This book provides an exploratory, explanatory and normative account of REACH, the EU Regulation on the Registration, Evaluation, Authorisation and Restriction of Chemicals, and its regulator, the European Chemicals Agency (ECHA). There are more than one million words of official ECHA guidance to accompany the 516 pages of REACH. This book sets out a thick, detailed analysis of REACH and ECHA's guidance and, in so doing, offers up a complex, nuanced and differentiated account of hybrid new governance.