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Solvent dyes and colorants for plastics

Solvent Red 5

Also known as Nitra Red WO, 2-Naphthalenamine, 1-[(4-nitrophenyl)azo]-, 2-Naphthylamine, 1-((p-nitrophenyl)azo)-

CAS 3025-77-2Formula C16H12N4O2Molar mass 292.30 g/molEC 221-181-4
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Solvent Red 5 chemical structure, C16H12N4O2, CAS 3025-77-2
2D chemical structure

Key facts

What buyers check first

All properties
Physical form
Solid
Melting point
185.5 °C
Solubility
Less than 0.1 mg/mL at 64 °F (NTP, 1992)
HS code
320419
Category
Solvent dyes and colorants for plastics
Illustrative photo, assorted laboratory chemical bottles and jars on a laboratory bench
Typical packagingIllustrative packaging image, not the actual product

What is Solvent Red 5?

Plain description, key identifiers and synonyms

Dull reddish blue to reddish violet solid or dark maroon powder. (NTP, 1992)

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
1-[(4-nitrophenyl)diazenyl]naphthalen-2-amine
CAS number
3025-77-2 CAS number cross-checked
EC number
221-181-4
Molecular formula
C16H12N4O2
UNII
75WAC80W75
InChIKey
VERRKUAVICFWGH-UHFFFAOYSA-N
InChI
InChI=1S/C16H12N4O2/c17-15-10-5-11-3-1-2-4-14(11)16(15)19-18-12-6-8-13(9-7-12)20(21)22/h1-10H,17H2
SMILES (canonical and isomeric)
C1=CC=C2C(=C1)C=CC(=C2N=NC3=CC=C(C=C3)[N+](=O)[O-])N

Synonyms

  • Nitra Red WO
  • 2-Naphthalenamine, 1-[(4-nitrophenyl)azo]-
  • 2-Naphthylamine, 1-((p-nitrophenyl)azo)-
  • C.I. 11385
  • 2-Naphthalenamine, 1-((4-nitrophenyl)azo)-
  • 1-((4-Nitrophenyl)azo)-2-naphthalenamine
  • Ci solvent red 5
  • 2-Naphthalenamine, 1-(2-(4-nitrophenyl)diazenyl)-
  • 1-((4-Nitrophenyl)azo)-2-naphthylamine
  • 2-Naphthalenamine, 1-[2-(4-nitrophenyl)diazenyl]-
  • 1-[(4-Nitrophenyl)azo]-2-naphthylamine
  • CI 11385
  • 2-Naphthylamine, 1-[(P-nitrophenyl)azo]-
  • 2-Naphthylamine, 1-((p-nitrophenyl)azo)-(7CI)
  • 1-[(4-nitrophenyl)azo]naphthalen-2-amine
  • C.i. solvent red 5
  • 1-[(4-nitrophenyl)diazenyl]naphthalen-2-amine
  • 1-((4-Nitrophenyl)azo)naphthalen-2-amine
  • 1-[(4-Nitrophenyl)azo]naphthen-2-amine
  • 1-((4-Nitrophenyl)diazenyl)-2-naphthalenamine
  • 1-[(E)-(4-nitrophenyl)diazenyl]naphthalen-2-amine

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

Physical form
Solidexp.
Melting point
185.5 °Cexp.
Solubility
Less than 0.1 mg/mL at 64 °F (NTP, 1992)exp.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
292.30 g/molcalc.
Exact mass
292.096 Dacalc.
LogP (octanol/water)
4.75calc.
Topological polar surface area
93.88 Ųcalc.
Hydrogen bond donors
1calc.
Hydrogen bond acceptors
5calc.
Rotatable bonds
3calc.
Heavy atoms
22calc.
Rings
3calc.
Aromatic rings
3calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.
Lipinski rule of five
Passes (0 violations)calc.

Calculated for screening. Confirm critical figures with the supplier.

Murcko scaffold

The ring system that remains when every side chain is removed

Murcko scaffold of this chemical, c1ccc(N=Nc2cccc3ccccc23)cc1

c1ccc(N=Nc2cccc3ccccc23)cc1

3 rings, 18 atoms, the Diazene, naphthalenylphenyl- ring system.

1,098 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

No GHS hazard classification is recorded for this substance yet. That does not mean it is harmless.

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Solvent Red 5 suppliers

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Solvent Red 5 price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

Applications are not documented for this substance yet. Suppliers often describe uses on their product pages, linked in the suppliers list above.

Regulatory status

Inventories, regulations and trade controls that list this substance

United States

  • TSCA inventory (USA)
    Status: Inactive in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Solvent Red 5 is traded under.

HS 3204.19Indicative HS code

Synthetic organic colouring matter and preparations based thereon as specified in note 3…

World exports in 2024
$1.08B
+0.2% vs 2023, imports $1.14B
2019 to 2024
Top exporters
  1. United States23.7%
  2. India * partner reported12.4%
  3. China9.0%
Top importers
  1. Germany7.5%
  2. France * partner reported6.4%
  3. Mexico5.4%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

The HS code shown for Solvent Red 5 is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Solvent Red 5, based on the data on this page

What is Solvent Red 5?

Dull reddish blue to reddish violet solid or dark maroon powder. (NTP, 1992)

What is the CAS number of Solvent Red 5?

The CAS registry number of Solvent Red 5 is 3025-77-2.

What is the molecular formula and weight of Solvent Red 5?

The molecular formula of Solvent Red 5 is C16H12N4O2 and its molar mass is 292.30 g/mol.

Is Solvent Red 5 hazardous?

No GHS hazard classification for Solvent Red 5 is recorded on CompoundList yet. That does not prove it is safe. Always read the supplier safety data sheet.

What is the HS code of Solvent Red 5?

Solvent Red 5 is usually classified under HS code 320419 (Synthetic organic colouring matter and preparations based thereon as specified in note 3…). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Solvent Red 5?

Post a free request on CompoundList and suppliers of Solvent Red 5 will send you quotes. Your contact details stay private until you accept a quote.

What is the price of Solvent Red 5?

Suppliers quote Solvent Red 5 on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Solvent Red 5

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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