U021 RCRA waste code Carcinogenic dye base, banned from most uses.
- Free, no account
- Based on 40 CFR 261.33 and EPA guidance
- Nothing is stored
Find a federal hazardous waste code
U021, Benzidine.
U-listed waste
Benzidine
U-list unused product.
ComplyOnSiteIs U021 hazardous waste?
Yes, when the listing applies. U021 covers the unused benzidine described below when it is discarded, 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.
U021 is nonacute hazardous waste. On a required hazardous waste manifest, put U021 in Item 13. See VSQG exemptions and empty-container rules and pharmaceutical containers.
What does U021 cover?
This covers unused benzidine discarded in pure or technical grade, or in a formulation where it is the only active ingredient. It also covers off-specification batches, residues in nonempty containers and spill cleanup residues from those products. Inactive ingredients don't stop benzidine counting as the sole active ingredient.
- CAS
- 92-87-5
- Table entries
- Benzidine; [1,1′-Biphenyl]-4,4′-diamine
- Hazard codes in the record
- T (toxic)
- Rule
- 40 CFR 261.33(f)
Is benzidine waste always U021?
| Code | When it fits |
|---|---|
| U021 | The unused chemical is discarded as a pure or technical grade product or as the sole active ingredient. Residues from that product also count. |
| Characteristic waste (D001–D043) | A used chemical or a different formulation meets a hazardous-waste characteristic. Check any process listings that apply too. |
Both can apply, since a listed unused product can also show a characteristic. Having this chemical in a manufacturing waste doesn't make the waste U021. Match the waste's origin, formulation and use history. Mixing listed waste with solid waste, or treating it, doesn't normally remove the listing. Only an exclusion, an exception or an approved delisting does.
Which codes sit beside U021?
| Code | What it is |
|---|---|
| U017 | Benzal chloride |
| U018 | Benz[a]anthracene |
| U019 | Benzene |
| U020 | Benzenesulfonyl chloride |
| U022 | Benzo[a]pyrene |
| U023 | Benzotrichloride |
| U024 | Dichloromethoxy ethane |
| U025 | Dichloroethyl ether |
Sources
- 40 CFR 261.33 — Discarded commercial chemical products, off-specification species, container residues, and spill residues thereof
- 40 CFR 261.3 — Definition of hazardous waste
- 40 CFR 261.7 — Residues of hazardous waste in empty containers
- 40 CFR 260.10 — Definitions
- 40 CFR 262.14 — Conditions for exemption for a very small quantity generator
- 40 CFR 262.20 — General requirements
- 40 CFR 266.507 — Residues of hazardous waste pharmaceuticals in empty containers
- Hazardous Waste Manifest Instructions