# The Environmental Protection (Prescribed Processes and Substances) Regulations 1991, 

Extent: E+W+S

(a)The curing or chemical treatment as part of a manufacturing process of timber or of products wholly or mainly made of wood if any substance described in Schedule 5 is used.
(b)...

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Source: https://www.legislation.gov.uk/uksi/1991/472/schedule/1/part/6/crossheading/section-67-timber-processes-1 (the official version)
Page: https://openlegislation.uk/environmental-protection-prescribed-processes-and-substances-regulations-1991/schedule-1/part-6/crossheading-section-67-timber-processes-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.