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Solvent dyes and colorants for plastics

Solvent Red 4

Also known as 1-(1-Naphthylazo)-2-naphthol, 2-Naphthalenol, 1-(1-naphthalenylazo)-, Fat scarlet 2r

CAS 2653-64-7Formula C20H14N2OMolar mass 298.35 g/molEC 220-176-4
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Solvent Red 4 chemical structure, C20H14N2O, CAS 2653-64-7
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
2653-64-7
Formula
C20H14N2O
Molar mass
298.35 g/mol
EC number
220-176-4
HS code
320419
Category
Solvent dyes and colorants for plastics

What is Solvent Red 4?

Plain description, key identifiers and synonyms

Solvent Red 4 is a chemical substance with the molecular formula C20H14N2O and a molar mass of 298.35 g/mol. Its CAS registry number is 2653-64-7. The IUPAC name is 1-(naphthalen-1-yldiazenyl)naphthalen-2-ol.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
1-(naphthalen-1-yldiazenyl)naphthalen-2-ol
CAS number
2653-64-7 CAS number cross-checkedOther or deprecated CAS: 40339-37-5
EC number
220-176-4
Molecular formula
C20H14N2O
UNII
EVE9WNU99R
MDL number
MFCD00071296
InChIKey
CYZWPZHRSZNWLS-UHFFFAOYSA-N
InChI
InChI=1S/C20H14N2O/c23-19-13-12-15-7-2-4-10-17(15)20(19)22-21-18-11-5-8-14-6-1-3-9-16(14)18/h1-13,23H
SMILES (canonical and isomeric)
C1=CC=C2C(=C1)C=CC=C2N=NC3=C(C=CC4=CC=CC=C43)O

Synonyms

  • 1-(1-Naphthylazo)-2-naphthol
  • 2-Naphthalenol, 1-(1-naphthalenylazo)-
  • Fat scarlet 2r
  • Ci solvent red 4
  • 2-Naphthalenol, 1-(2-(1-naphthalenyl)diazenyl)-
  • 2-Hydroxy-1,1'-azonaphthalene
  • CI 12170
  • 2-Naphthol, 1-(1-naphthylazo)-
  • 1-(2-Hydroxynaphthyl)-1'-azonaphthalene
  • 2-Naphthalenol, 1-[2-(1-naphthalenyl)diazenyl]-
  • C.I. Solvent Red 4
  • Fat Bordeaux
  • Grasal Red
  • Fat Bordeaux R
  • Waxoline Red BN
  • Autol Red RLP
  • C.I. 12170
  • Bordeaux P51N
  • Bordeaux P51R
  • Lutetia Bordeaux B
  • Somalia Bordeaux R
  • Sudan Red 2R
  • Organol Mahogany TJ
  • Red 2R
  • 1-(Naphthalen-1-yldiazenyl)naphthalen-2-ol
Show all 34 synonyms
  • Dainichi Naphthylamine Bordeaux 5B
  • (E)-1-(Naphthalen-1-yldiazenyl)naphthalen-2-ol
  • Naphthylamine Bordeaux (diluted with Barium Sulfate)
  • hydroxyazonaphthalene
  • 1-[2-(naphthalen-1-yl)diazen-1-yl]naphthalen-2-ol
  • Naphthylamine Bordeaux
  • 1-(1-naphthylazo)naphthalen-2-ol
  • 1-[(Naphthalen-1-yl)diazenyl]naphthalen-2-ol
  • Solvent red 4 Solution in Methanol, 100ug/mL

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

No measured properties are recorded for this substance yet. Ask suppliers for a technical data sheet.

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
298.35 g/molcalc.
Exact mass
298.1106 Dacalc.
LogP (octanol/water)
6.11calc.
Topological polar surface area
44.95 Ųcalc.
Hydrogen bond donors
1calc.
Hydrogen bond acceptors
3calc.
Rotatable bonds
2calc.
Heavy atoms
23calc.
Rings
4calc.
Aromatic rings
4calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.
Lipinski rule of five
Passes (1 violation)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, c1ccc2c(N=Nc3cccc4ccccc34)cccc2c1

c1ccc2c(N=Nc3cccc4ccccc34)cccc2c1

4 rings, 22 atoms, the 1,2-Di-1-naphthalenyldiazene ring system.

184 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 4 suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

All 2 suppliers

Suppliers marked Unclaimed profile have not claimed their profile yet. They are not verified by CompoundList, their offers are price on request and details may have changed, so please confirm them with the supplier. Company representatives can claim a profile with a business email on the company's own website domain. Our team verifies each claim and sends the result by email.

Where suppliers are based

2 suppliers in 1 country

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Solvent Red 4 price

Indicative price range per kg from live supplier offers

No published prices right now

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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: Active 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 4 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 4 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 4, based on the data on this page

What is Solvent Red 4?

Solvent Red 4 is a chemical substance with the molecular formula C20H14N2O and a molar mass of 298.35 g/mol. Its CAS registry number is 2653-64-7. The IUPAC name is 1-(naphthalen-1-yldiazenyl)naphthalen-2-ol.

What is the CAS number of Solvent Red 4?

The CAS registry number of Solvent Red 4 is 2653-64-7. Other or deprecated CAS numbers: 40339-37-5.

What is the molecular formula and weight of Solvent Red 4?

The molecular formula of Solvent Red 4 is C20H14N2O and its molar mass is 298.35 g/mol.

Is Solvent Red 4 hazardous?

No GHS hazard classification for Solvent Red 4 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 4?

Solvent Red 4 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 4?

CompoundList lists 2 suppliers of Solvent Red 4 in India. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Solvent Red 4 in India?

2 suppliers in India list Solvent Red 4 on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Solvent Red 4?

Suppliers quote Solvent Red 4 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 4

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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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