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A4090 Basel waste code Spent acids & caustic solutions, other than List B items.

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  • Based on ECCC's classification guide and SOR/2021-25
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A4090, Acidic or alkaline solution outside List B.

  • Basel List A codes

    Acidic or alkaline solution outside List B

Use A4090 for acidic or alkaline solution outside List B as a presumptively hazardous Basel waste.

Listed withBasel List A codes

Basel List A waste of acidic or basic solutions, apart from the acid or caustic solutions named on List B.

Is Basel A4090 hazardous waste?

Normally yes. Basel A4090 is a List A description, so the material counts as hazardous unless evidence shows it has no Annex III hazardous characteristic. The description and any exclusions still have to match.

For federally regulated international shipments, the applicant enters the waste classification in the waste-line details of the federal notification in CNMTS. Check the movement rules and exclusions.

What does Basel A4090 cover?

Covers discarded acidic and basic solutions, except those assigned to the matching List B entry. Compare B2120.

Official wording
Read the official entry

Is waste acid or alkali Basel A4090 or List B?

CodeWhen it fits
A4090Discarded acidic and basic solutions, except those assigned to the matching List B entry. Compare B2120.

Pick the entry whose description and conditions match the waste. The code classifies the waste. It doesn't settle whether SOR/2021-25 applies, what it excludes, what the destination country controls or the intended operation.

Which codes sit beside Basel A4090?

CodeWhat it is
A4050Cyanide-bearing waste
A4060Oil or hydrocarbon mixed with water
A4070Ink, dye, pigment, paint or finish process waste
A4080Explosive waste outside List B
A4100Industrial off-gas control waste
A4110Polychlorinated dioxin or furan waste
A4120Peroxide-bearing waste
A4130Hazardous contaminated packages and containers

Sources