• Top library match: Polypropylene #6271

• The library’s top‑1 candidate is polypropylene, but the confidence is only 15 % and the spectral differences (presence of strong amide and broad C–O bands) are inconsistent with pure polypropylene; therefore, the sample cannot be identified as standard polypropylene.
• Several peak‑candidate assignments that refer to PVDF phases, specific inorganic oxides, or boron nitride structures are chemically incompatible with the hydrocarbon‑dominated, oxygen‑containing spectrum observed here.
• The low library match and the coexistence of aromatic, methoxy, and amide features in a mainly aliphatic spectrum make a definite material assignment difficult; the broad material direction is based on functional‑group interpretation rather than a specific entity.
• The aromatic assignments (898 and 997 cm⁻¹) rely on single literature sources and require confirmation from ring‑stretching bands (∼1600 cm⁻¹) which are obscured by the amide I signal.
• The tentative identification of a siliceous component at 807 cm⁻¹ could not be corroborated by other metal–oxygen bands and remains speculative.

Recommended next steps: Perform complementary analysis using pyrolysis‑GC/MS or NMR to resolve the molecular structure of the unknown material and to differentiate between a functionalized polyolefin and a multi‑component blend. Acquire a high‑quality far‑infrared spectrum (below 700 cm⁻¹) to search for characteristic aromatic or inorganic lattice vibrations that would support the proposed aromatic and siliceous assignments. If possible, compare the spectrum with reference libraries of polypropylene‑graft polymers or ethylene‑propylene copolymers containing aromatic functional groups to improve the library match.