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RCRA waste code finder

U033 RCRA waste code Toxic gas that reacts with water, used in chemical synthesis.

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  • Based on 40 CFR 261.33 and EPA guidance
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U033, Carbonic difluoride.

  • U-listed waste

    Carbonic difluoride

U-list unused product.

Listed withU-listed waste

U-listed hazardous waste for unused carbonic difluoride, also called carbonyl fluoride, a toxic gas used in synthesis.

Is U033 hazardous waste?

Yes, when the listing applies. U033 covers the unused carbonic difluoride 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.

The table prints different hazard letters for these entries. An entry with no letter is toxic (T) under 261.33(f), so no letter doesn't mean no hazard. “Carbonic difluoride” has no letter, so it counts as T (toxic). “Carbon oxyfluoride (R,T)” is marked (R,T).

U033 is nonacute hazardous waste. On a required hazardous waste manifest, put U033 in Item 13. See VSQG exemptions and empty-container rules and pharmaceutical containers.

What does U033 cover?

This covers unused carbonic difluoride 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 carbonic difluoride counting as the sole active ingredient.

CAS
353-50-4
Table entries
Carbonic difluoride and Carbon oxyfluoride (R,T)
Printed hazard annotations
“Carbonic difluoride”: unmarked: T (toxic) by default; “Carbon oxyfluoride (R,T)”: (R,T).

Is carbonic difluoride waste always U033?

CodeWhen it fits
U033The 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 U033. 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 U033?

CodeWhat it is
U029Methyl bromide
U0304-Bromophenyl phenyl ether
U031n-Butyl alcohol
U032Calcium chromate
U034Chloral
U035Chlorambucil — a chemotherapy drug
U036Chlordane, alpha & gamma isomers — an insecticide
U037Chlorobenzene

Sources