C.I. Pigment Red 4

Description

C.I. Pigment Red 4 · CAS 2814-77-9 · C16H10ClN3O3. UNII OE8ZA0KN9Z. Melting Point: 276 °C; Color Additive Status: 74.1336; Color Additive Status: 74.2336.

Identification

CAS Registry Number	2814-77-9
PubChem CID	17778
Molecular formula	C16H10ClN3O3
IUPAC name	1-[(2-chloro-4-nitrophenyl)diazenyl]naphthalen-2-ol
UNII (FDA)	OE8ZA0KN9Z

Computed Descriptors

Molecular Weight	327.72
XLogP3	5
Hydrogen Bond Donor Count	1
Hydrogen Bond Acceptor Count	5
Rotatable Bond Count	2
Exact Mass	327.0410689
Monoisotopic Mass	327.0410689
Topological Polar Surface Area	90.8
Heavy Atom Count	23
Formal Charge	0

Physical & Chemical Properties

Melting Point	276 °C
Color Additive Status	74.1336
Color Additive Status	74.2336
Color Additive Status	82.1336

Physical description & handling notes

• CBI
• Intense yellowish red
• When heated to decomposition it emits toxic fumes of Cl- and NOx.
• D&C Red No. 36
• Drugs, Cosmetics
• Ingested drugs, other than mouthwashes and dentrifices, NTE 1.7 mg daily dose for drugs taken less than 1 yr; NTE 1.0 mg/daily dose for drugs taken more than 1 yr.mouthwashes and dentrifices. Externally applied drugs. Externally applied cosmetics; cosmetic lip products (NTE 3% (by wt) of finished cosmetic product).

Regulatory Status

Regulatory & Food Contact	FDA Regulatory Status of Color Additives: Drugs, Cosmetics CIR / INCI: Hair dyeing; Cosmetic colorant
GHS notification summary	87.1% (270 / 310)

GHS Hazard Classification

GHS notification summary	87.1% (270 / 310)
Reported hazard statements	H319 (12.9%), H413 (12.3%)

Documented Uses

• Pigment in cosmetic lip products only 3% w/w max ; externally applied cosmetics only
• Used in some inks and in low cost articles such as detergents, floor polishes, colored pencils
• Pigment (printing inks, resins, paper, cosmetics)
• Cosmetics -> Hair dyeing; Cosmetic colorant
• Plastics -> Polymer Type -> N.a.
• Cosmetics product ingredient: 2-Naphthalenol, 1-[(2-chloro-4-nitrophenyl)azo]- (Red 36; Pigment red 4; CI 12085; Aka228)

Synonyms

1-((2-Chloro-4-nitrophenyl)azo)-2-naphthol; 1-[(2-Chloro-4-nitrophenyl)azo]-2-naphthol; 220-562-2; RefChem:572551; 2814-77-9; D and C Red No. 36; D&C Red No. 36; CI 12085; OE8ZA0KN9Z; Flaming Red; Permanent Red R; 2-Naphthalenol, 1-((2-chloro-4-nitrophenyl)azo)-; Carnelio Red R; MFCD00059095; 1-[(2-chloro-4-nitrophenyl)diazenyl]naphthalen-2-ol; Flame tones

Frequently Asked Questions

What are the CAS number and molecular formula of C.I. Pigment Red 4?

CAS 2814-77-9; molecular formula C16H10ClN3O3; molecular weight — g/mol.

What other names is C.I. Pigment Red 4 known by?

1-((2-Chloro-4-nitrophenyl)azo)-2-naphthol, 1-[(2-Chloro-4-nitrophenyl)azo]-2-naphthol, 220-562-2, RefChem:572551, 2814-77-9, D and C Red No. 36.

What is the regulatory status of C.I. Pigment Red 4?

Documented regulatory listings: FDA Regulatory Status of Color Additives: Drugs, Cosmetics; CIR / INCI: Hair dyeing; Cosmetic colorant.

Is C.I. Pigment Red 4 classified as hazardous?

87.1% of GHS notifications report no hazard classification (270 of 310).

What are the key physical properties of C.I. Pigment Red 4?

Melting Point: 276 °C; Color Additive Status: 74.1336; Color Additive Status: 74.2336; Color Additive Status: 82.1336.

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.