15 CFR § 230.2 - Identification of Standard Reference Materials.

---
identifier: "/us/cfr/t15/s230.2"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "15 CFR § 230.2 - Identification of Standard Reference Materials."
title_number: 15
title_name: "Commerce and Foreign Trade"
section_number: "230.2"
section_name: "Identification of Standard Reference Materials."
chapter_name: "NATIONAL INSTITUTE OF STANDARDS AND TECHNOLOGY, DEPARTMENT OF COMMERCE"
subchapter_number: "B"
subchapter_name: "STANDARD REFERENCE MATERIALS"
part_number: "230"
part_name: "STANDARD REFERENCE MATERIALS"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "Sec. 9, 31 Stat. 1450, as amended; 15 U.S.C. 277. Interprets and applies sec. 7, 70 Stat. 959; 15 U.S.C. 275a."
regulatory_source: "41 FR 8472, Feb. 27, 1976, unless otherwise noted."
cfr_part: "230"
---


# 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.