Fourier Transform Infrared
Spectroscopy (FTIR) identifies
chemical bonds in a molecule by
producing an infrared absorption
spectrum. The FTIR generates an
infrared spectral scan of samples
that absorb infrared light. Metals
do not absorb infrared light, but
polymers that contain metals can
be scanned with FTIR.
Fourier Transform Infrared
Spectroscopy (FTIR) identifies
chemical bonds in a molecule by
producing an infrared absorption spectrum.
FTIR is important for screening,
and identifying polymer or plastic
samples. See below for Analysis applications
A material’s absorbance of infrared light at different frequencies produces a unique identification
based upon the frequencies at which the material absorbs infrared light and the intensity of those
absorptions. The resulting spectral scan is typically specific to a general class of material.
Example: Nylon scans have unique similarities but are definitively different than Polycarbonate
scans.
Unknown spectral scans can be analyzed to determine the base material of the unknown by comparing
their scan to spectral scans of known materials that are stored in a computer-based library
The resulting spectra produce a profile of the sample, a unique molecular “fingerprint” can be used to
easily screen and scan samples for many different components. FTIR is an effective analytical instrument
for detecting functional groups and characterizing materials.
Samples the size of a single resin pellet can be scanned by reflective FTIR. Samples, which can be easily
tested by reflective FTIR, include polymer pellets, parts, opaque samples, fibers, powders, wire coatings,
and liquids.
An FTIR spectral analysis can easily identify classes of polymers such as Nylons, Polyesters, Polypropylenes, Polycarbonates, Polyurethanes, Acetals, or Polyethylenes.
FTIR spectral scan alone may not identify the type of Nylon, Pebex, or Polyester, identify a Polypropylene
or Acetal as a homopolymer or copolymer, or determine whether a Polyethylene is a high density or low
density material. Further identification using other analytical techniques is necessary.
FTIR Analysis Applications:
Quantitative Scans
Qualitative Scans
Solids, Films, Liquids
Organic Samples
Inorganic Samples
Plastics
Polymers
Contamination identification
Impurities Screening
Formulation, Deformulaation
Packaging materials, foams, films, bubble wrap
Medical devices, tubing, coatings, adhesives
Personal care products, Cosmetics
Consumer goods
Toys
Household products
Building Products
Your Expert
Associated Polymer Labs, Inc. is an established laboratory founded in February 1999. Their commitment is to help their clients and associates find the right answers to their manufacturing problems. They are confident that their experience in polymer science and plastics engineering earns respect and reliability of the services they provide. They maintain that good corporate citizenship is crucial to the protection of integrity with their clients.
