40 CFR § 63.5752 - How do I calculate the organic HAP content of aluminum recreational boat surface coatings?

---
identifier: "/us/cfr/t40/s63.5752"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 63.5752 - How do I calculate the organic HAP content of aluminum recreational boat surface coatings?"
title_number: 40
title_name: "Protection of Environment"
section_number: "63.5752"
section_name: "How do I calculate the organic HAP content of aluminum recreational boat surface coatings?"
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"
---


# 63.5752 How do I calculate the organic HAP content of aluminum recreational boat surface coatings?

(a) Use equation 1 of this section to calculate the weighted-average HAP content for all aluminum surface coatings used in the past 12 months.

Where:

HAP<sub>SC</sub> = weighted-average organic HAP content for all aluminum coating materials, kilograms of organic HAP per liter of coating solids.

m = number of different aluminum primers, top coats, and clear coats used in the past 12 months.

Vol<sub>i</sub> = volume of aluminum primer, top coat, or clear coat i used in the past 12 months, liters.

D<sub>i</sub> = density of coating i, kilograms per liter.

W<sub>i</sub> = mass fraction of organic HAP in coating i, kilograms of organic HAP per kilogram of coating.

p = number of different thinners, activators, and other coating additives used in the past 12 months.

Vol<sub>k</sub> = total volume of thinner, activator, or additive k used in the past 12 months, liters.

D<sub>k</sub> = density of thinner, activator, or additive k, kilograms per liter.

W<sub>k</sub> = mass fraction of organic HAP in thinner, activator, or additive k, kilograms of organic HAP per kilogram of thinner or activator.

Solids<sub>i</sub> = solids content of aluminum primer, top coat, or clear coat i, liter solids per liter of coating.

(b) Compliance is based on a 12-month rolling average. If the weighted-average organic HAP content does not exceed 1.22 kilograms of organic HAP per liter of coating solids, then you are in compliance with the emission limit specified in § 63.5743(a)(2).