samples of suspected asbestos products (insulation chunks, gaskets, tile fragments, joint compound), preserve them in sealed bags and tell your legal team before discarding. FTIR can test them years later.
• Ask whether the testing laboratory is accredited by NVLAP (National Voluntary Laboratory Accreditation Program) for bulk asbestos analysis; accreditation strengthens the evidentiary weight of the report.
• IR/FTIR is typically used alongside PLM and sometimes XRD or electron microscopy; a complete report should name the methods used and the specific asbestos minerals identified, not just "asbestos positive."
• For low-concentration products (such as some joint compounds and vinyl floor tiles), ask whether the lab used a method sensitive enough to detect trace asbestos, since older PLM-only methods sometimes missed it.