This Draft Uganda Standard, DUS , is based on ASTM E – . ASTM Standards volume information, refer to the standard’s Document Summary . Fourier Transform Infrared Spectrometry ASTM E, ASTM E FTIR can generate an infrared spectral scan of samples that absorb infrared light. Scope. ASTM E – FTIR ANALYSIS TESTING SERVICES – ASTM E is a method of identifying organic compounds by FTIR analysis.
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Enabling you to identify and mitigate the intrinsic risk in your operations, supply chains and business processes. Evaluating how your products and services meet and exceed quality, safety, sustainability and performance standards.
Validating the specifications, value and safety of your raw materials, products and assets.
Formally confirming that your products and services meet all trusted external and internal standards. FTIR can generate an infrared spectral scan of samples that absorb infrared light. If aastm material does not absorb infrared light a spectral scan cannot be obtained. FTIR is the first logical step in identifying a polymer.
ASTM E1252 – 98(2013)e1
FTIR is also used for quality control of materials and for contamination analysis surface or internal. The resulting spectral scan absorbance or transmittance is usually specific to a general class of material.
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. A typical infrared scan is generated in the mid-infrared region of the light spectrum. The mid-infrared region is from to wavenumbers, which equals wavelengths of 2. Matching the unknown infrared spectrum to known spectra can be done manually or with the help of a computerized program.
Computerized spectral searches can quickly compare an unknown spectrum to a very large number of spectra located in multiple databases in a very short period of time. Computerized spectral matches to the unknown spectral scan are presented from best to worst with assigned certainty ratings. Computer programs are very helpful for comparing unknown spectral scans to those of known materials, but computer selected matches can be misleading.
A skilled FTIR analyst is needed to examine the computer selected spectral matches to ensure that sample identifications are both accurate and complete. Computer matching programs have difficulties with subtle differences that can be critically important.
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.
Materials with large quantities of carbon carbon black or carbon fiber are difficult to obtain a usable spectral scan from because carbon strongly absorbs infrared light in a broad range of frequencies. This results in an FTIR spectrum without the minute details necessary to identify the unknown material. The better the match, the higher the certainty for a correct identification of the unknown polymer. However, an FTIR spectral scan alone should not be expected to identify the type of Nylon or Polyester, identify a Polypropylene or Acetal as a homopolymer or copolymer, or determine whether the Polyethylene is a high density or low density material.
Further identification may be aided by DSC. Further identification may be aided by an Ash Test.
Fourier Transform Infrared Spectrometry ASTM E, ASTM E
A ast scan of a reference material can be generated and stored in a spectral library database. A stored reference scan will allow all future material scans to be compared back to the same earlier scan. The objective is to look for material differences. Differences noted in a newly generated spectral scan could indicate a change in processing or a possible contamination problem. FTIR spectral subtractions are used to look for internal contamination in polymers.
A computer program is used to subtract the peaks associated with the base polymer from the spectral scan and then an analysis of the remaining spectral scan is performed.
The amount of contamination that can be detected depends on the spectral scans of the base polymer and the contaminant. Obvious surface contamination of polymers can be analyzed by normal reflective FTIR because the infrared beam only enters a few microns w1252 the sample surface. A solvent wash involves using a solvent that is nondestructive to the sample. Once the solvent is evaporated off an FTIR analysis is performed on the solvent wash residue. Standards can be obtained from appropriate standards authorities.
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