[Code of Federal Regulations]
[Title 15, Volume 1]
[Revised as of January 1, 2002]
From the U.S. Government Printing Office via GPO Access
[CITE: 15CFR230.2]

[Page 368]
 
                  TITLE 15--COMMERCE AND FOREIGN TRADE
 
 CHAPTER II--NATIONAL INSTITUTE OF STANDARDS AND TECHNOLOGY, DEPARTMENT 
                               OF COMMERCE
 
PART 230--STANDARD REFERENCE MATERIALS--Table of Contents
 
                     Subpart A--General Information
 
Sec. 230.2  Identification of Standard Reference Materials.

    The SRM's are listed by category in SP 260 and by sequential number 
in the supplements. The number uniquely identifies a particular SRM. 
Renewals are indicated by the addition of a letter to the original 
number. Thus, 11a is the first, 11b the second, and 11c the third 
renewal of SRM 11, Basic Open-Hearth Steel, 0.2 percent carbon. In this 
way, a particular number or number and letter always represent a 
material of fixed or approximately fixed composition.