# Landfill Disposals Tax (Wales) Act 2017, Paragraph 8


The material in Group 4 comprises only—
(a) vitrified wastes and residues from the thermal processing of minerals where the wastes or residues are both fused and insoluble;
(b) slag from waste incineration.

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Source: https://www.legislation.gov.uk/anaw/2017/3/schedule/1/paragraph/8 (the official version)
Page: https://openlegislation.uk/landfill-disposals-tax-wales-act-2017/schedule-1/paragraph-8
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.