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

Extent: E+W+S

(a)Any process for the manufacture of any di-isocyanate or a partly polymerised di-isocyanate.
(b) Any manufacturing process involving the use of toluene di-isocyanate or partly polymerised toluene di-isocyanate if—
(i)1 tonne or more of toluene di-isocyanate monomer is likely to be used in any 12 month period; and
(ii)the process may result in a release into the air which contains toluene di-isocyanate.
(c)...
(d) The flame bonding of polyurethane foams or polyurethane elastomers, and the hot wire cutting of such substances where such cutting is related to any other Part A process.

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Source: https://www.legislation.gov.uk/uksi/1991/472/schedule/1/part/6/crossheading/section-62-diisocyanale-processes-1 (the official version)
Page: https://openlegislation.uk/environmental-protection-prescribed-processes-and-substances-regulations-1991/schedule-1/part-6/crossheading-section-62-diisocyanale-processes-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.