RCRA Hazardous Waste Number
Methyl isobutyl ketone
Official source: 40 CFR Part 261 (eCFR)Hazard Basis
Listed - toxic
CAS Number
108-10-1
Regulation
40 CFR Part 261
Need recovery options for a U161 stream?
Map recovery routes for U161Unused commercial chemical products that are toxic when discarded, from acetone (U002) to solvents and manufacturing intermediates. The code applies to the unused chemical, not process waste containing it.
U codes cover UNUSED commercial chemical products being discarded - not process waste containing the chemical.
Off-spec, expired or surplus chemical inventory is the typical U-code stream; reclamation or reuse can remove it from the waste system entirely.
Container residues above empty-container thresholds carry the same U code.
Recognized recovery routes for this waste family, ranked by typical recovery tier. Which route fits depends on your specific stream — composition, volume and region.
Unused, on-spec chemical product that finds a user has never been discarded — redistribution, resale or return to the supplier keeps it out of the waste system entirely.
40 CFR 261.2(c)(3) Table 1 — commercial chemical products being reclaimedCommercial chemical products being reclaimed are not solid wastes: off-spec, expired or surplus inventory processed back to usable product exits hazardous waste regulation.
40 CFR 261.2(c)(3) Table 1 — commercial chemical products being reclaimedThese are the typical routes for the U list. Your stream's actual options depend on its composition and where it sits.
Get the ranked options for your streamLeave your work email. Our industrial desk sends verified company contacts with location-specific pricing and contract minimums for methyl isobutyl ketone — not generic benchmarks.
Reviewed by our industrial desk within 1 business day.
Deepen your understanding of industrial symbiosis and circular economy strategies.