EPA Method 318

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EPA Method 318:
Extractive FTIR Method for the Measurement of Emissions from the Mineral Wool and Wool Fiberglass Industries

Molecules are composed of chemically bonded atoms, which are in constant motion. The atomic motions result in bond deformations (bond stretching and bond-angle bending). The number of fundamental (or independent) vibrational motions depends on the number of atoms (N) in the molecule. At typical testing temperatures, most molecules are in the ground-state vibrational state for most of their fundamental vibrational motions. A molecule can undergo a transition from its ground state (for a particular vibration) to the first excited state by absorbing a quantum of light at a frequency characteristic

This method has been validated and approved for mineral wool and wool fiberglass sources. This method may not be applied to other source categories without validation and approval by the Administrator according to the procedures in Test Method 301, 40 CFR Part 63, Appendix A. For sources seeking to apply FTIR to other source categories, Test Method 320 (40 CFR Part 63, Appendix A) may be utilized.