40 CFR § 60.617a - What are the chemicals that I must produce to be affected by subpart IIIa?

---
identifier: "/us/cfr/t40/s60.617a"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 60.617a - What are the chemicals that I must produce to be affected by subpart IIIa?"
title_number: 40
title_name: "Protection of Environment"
section_number: "60.617a"
section_name: "What are the chemicals that I must produce to be affected by subpart IIIa?"
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "C"
subchapter_name: "AIR PROGRAMS"
part_number: "60"
part_name: "STANDARDS OF PERFORMANCE FOR NEW STATIONARY SOURCES"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "42 U.S.C. 7401"
regulatory_source: "36 FR 24877, Dec. 23, 1971, unless otherwise noted."
cfr_part: "60"
---


# 60.617a What are the chemicals that I must produce to be affected by subpart IIIa?

| Chemical name | CAS No.* |
| --- | --- |
| Acetaldehyde | 75-07-0 |
| Acetic acid | 64-19-7 |
| Acetone | 67-64-1 |
| Acetonitrile | 75-05-8 |
| Acetophenone | 98-86-2 |
| Acrolein | 107-02-8 |
| Acrylic acid | 79-10-7 |
| Acrylonitrile | 107-13-1 |
| Anthraquinone | 84-65-1 |
| Benzaldehyde | 100-52-7 |
| Benzoic acid, tech | 65-85-0 |
| 1,3-Butadiene | 106-99-0 |
| p-t-Butyl benzoic acid | 98-73-7 |
| N-Butyric acid | 107-92-6 |
| Crotonic acid | 3724-65-0 |
| Cumene hydroperoxide | 80-15-9 |
| Cyclohexanol | 108-93-0 |
| Cyclohexanone | 108-94-1 |
| Dimethyl terephthalate | 120-61-6 |
| Ethylene dichloride | 107-06-2 |
| Ethylene oxide | 75-21-8 |
| Formaldehyde | 50-00-0 |
| Formic acid | 64-18-6 |
| Glyoxal | 107-22-2 |
| Hydrogen cyanide | 74-90-8 |
| Isobutyric acid | 79-31-2 |
| Isophthalic acid | 121-91-5 |
| Maleic anhydride | 108-31-6 |
| Methyl ethyl ketone | 78-93-3 |
| a-Methyl styrene | 98-83-9 |
| Phenol | 108-95-2 |
| Phthalic anhydride | 85-44-9 |
| Propionic acid | 79-09-4 |
| Propylene oxide | 75-56-9 |
| Styrene | 100-42-5 |
| Terephthalic acid | 100-21-0 |
| * CAS numbers refer to the Chemical Abstracts Registry numbers assigned to specific chemicals, isomers, or mixtures of chemicals. Some isomers or mixtures that are covered by the standards do not have CAS numbers assigned to them. The standards apply to all of the chemicals listed, whether CAS numbers have been assigned or not. |  |