RCRA waste codes for spent solvents Used degreasers & thinners, from acetone to chlorinated cleaners.

F-listed waste
Spent halogenated solvents used for degreasing
Solvent in spent solvents removed oil or grease and meets F001 composition conditions
When to use F001
F-listed waste
Spent halogenated solvents
Used solvent in spent solvents meets F002 before-use conditions regardless of degreasing use
When to use F002
F-listed waste
Spent non-halogenated solvents: acetone, xylene and related solvents
The spent-solvent component of spent solvents meets F003 neat-solvent or blend conditions
When to use F003
F-listed waste
Spent cresol, cresylic acid and nitrobenzene solvents
The original solvent recipe for spent solvents meets F004's named-solvent or blend test
When to use F004
F-listed waste
Spent toluene, methyl ethyl ketone (MEK) and related solvents
Before-use ingredients of solvent in spent solvents satisfy F005 composition conditions
When to use F005
Characteristic hazardous waste
Ignitable waste
A representative sample of spent solvents meets the D001 test for its physical form
When to use D001

K-listed waste
Organic waste from making carbamates or carbamoyl oximes
When to use K156

Listed F codes. Halogenated degreasers are F001 & F002, acetone, xylene & cresol solvents F003 to F005.

Which RCRA codes apply to spent solvents?

Code	When it applies
F001	Used to remove oil or grease, and meets the F001 composition conditions
F002	Meets the F002 before-use conditions, whether or not it was used for degreasing
F003	The solvent component meets the F003 neat-solvent or blend conditions
F004	The original recipe meets F004's named-solvent or blend test
F005	The before-use ingredients meet the F005 composition conditions
D001	A representative sample meets the D001 test for its physical form

Keep the formulation from before use. A test of the spent liquid can't prove it.

Check the Loss-of-characteristic rule for another route.