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Code of Federal Regulations
Title 40 - PROTECTION OF ENVIRONMENTChapter I - ENVIRONMENTAL PROTECTION AGENCYSubchapter R - TOXIC SUBSTANCES CONTROL ACTPart 721 - SIGNIFICANT NEW USES OF CHEMICAL SUBSTANCES
Subpart E - SIGNIFICANT NEW USES FOR SPECIFIC CHEMICAL SUBSTANCES
Section 721.1660 - Benzidine-based chemical substances

40 C.F.R. § 721.1660

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Current through September 30, 2024
Section 721.1660 - Benzidine-based chemical substances
(a)Chemical substances and significant new uses subject to reporting.
(1) The benzidine-based chemical substances listed in Table 1 and Table 2 of this section are subject to reporting under this section for the significant new uses described in paragraph (a)(2) of this section.

Table 1-Benzidine-Based Chemical Substances

CAS or accession No.C.I. nameC.I. No. Chemical name
117-33-9Not availableNot available1,3-Naphthalenedisulfonic acid, 7-hydroxy-8-[2-[4'-[2-(4-hydroxyphenyl)diazenyl][1,1'-biphenyl]-4-yl]diazenyl]-
65150-87-0Not availableNot available1,3,6-Naphthalenetrisulfonic acid, 8-hydroxy-7-[2-[4'-[2-(2-hydroxy-1-naphthalenyl)diazenyl][1,1'- biphenyl]-4-yl]diazenyl]-, lithium salt (1:3)
68214-82-4Direct Navy BH225902,7-Naphthalenedisulfonic acid, 5-amino-3-[2-[4'-[2-(7-amino-1-hydroxy-3-sulfo-2- naphthalenyl)diazenyl][1,1'-biphenyl]-4- yl]diazenyl]-4-hydroxy-, sodium salt (1:2)
72379-45-4Not availableNot available2,7-Naphthalenedisulfonic acid, 4-amino-5-
hydroxy-3-[2-[4'-[2-[2-hydroxy-4-[(2- methylphenyl)amino]phenyl]diazenyl][1,1'- biphenyl]-4-yl]diazenyl]-6-(2-phenyldiazenyl)-
Accession No. 21808
CAS No. CBI (NA)		CBICBI2,7-Naphthalenedisulfonic acid, 4-amino-5-
hydroxy [[[(substituted phenylamino)] substituted phenylazo] diphenyl]azo-, phenylazo-, disodium salt. (generic name)
Accession No. 24921
CAS No.		CBICBI4-(Substituted naphthalenyl )azo diphenylyl azo-substituted carbopolycycle azo benzenesulfonic acid, sodium salt. (generic name)
Accession No. 26256
CAS No. CBI (NA)		CBICBI4-(Substituted phenyl)azo biphenylyl azo-
substituted carbopolycycloazo benzenesulfonic acid, sodium salt. (generic name)
Accession No. 26267
CAS No. CBI (NA)		CBICBI4-(Substituted phenyl)azo biphenylyl azo -
substituted carbopolycycle azo benzenesulfonic acid, sodium salt. (generic name)
Accession No. 26701
CAS No. CBI (NA)		CBICBI Phenylazoaminohydroxynaphthalenylazobiphenylazo substituted benzene sodium sulfonate. (generic name).

