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

Extent: E+W+S

(a)The mixing, milling or blending of—
(i)natural rubber; or
(ii)synthetic organic elastomers,
if carbon black is used.
(b)Any process which converts the product of a process falling within paragraph (a) into a finished product if related to a process falling within that paragraph.

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Source: https://www.legislation.gov.uk/uksi/1991/472/schedule/1/part/6/crossheading/section-68-processes-involving-rubber-2 (the official version)
Page: https://openlegislation.uk/environmental-protection-prescribed-processes-and-substances-regulations-1991/schedule-1/part-6/crossheading-section-68-processes-involving-rubber-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.