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Blast furnace slag (BFS)

This slag material can be used as an aggregate. We introduced it into the Waste Protocols Project shortly before Europe issued guidance on how to determine whether materials were by-products, rather than wastes. We used the work we had completed to help the industry successfully demonstrate that blast furnace slag should be classed as a by-product.

What are the benefits?

Blast furnace slag can now be used as an aggregate without any waste management control. We stopped investigations into this waste stream before completing a financial impact assessment but we know that this gives the construction industry easier access to more than three million tonnes of the material produced annually.

The current status

This Waste Protocols Project has completed its work in relation to blast furnace slag.

Find out how we regulate blast furnace slag.

Get involved

If you are interested in using aggregate produced from blast furnace slag contact AggRegain.

More information

If you would like further help, please email wasteprotocols@environment-agency.gov.uk