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Federal Register / Vol. 86, No. 178 / Friday, September 17, 2021 / Proposed Rules
by ACA to the Agency, see the docket for this action, Docket ID No. EPAHQ
OAR20060971.
A. Table 1 to Subpart E of Part 59.
Product-Weighted Reactivity Limits by Coatings Category The national rule establishes productweighted reactivity limits, listed in Table 1, for each coating category.
Compliance with these limits is determined by the mass weighted sum of the reactivity values of the VOC
ingredients in the product. In this action, the Agency is proposing to update both the reactivity values of individual VOCs in Table 2 and the limits for each coating category in Table 1. These changes are intended to update the relative reactivity scale that underlies both the reactivity factors and limits; to further decrease the contribution of aerosol coatings to ozone formation; and to make the national rule consistent with the California regulation to improve ease of compliance and implementation.
When considering updates to coating categories and emission limits in Table 1, the EPA consulted with CARB and reviewed CARBs rationale 2 for changes made to Californias aerosol coatings regulations since promulgation of the EPA national regulation. The Agency then met with ACA to discuss their concerns. Based on the outcome of these consultations, the Agency is proposing to adopt category names and limits identical to those in the CARB aerosol coatings regulation. The proposed amendments will increase clarity and promote consistency between California and national aerosol coatings regulations, one of the stated objectives of the ACA petition.
Accordingly, the Agency is proposing to combine two sets of coatings subcategories into two main categories and to add corresponding limits for those categories, as follows:
The subcategories enamel, lacquer, and clear or metallic coatings will be subsumed under the category heading, Hobby/Model/Craft Coatings, and the category limit will be set equal to 1.6 g O3/g VOC. The subcategories clear and pigmented coatings will be subsumed under the category heading, Shellac Sealers, with the category limit set equal to 1.00
g O3/g VOC.
2 Proposed
Amendments to the Antiperspirant and Deodorants Regulation, the Consumer Products Regulation, the Aerosol Coating Products Regulation, the Tables of MIR Values, Test Method 310, and Proposed Repeal of the Hairspray Credit Program; Date of Release: August 7, 2013, Scheduled for Consideration: September 26, 2013.

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The EPA also is proposing to add six new specialty coating categories and corresponding limits for those categories, as follows:
Electrical/Electronic/Conformal Coatings, with a category limit set equal to 2.00 O3/g VOC; Flexible Coatings, with a limit equal to 1.60 O3/
g VOC; Mold Release Coatings, with a limit equal to 1.10 O3/g VOC; Rust Converter, with a limit equal to 1.10
O3/g VOC; Two Component Coating, with a limit equal to 1.20 O3/g VOC; and Uniform Finish Coating, with a limit equal to 1.30 O3/g VOC.
For a complete list of proposed changes to Table 1, see Proposed Regulation Edits for 40 CFR part 59, subpart E, located in the docket for this action, EPA Docket ID No. EPAHQ
OAR20060971.
B. Table 2 to Subpart E of Part 59.2A
Reactivity Factors, 2B Aliphatic Hydrocarbon Solvent Mixtures, and 2C
Aromatic Hydrocarbon Solvent Mixtures The EPA is proposing to amend Tables 2A, 2B, and 2C by adding new compounds and RFs and updating existing reactivity values. The proposed changes will provide uniformity between CARB 3 and national aerosol coatings regulations 73 FR 15604.
California uses maximum incremental reactivity MIR values 4 as the basis for its aerosol coatings regulations. In the national rule, the Agency uses the term reactivity factor and sets the value equal to the MIR or upper limit MIR
used by CARB.
In accordance with 40 CFR part 59, subpart E, section 59.511j, ACA
submitted petitions requesting the EPA
add 17 new compounds and RFs to Table 2A and update the RF of one existing compound mixture on Table 2B. The petitioners provided the chemical names, CAS numbers, a statement certifying the intent to use the compounds in aerosol coatings products, and information allowing the EPA to evaluate the reactivity of the compounds and assign RF values. Of the 17 new compound additions to Table 2A, CARB has assigned MIR values for 15 of the compounds in Californias aerosol coatings regulation,5 which the Agency is proposing to adopt in this action. The proposed RFs of the two remaining compounds are equal to 0.04
g O3/g VOC for trans-1-chloro-3,3,33 Title 17, Californias Regulation, Division 3, Chapter 1, Subchapter 8.5, Article 3, Aerosol Coatings Products, Sections 9452094528
Amended September 17, 2014.
4 Title 17, CCR, Article 1, Tables of Maximum Incremental Reactivity Values, Sections 94700
94701 Amended September 17, 2014.
5 Ibid.

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trifluoropropene HFO-1233zdE, CAS
102687650, based on MIR values from Carter 6; and 0.71 g O3/g VOC for diethyl carbonate, CAS 105588, based on MIR
values derived by Venecek.7
One of the compounds being added, dipropylene glycol monomethyl ether, CAS 34590948, is a mixture of isomers. The compound, 2-2methoxypropoxy-1-propanol, CAS
13588288, which is an isomer of dipropylene glycol monomethyl ether, is already on Table 2A. Both compounds are assigned the same RF.
In addition to adding the identified compounds, the Agency is proposing to update all of the existing reactivity factors listed in Table 2A, 2B, and 2C to align with the MIR values in the current California regulation.8 This change is necessary to maintain the internal consistency of the relative reactivity scale and consistency with the changes proposed for the limits in Table 1.
For a complete list of proposed changes to Table 2, see Proposed Regulation Edits for 40 CFR part 59, subpart E in the docket for this action, EPA Docket ID No. EPAHQOAR
20060971.
C. The Default Reactivity Factor The ACA petition requested the EPA
revise the default RF for compounds in aerosol coatings formulations that do not have an established RF listed in Table 2A to subpart E of part 59
Reactivity Factors. Consistent with the EPAs methodology for setting the default RF, if a VOC does not have an RF, then the EPA assigns the compound the maximum RF for any compound listed in the rule. See 72 FR 38952 July 16, 2007. Therefore, the EPA is proposing to revise the default RF to 18.50 g O3/g VOC, the highest RF in this proposed rule. Furthermore, the EPA is proposing to require that regulated entities include the name and CAS
number of all VOCs that are assigned the default RF, as specified in reporting requirements.
The EPA also is proposing that, if a VOC is used in a product and is not listed in Table 2A, but its isomer is listed in Table 2A, then the RF of the isomer will be used. If more than one 6 Carter, William 2009. Investigation of Atmospheric Ozone Impacts of Trans 1-Chloro3,3,3-Trifluoropropene, Final Report. Riverside, California: Center for Environmental Research and Technology, University of California.
7 Venecek, Melissa 2020. Estimating Maximum Incremental Reactivity for Diethyl Carbonate. Final Report. Sacramento, California: Technical Development Section, Consumer Products and Air Quality Assessment Branch, Air Quality Planning and Science Division, California Air Resources Board.
8 Title 17, CCR, Sections 9470094701.

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