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10 02 13* Sludges and filter cakes 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: “sludges and filter cakes from gas treatment containing hazardous substances”

Where it sits: chapter 10 (wastes from thermal processes), section 10 02 (wastes from the iron and steel industry).

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 02 14 Sludges and filter cakes from gas treatment other than those mentioned in 10 02 13 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 02

10 02 01 Wastes from the processing of slag Not hazardous
10 02 02 Unprocessed slag Not hazardous
10 02 07* Solid wastes from gas treatment containing hazardous substances Hazardous
10 02 08 Solid wastes from gas treatment other than those mentioned in 10 02 07 Not hazardous
10 02 10 Mill scales Not hazardous
10 02 11* Wastes from cooling-water treatment containing oil Hazardous
10 02 12 Wastes from cooling-water treatment other than those mentioned in 10 02 11 Not hazardous
10 02 14 Sludges and filter cakes from gas treatment other than those mentioned in 10 02 13 Not hazardous
10 02 15 Other sludges and filter cakes Not hazardous
10 02 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.