U164 RCRA waste code Toxic thyroid drug, thrown away unused.
- Free, no account
- Based on 40 CFR 261.33 and EPA guidance
- Nothing is stored
Find a federal hazardous waste code
U164, Methylthiouracil.
U-listed waste
Methylthiouracil
U-list unused product.
ComplyOnSiteIs U164 hazardous waste?
Yes, when the listing applies. U164 covers unused methylthiouracil that is thrown away, including off-specification product and qualifying residues. It is a U-listed waste, not an acute P-listed one, so the listing depends on the product and how it is discarded, not on a TCLP result alone.
When it applies, U164 is nonacute hazardous waste. On a required hazardous waste manifest, put U164 in Item 13. For VSQG exemptions and empty-container rules and pharmaceutical containers, follow the linked guides.
What does U164 cover?
This covers unused methylthiouracil thrown away pure or technical grade, or in a formulation where it is the only active ingredient. Off-specification batches, residues in non-empty containers and spill cleanup residues of those products count too. Inactive ingredients don't stop it being the only active ingredient.
- CAS
- 56-04-2
- Table entries
- Methylthiouracil; 4(1H)-Pyrimidinone, 2,3-dihydro-6-methyl-2-thioxo-
- Hazard codes in the record
- T (toxic)
- Rule
- 40 CFR 261.33(f)
Is methylthiouracil waste always U164?
| Code | When it fits |
|---|---|
| U164 | The unused chemical is thrown away, pure or technical grade or as the sole active ingredient. Qualifying product residues count too. |
| Characteristic waste (D001–D043) | A used chemical or a different formulation meets a hazardous waste characteristic. Any process listings that apply need assessing too. |
A listed unused product can also exhibit a characteristic, so both rows can apply. Having this chemical in a manufacturing waste doesn't make the waste U164. What counts is 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 applicable exclusion, exception or approved delisting.
Which codes sit beside U164?
| Code | What it is |
|---|---|
| U160 | Methyl ethyl ketone peroxide |
| U161 | Methyl isobutyl ketone |
| U162 | Methyl methacrylate |
| U163 | MNNG |
| U165 | Naphthalene |
| U166 | 1,4-Naphthoquinone |
| U167 | alpha-Naphthylamine |
| U168 | beta-Naphthylamine |
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