Test standards Alpine supports: ASTM D3677, ASTM E168, & ASTM E1252
Fourier Transform Infrared Spectroscopy (FTIR) is a rapid analytical method used to identify a material’s chemical makeup by analyzing how it interacts with infrared light. At Alpine Polytech, we offer Attenuated Total Reflectance (ATR), an FTIR method that allows for straightforward and non-destructive testing on elastomers, plastics, and composites. FTIR can be used for a range of analytical needs, including failure analysis, contamination identification, and material verification. In failure analysis, FTIR can help determine if a material mismatch, contamination, or chemical degradation contributed to a component’s failure. It is also valuable for identifying unknown materials from legacy parts and ensuring that materials received from suppliers match specified formulations.
FTIR is an effective first step for material identification and contamination analysis. The test is fast, requires no destructive sample preparation, and is highly sensitive to trace materials within the sample. However, as the scan penetrates only a few micrometers into the surface, it may not provide comprehensive information for layered or heavily filled materials. If deeper or more detailed compositional analysis is needed, Thermogravimetric Analysis (TGA) is typically performed as the next step to complement FTIR results.
Testing Details
ASTM E168: General methods for infrared qualitative analysis.
ASTM E1252: Standard practice for general techniques in mid-infrared analysis.
ASTM D3677: Identification of rubber using infrared spectrophotometry.
During testing, a beam of infrared light is passed through a crystal in contact with the sample. The beam of light is either absorbed or reflected off the material depending on its chemical composition and bonds. A variety of samples can be measured with minimal preparation time in the form of solids, liquids, and powders. As the broad wavelengths of infrared light interact with the sample, specific wavelengths are absorbed by the chemical bonds within the material while others are reflected, generating a unique “fingerprint” spectrum. By comparing the fingerprint to known reference spectra, we can determine the material family or verify if a sample aligns with an expected compound or formulation. An example of this reference is shown below.
