U056 RCRA waste code Flammable solvent used in paint removers & nylon making.

Free, no account
Based on 40 CFR 261.33 and EPA guidance
Nothing is stored

U-listed waste
Cyclohexane

U-list unused product.

U-listed hazardous waste for unused cyclohexane, an ignitable solvent used in paint removers & nylon production.

Is U056 hazardous waste?

Yes, when the listing applies. U056 covers cyclohexane thrown away unused, including off-specification product and qualifying residues. It is a U-listed waste, not an acute P-listed one. The listing depends on the product and how it is discarded, not on a TCLP result alone.

This listing rests only on ignitability, corrosivity or reactivity. Under 261.3(g), it stops applying once the waste shows no hazardous characteristic. Another listing can still apply, and land disposal restrictions can continue.

U056 is nonacute hazardous waste. On a required hazardous waste manifest, put U056 in Item 13. VSQG exemptions and empty-container rules and pharmaceutical containers still apply.

What does U056 cover?

This covers cyclohexane discarded unused, either pure or technical grade or as the only active ingredient in a formulation. It also covers off-specification batches, residues in nonempty containers and spill cleanup residues of those products. Inactive ingredients in the formulation don't affect this.

CAS: 110-82-7
Table entries: Benzene, hexahydro- (I) or Cyclohexane (I) or Benzene, hexahydro-(I)
Hazard codes in the record: I (ignitable)
Rule: 40 CFR 261.33(f)

Is waste cyclohexane always U056?

Code	When it fits
U056	The unused chemical is thrown away, pure or technical grade or as the sole active ingredient. Residues from those products count too.
Characteristic waste (D001–D043)	A used chemical or a different formulation shows a hazardous characteristic. Process listings can apply too.

A listed unused product can also have a characteristic, so more than one row can apply. Merely finding this chemical in a manufacturing waste doesn't make it U056. Match the waste's origin, formulation and use history. Mixing listed waste with solid waste, or treating it, generally doesn't remove the listing. That takes an exclusion, an exception or an approved delisting.

Which wastes take U056?

Waste	When it’s U056
Unused cyclohexane	Discarded commercial product that is pure or technical-grade cyclohexane, or has cyclohexane as its sole active ingredient.

Which codes sit beside U056?

Code	What it is
U051	Creosote
U052	Cresol (cresylic acid)
U053	Crotonaldehyde
U055	Cumene
U057	Cyclohexanone
U058	Cyclophosphamide — a chemotherapy drug
U059	Daunomycin — a chemotherapy drug also called daunorubicin
U060	DDD — an insecticide related to DDT