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10 13 12* Solid wastes from gas treatment containing hazardous substances

EWC / List of Waste code · Last checked 21 October 2026 · Applies across the UK (England, Wales, Scotland and Northern Ireland)

Hazardous Mirror entry (hazardous side)

Official description: “solid wastes from gas treatment containing hazardous substances”

Where it sits: chapter 10 (wastes from thermal processes), section 10 13 (wastes from manufacture of cement, lime and plaster and articles and products made from them).

What the hazard status means

This is one half of a “mirror” pair. Use this hazardous code if the waste contains hazardous substances above the thresholds, or has hazardous properties. You must assess the waste first, usually by knowing exactly what it is made of or by sampling and testing it.

Its mirror entry

10 13 13 Solid wastes from gas treatment other than those mentioned in 10 13 12 Not hazardous

Using this code

Write the code on the paperwork when waste is passed on: a waste transfer note for non-hazardous waste, or a consignment note for hazardous waste (called special waste in Scotland).
Choose the code from where the waste came from first (the chapter), then what it is. If a load is mixed, you may need more than one code.
The waste must go to a site whose permit allows that code. A registered carrier can tell you which codes they accept: check a waste carrier.
Businesses have a duty of care to describe their waste correctly.

Other codes in section 10 13

10 13 01 Waste preparation mixture before thermal processing Not hazardous
10 13 04 Wastes from calcination and hydration of lime Not hazardous
10 13 06 Particulates and dust (except 10 13 12 and 10 13 13) Not hazardous
10 13 07 Sludges and filter cakes from gas treatment Not hazardous
10 13 09* Wastes from asbestos-cement manufacture containing asbestos Hazardous
10 13 10 Wastes from asbestos-cement manufacture other than those mentioned in 10 13 09 Not hazardous
10 13 11 Wastes from cement-based composite materials other than those mentioned in 10 13 09 and 10 13 10 Not hazardous
10 13 13 Solid wastes from gas treatment other than those mentioned in 10 13 12 Not hazardous
10 13 14 Waste concrete and concrete sludge Not hazardous
10 13 99 Wastes not otherwise specified Not hazardous

This page explains the code in plain English. It is not a classification of your waste. The official List of Waste and the classification guidance decide which code applies, and you are responsible for the code you use.