CFR › Title 40 › Part 63 › §63.6040 CFR §63.60Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy linkThe substance caprolactam (CAS number 105602) is deleted from the list of hazardous air pollutants established by 42 U.S.C. 7412(b)(1).