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By Lynn L. Bergeson and Carla N. Hutton
The U.S. Environmental Protection Agency (EPA) published a final rule on June 29, 2021, that requires manufacturers (including importers) of 50 specified chemical substances to report certain lists and copies of unpublished health and safety studies to EPA. 86 Fed. Reg. 34147. EPA is issuing the final rule pursuant to Section 8(d) of the Toxic Substances Control Act (TSCA) and the TSCA Health and Safety Data Reporting rule codified at 40 C.F.R. Part 716. The chemical substances subject to the rule consist of the 20 designated by EPA as high-priority substances and the 30 organohalogen flame retardants being evaluated for risks by the Consumer Product Safety Commission (CPSC) under the Federal Hazardous Substances Act (FHSA). EPA states that it is taking this action because the TSCA Interagency Testing Committee (ITC) added these chemical substances to the TSCA Section 4(e) Priority Testing List through its 69th and 74th Reports. EPA will use the submitted information to inform the risk evaluations currently underway for 20 high-priority substances and for future prioritization.
The table below lists the high-priority substances and organohalogen flame retardants included in the final rule.

Chemical Substance Chemical Abstracts Service Registry Number
High-Priority Substances
1,3-Butadiene 106-99-0
Butyl benzyl phthalate (BBP) (1,2-Benzene-dicarboxylic acid, 1-butyl 2-(phenylmethyl) ester) 85-68-7
Dibutyl phthalate (DBP) (1,2-Benzene-dicarboxylic acid, 1,2-dibutyl ester) 84-74-2
o-Dichlorobenzene 95-50-1
p-Dichlorobenzene 106-46-7
1,1-Dichloroethane 75-34-3
1,2-Dichloroethane 107-06-2
trans-1,2-Dichloroethylene 156-60-5
1,2-Dichloropropane 78-87-5
Dicyclohexyl phthalate 84-61-7
Di-ethylhexyl phthalate (DEHP) (1,2-Benzene-dicarboxylic acid, 1,2-bis(2-ethylhexyl) ester) 117-81-7
Di-isobutyl phthalate (DIBP) (1,2-Benzene-dicarboxylic acid, 1,2-bis(2-methylpropyl) ester) 84-69-5
Ethylene dibromide 106-93-4
Formaldehyde 50-00-0
1,3,4,6,7,8-Hexahydro-4,6,6,7,8,8-hexamethylcyclopenta[g]-2-benzopyran (HHCB) 1222-05-5
4,4'-(1-Methylethylidene)bis[2,6-dibromophenol] (TBBPA) 79-94-7
Phosphoric acid, triphenyl ester (TPP) 115-86-6
Phthalic anhydride 85-44-9
1,1,2-Trichloroethane 79-00-5
Tris(2-chloroethyl) phosphate (TCEP) 115-96-8
Organohalogen Flame Retardants
Bis(2-ethylhexyl) tetrabromophthalate 26040-51-7
Bis(hexachlorocyclopentadieno)cyclooctane 13560-89-9
1,2-Bis(2,4,6-tribromophenoxy)ethane 37853-59-1
1,1'-Ethane-1,2-diylbis(pentabromobenzene) 84852-53-9
2-Ethylhexyl-2,3,4,5-tetrabromobenzoate 183658-27-7
2-(2-Hydroxyethoxy)ethyl 2-hydroxypropyl 3,4,5,6-tetrabromophthalate 20566-35-2
2,2'-[(1-Methylethylidene)bis[(2,6-dibromo-4,1-phenylene)oxymethylene]]bis[oxirane] 3072-84-2
Mixture of chlorinated linear alkanes C14-17 with 45-52 % chlorine 85535-85-9
N,N-Ethylene-bis(tetrabromophthalimide) 32588-76-4
Pentabromochlorocyclohexane 87-84-3
(Pentabromophenyl)methyl acrylate 59447-55-1
Pentabromotoluene 87-83-2
Perbromo-1,4-diphenoxybenzene 58965-66-5
Phosphonic acid, (2-chloroethyl)-, bis(2-chloroethyl) ester 6294-34-4
Phosphoric acid, 2,2-bis(chloromethyl)-1,3-propanediyl tetrakis(2-chloroethyl) ester 38051-10-4
Propanoic acid, 2-bromo-, methyl ester 5445-17-0
Tetrabromobisphenol A-bis(2,3-dibromopropyl ether) 21850-44-2
Tetrabromobisphenol A bis(2-hydroxyethyl) ether 4162-45-2
Tetrabromobisphenol A diallyl ether 25327-89-3
Tetrabromobisphenol A dimethyl ether 37853-61-5
2,4,6-Tribromoaniline 147-82-0
1,3,5-Tribromo-2-(prop-2-en-1-yloxy)benzene 3278-89-5
Tris(2-chloroethyl)phosphite 140-08-9
Tris(1-chloro-2-propyl)phosphate 13674-84-5
Tris(2-chloro-1-propyl)phosphate 6145-73-9
Tris(2,3-dibromopropyl)phosphate 126-72-7
1,3,5-Tris(2,3-dibromopropyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione 52434-90-9
Tris(1,3-dichloro-2-propyl)phosphate 13674-87-8
Tris(tribromoneopentyl)phosphate 19186-97-1
2,4,6-Tris-(2,4,6-tribromophenoxy)-1,3,5-triazine 25713-60-4

The final rule will be effective July 29, 2021. Requests to withdraw a chemical substance from the final rule pursuant to 40 C.F.R. Section 716.105(c) must be received by July 13, 2021. Information specified in the final rule is due to EPA by September 27, 2021. Detailed information about the final rule is available in our June 29, 2021, memorandum, “Manufacturers and Importers of 20 High-Priority Chemicals and 30 Organohalogen Flame Retardants Must Submit Data to EPA.”