Code of Federal Regulations > Title 40 > Chapter I > Part 63 > Subpart TTTT > Appendix - Table 1 to Subpart TTTT of Part 63—Leather Finishing HAP Emission Limits for Determining the Allowable HAP Loss

Regulations last checked for updates: Dec 12, 2025

Title 40 - Protection of Environment last revised: Nov 12, 2028

Appendix - Table 1 to Subpart TTTT of Part 63—Leather Finishing HAP Emission Limits for Determining the Allowable HAP Loss

As required in §§ 63.5305 and 63.5340(b), you must meet the appropriate emission limits in the following table:

Type of Leather Product Process Operation	HAP Emission Limit (pounds of HAP loss per 1,000 square feet of leather processed)
Type of Leather Product Process Operation	Existing sources	New sources
1. Upholstery Leather (≥4 grams add-on/square feet)	2.6	0.5
2. Upholstery Leather (<4 grams add-on/square feet)	6.8	2.5
3. Water-resistant (≥5,000 Maeser Flexes)/Specialty Leather	5.6	4.9
4. Nonwater-resistant Leather (<5,000 Maeser Flexes)	3.7	2.1

authority: 42 U.S.C. 7401

source: 57 FR 61992, Dec. 29, 1992, unless otherwise noted.