• Top library match: Vinyl chloride/vinyl acetate copolymer #322

• The nearest library result has zero reported similarity, S-O the library hit itself is not strong evidence for the specific named material.
• No related-literature evidence was recovered to support the specific copolymer assignment.
• The spectrum shows prominent O-H absorption, which is not by itself a distinguishing pattern for the named vinyl chloride/vinyl acetate copolymer and may indicate additives, degradation products, contamination, or a different oxygenated material.
• The carbonyl band at 1728 cm-1 is not specific enough to distinguish among ester-containing polymer, oxygenated small molecule, oxidized organic residue, or mixed-material sample.
• The 1595, 1526, and 1653 cm-1 region is not sufficiently constrained by the available evidence and may reflect aromatic, unsaturated, or other coupled vibrations.
• Because the leading library candidates are chemically diverse and all reported with essentially no match strength, the present data do not justify an entity-level assignment.

Recommended next steps: Re-run FTIR on a cleaned, dry sample to determine whether the broad O-H region decreases, which would help distinguish intrinsic hydroxyl functionality from adsorbed moisture or surface contamination. Inspect the 600-800 cm-1 region at higher quality to check for characteristic C-Cl-related absorption if a vinyl chloride-containing material is still being considered. Compare replicate spectra from different spots on the sample to test for heterogeneity or surface coating effects. If available, use complementary methods such as Raman, pyrolysis-GC/MS, or elemental analysis for chlorine content to evaluate whether a vinyl chloride-containing polymer is actually present.