40 CFR § 63.9490 - What parts of my plant does this subpart cover?
---
identifier: "/us/cfr/t40/s63.9490"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 63.9490 - What parts of my plant does this subpart cover?"
title_number: 40
title_name: "Protection of Environment"
section_number: "63.9490"
section_name: "What parts of my plant does this subpart cover?"
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "C"
subchapter_name: "AIR PROGRAMS"
part_number: "63"
part_name: "NATIONAL EMISSION STANDARDS FOR HAZARDOUS AIR POLLUTANTS FOR SOURCE CATEGORIES"
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: "57 FR 61992, Dec. 29, 1992, unless otherwise noted."
cfr_part: "63"
---
# 63.9490 What parts of my plant does this subpart cover?
(a) This subpart applies to each new, reconstructed, or existing affected source at your friction materials manufacturing facility.
(b) The affected source covered by this subpart is each new, reconstructed, or existing solvent mixer (as defined in § 63.9565) at your friction materials manufacturing facility.
(c) A solvent mixer at your friction materials manufacturing facility is new if you commence construction of the solvent mixer after October 18, 2002. An affected source is reconstructed if it meets the definition of “reconstruction” in § 63.2, and reconstruction is commenced after October 18, 2002.
(d) A solvent mixer at your friction materials manufacturing facility is existing if it is not new or reconstructed.