Table 2-Benzidine-Based Chemical Substances

CAS No.C.I. nameC.I. No. Chemical name
92-87-5BenzidineNot available[1,1'-Biphenyl]-4,4'-diamine.
531-85-1Benzidine · 2HClNot available[1,1'-Biphenyl]-4,4'-diamine, dihydrochloride.
573-58-0C.I. Direct Red 28221201- Naphthalenesulfonic acid, 3,3'-[[1,1'-biphenyl]-4,4'-diylbis(azo)]bis[4-amino-, disodium salt.
1937-37-7C.I. Direct Black 38302352,7-Naphthalenedisulfonic acid, 4-amino-3-[[4'-[(2,4-diaminophenyl) azo][1,1'-biphenyl]-4- yl]azo]-5-hydroxy-6-(phenylazo)-, disodium salt.
2302-97-8C.I. Direct Red 44225001-Naphthalenesulfonic acid, 8,8'-[[1,1'-biphenyl]-4,4'-diylbis(azo)]bis[7-hydroxy-, disodium salt.
2429-73-4C.I. Direct Blue 2225902,7-Naphthalenedisulfonic acid, 5-amino-3-[[4'-[(7-amino-1-hydroxy-3-sulfo-2-naphthalenyl)azo][1,1'-biphenyl]-4-yl]azo]-4-hydroxy-, trisodium salt.
2429-79-0C.I. Direct Orange 822130Benzoic acid, 5-[[4'-[(1-amino-4-sulfo-2-naphthalenyl) azo][1,1'-biphenyl]-4-yl]azo]-2- hydroxy-, disodium salt.
2429-81-4C.I. Direct Brown 3135660Benzoic acid, 5-[[4'-[[2,6-diamino-3-[[8-hydroxy-3,6-disulfo-7-[(4-sulfo-1-naphthalenyl)azo]-2- naphthalenyl]azo]-5-methylphenyl]azo][1,1'- biphenyl]-4-yl]azo]-2-hydroxy-, tetrasodium salt.
2429-82-5C.I. Direct Brown 222311Benzoic acid, 5-[[4'-[(7-amino-1-hydroxy-3-sulfo-2-naphthalenyl) azo][1,1'-biphenyl]-4-yl]azo]-2-hydroxy-, disodium salt.
2429-83-6Direct Black 4302452,7-Naphthalenedisulfonic acid, 4-amino-3-[[4'-[(2,4-diamino-5-methylphenyl)azo][1,1'-biphenyl]-4-yl]azo] -5-hydroxy-6-(phenylazo)-, disodium salt.
2429-84-7C.I. Direct Red 122310Benzoic acid, 5-[[4'-[(2-amino-8-hydroxy-6-sulfo-1-naphthalenyl)azo][1,1'-biphenyl]-4-yl]azo]-2-hydroxy-, disodium salt.
2586-58-5C.I. Direct Brown 1:230110Benzoic acid, 5-[[4'-[[2,6-diamino-3-methyl-5-[(4-sulfophenyl)azo]phenyl]azo][1,1'-biphenyl]-4- yl]azo]-2-hydroxy-, disodium salt.
2602-46-2C.I. Direct Blue 6226102,7-Naphthalenedisulfonic acid, 3,3'-[[1,1'-biphenyl]-4,4'-diylbis(azo)]bis[5-amino-4-hydroxy-, tetrasodium salt.
2893-80-3C.I. Direct Brown 630140Benzoic acid, 5-[[4'-[[2,4-dihydroxy-3-[(4-sulfophenyl) azo]phenyl]azo][1,1'-biphenyl]-4- yl]azo]-2-hydroxy-, disodium salt.
3530-19-6C.I. Direct Red 37222401,3-Naphthalenedisulfonic acid, 8-[[4'-[(4-ethoxyphenyl)azo][1,1'-biphenyl]-4-yl]azo]-7-hydroxy-, disodium salt
3567-65-5C.I. Acid Red 85222451,3-Naphthalenedisulfonic acid, 7-hydroxy-8-[[4'-[[4-[[(4-methylphenyl)sulfonyl]oxy]phenyl]azo][1,1'-biphenyl]-4-yl]azo]-, disodium salt.
3626-28-6C.I. Direct Green 1302802,7-Naphthalenedisulfonic acid, 4-amino-5-hydroxy-3-[[4'-[(4-hydroxyphenyl)azo][1,1'- biphenyl]-4- yl]azo]-6-(phenylazo)-, disodium salt.
3811-71-0C.I. Direct Brown 130045Benzoic acid, 5-[[4'-[[2,4-diamino-5-[(4-sulfophenyl) azo]phenyl]azo][1,1' biphenyl]-4- yl]azo]-2-hydroxy-, disodium salt.
4335-09-5C.I. Direct Green 6302952,7-Naphthalenedisulfonic acid, 4-amino-5-hydroxy-6-[[4'-[(4-hydroxyphenyl)azo][1,1'-biphenyl]-4- yl]azo]-3-[(4-nitrophenyl)azo]-, disodium salt.
6358-80-1C.I. Acid Black 94303362,7-Naphthalenedisulfonic acid, 4-amino-5-hydroxy-3-[[4'-[[4-hydroxy-2-[(2- methylphenyl)amino]phenyl]azo] [1,1'- biphenyl]-4-yl]azo]-6-[(4-sulfophenyl) azo]-, trisodium salt.
6360-29-8C.I. Direct Brown 2731725Benzoic acid, 5-[[4'-[[4-[(4-amino-7-sulfo-1-naphthalenyl)azo]-6-sulfo-1-naphthalenyl]azo][1,1'-biphenyl]-4-yl] azo]-2- hydroxy-, trisodium salt.
6360-54-9C.I. Direct Brown 15430120Benzoic acid, 5-[[4'-[[2,6-diamino-3-methyl-5-[(4-sulfophenyl)azo]phenyl] azo][1,1'-biphenyl]-4-yl]azo]-2- hydroxy-3-methyl-, disodium salt.
8014-91-3C.I. Direct Brown 7436300Benzoic acid, 3,3'-[(3,7-disulfo-1,5-naphthalenediyl)bis [azo(6-hydroxy-3,1-phenylene)azo[6(or7)-sulfo-4,1-naphthalenediyl]azo[1,1'-biphenyl]-4,4'-diylazo]]bis[6-hydroxy-, hexasodium salt.
16071-86-6C.I. Direct Brown 9530145Cuprate(2-), [5-[[4'-[[2,6-dihydroxy-3-[(2-hydroxy-5-sulfophenyl)azo]phenyl] azo][1,1'- biphenyl]-4-yl]azo]-2-hydroxybenzoato(4-)]-, disodium salt.

(2) The significant new uses are:
(i) For each of the chemical substances listed in Table 2 of this section, any use other than use as a reagent to test for hydrogen peroxide in milk; a reagent to test for hydrogen sulfate, hydrogen cyanide, and nicotine; a stain in microscopy; a reagent for detecting blood; an analytical standard; and, additionally for Colour Index (C.I.) Direct Red 28 (Congo Red) (CAS No. 573-58-0), an indicator dye.
(ii) For the chemical substances listed in Table 1 of this section: Any use.
(b)Specific requirements. The provisions of subpart A of this part apply to this section except as modified by this paragraph (b).
(1)Revocation of certain notification exemptions. The provisions of § 721.45(f) do not apply to this section. A person who imports or processes a chemical substance identified in paragraph (a)(1) of this section as part of an article for a significant new use described in paragraph (a)(2) of this section is not exempt from submitting a significant new use notice.
(2) [Reserved]

40 C.F.R. §721.1660

79 FR 77909, Dec. 29, 2014