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

• The library match quality is very weak: the reported top candidate and the rest of the Top-15 all show non-discriminating similarity values.
• The current peak set does not provide clear confirming evidence for a chlorinated polymer assignment, S-O a vinyl chloride-based conclusion would be too specific.
• The carbonyl type is not resolved from the present peak list alone.
• The broad 3362 cm-1 feature could arise from hydroxyl content, moisture, or surface contamination.
• The 676 cm-1 band is insufficient to determine whether halogen substitution is truly present.
• Without stronger library agreement or corroborating reference evidence, the sample cannot be confidently assigned to the named library material.

Recommended next steps: Re-run the FTIR spectrum with improved signal quality and baseline treatment, especially in the fingerprint region below 1500 cm-1. Check whether the 3362 cm-1 band persists after drying or purging; if it decreases, moisture interference is likely. Inspect the 1800-1500 cm-1 region at higher quality to refine the carbonyl assignment and determine whether the 1710 cm-1 band is ester-like or from another carbonyl type. If a chlorinated polymer remains a possibility, verify with complementary elemental analysis such as XRF or EDS for chlorine.