[Code of Federal Regulations] [Title 40, Volume 28] [Revised as of July 1, 2003] From the U.S. Government Printing Office via GPO Access [CITE: 40CFR721.50] [Page 157] TITLE 40--PROTECTION OF ENVIRONMENT CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) PART 721--SIGNIFICANT NEW USES OF CHEMICAL SUBSTANCES--Table of Contents Subpart B--Certain Significant New Uses Sec. 721.50 Applicability. Source: 54 FR 31308, July 27, 1989, unless otherwise noted. This subpart B identifies certain significant new uses of chemical substances identified in subpart E of this part. The provisions of this subpart B apply only when referenced as applying to a chemical substance identified in subpart E of this part.