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Solvent dyes and colorants for plastics

Solvent Red 25

Also known as Sudan Red B, C.I. Solvent Red 25, Ceres Red B

CAS 3176-79-2Formula C24H20N4OMolar mass 380.45 g/molEC 221-647-7
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Solvent Red 25 chemical structure, C24H20N4O, CAS 3176-79-2
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
3176-79-2
Formula
C24H20N4O
Molar mass
380.45 g/mol
EC number
221-647-7
HS code
320419
Category
Solvent dyes and colorants for plastics

What is Solvent Red 25?

Plain description, key identifiers and synonyms

Solvent Red 25 is a chemical substance with the molecular formula C24H20N4O and a molar mass of 380.45 g/mol. Its CAS registry number is 3176-79-2. The IUPAC name is 1-[[3-methyl-4-[(3-methylphenyl)diazenyl]phenyl]diazenyl]naphthalen-2-ol.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
1-[[3-methyl-4-[(3-methylphenyl)diazenyl]phenyl]diazenyl]naphthalen-2-ol
CAS number
3176-79-2 CAS number cross-checked
EC number
221-647-7
Molecular formula
C24H20N4O
UNII
6FF2354A0O
MDL number
MFCD00021456
InChIKey
NHXXLZBKTKNTEF-UHFFFAOYSA-N
InChI
InChI=1S/C24H20N4O/c1-16-6-5-8-19(14-16)25-27-22-12-11-20(15-17(22)2)26-28-24-21-9-4-3-7-18(21)10-13-23(24)29/h3-15,29H,1-2H3
SMILES (canonical and isomeric)
CC1=CC(=CC=C1)N=NC2=C(C=C(C=C2)N=NC3=C(C=CC4=CC=CC=C43)O)C

Synonyms

  • Sudan Red B
  • C.I. Solvent Red 25
  • Ceres Red B
  • 1-[[3-methyl-4-[(3-methylphenyl)azo]phenyl]azo]-2-naphthol
  • 2-Naphthalenol, 1-[[3-methyl-4-[(3-methylphenyl)azo]phenyl]azo]-
  • C.I. 26110
  • CI 26110
  • 1-((3-Methyl-4-((3-methylphenyl)azo)phenyl)azo)-2-naphthol
  • 2-Naphthalenol, 1-((3-methyl-4-((3-methylphenyl)azo)phenyl)azo)-
  • 1-(4-(m-Tolylazo)-m-tolylazo)-2-naphthol
  • 2,3'-Dimethyl-4-((2-hydroxy-1-naphthyl)azo)azobenzene
  • 1-(2-(3-Methyl-4-(2-(3-methylphenyl)diazenyl)phenyl)diazenyl)-2-naphthalenol
  • 2-Naphthalenol, 1-(2-(3-methyl-4-(2-(3-methylphenyl)diazenyl)phenyl)diazenyl)-
  • Solvent Red 25 (Technical Grade)
  • 1-((3-Methyl-4-(m-tolyldiazenyl)phenyl)diazenyl)naphthalen-2-ol
  • 1-({3-methyl-4-[(3-methylphenyl)diazenyl]phenyl}diazenyl)naphthalen-2-ol
  • 1-[[3-methyl-4-[(3-methylphenyl)diazenyl]phenyl]diazenyl]naphthalen-2-ol
  • Fat Deep Red
  • Solvent Red 25, tech
  • Sudan Red B, analytical standard
  • 1-(2-{3-methyl-4-[2-(3-methylphenyl)diazen-1-yl]phenyl}hydrazin-1-ylidene)-1,2-dihydronaphthalen-2-one

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
380.45 g/molcalc.
Exact mass
380.1637 Dacalc.
LogP (octanol/water)
7.99calc.
Topological polar surface area
69.67 Ųcalc.
Hydrogen bond donors
1calc.
Hydrogen bond acceptors
5calc.
Rotatable bonds
4calc.
Heavy atoms
29calc.
Rings
4calc.
Aromatic rings
4calc.
Fraction sp3 carbons
0.08calc.
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, c1ccc(N=Nc2ccc(N=Nc3cccc4ccccc34)cc2)cc1

c1ccc(N=Nc2ccc(N=Nc3cccc4ccccc34)cc2)cc1

4 rings, 26 atoms.

115 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 25 suppliers

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

All 10 suppliers
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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

10 suppliers in 3 countries

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Solvent Red 25 price

Indicative price range per kg from live supplier offers

No published prices right now

Suppliers quote this chemical on request. Send one free request and compare quotes side by side.

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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

No regulatory list memberships are recorded for this substance yet. Always check the rules of the importing and exporting country before trade.

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 25 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 25 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 25, based on the data on this page

What is Solvent Red 25?

Solvent Red 25 is a chemical substance with the molecular formula C24H20N4O and a molar mass of 380.45 g/mol. Its CAS registry number is 3176-79-2. The IUPAC name is 1-[[3-methyl-4-[(3-methylphenyl)diazenyl]phenyl]diazenyl]naphthalen-2-ol.

What is the CAS number of Solvent Red 25?

The CAS registry number of Solvent Red 25 is 3176-79-2.

What is the molecular formula and weight of Solvent Red 25?

The molecular formula of Solvent Red 25 is C24H20N4O and its molar mass is 380.45 g/mol.

Is Solvent Red 25 hazardous?

No GHS hazard classification for Solvent Red 25 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 25?

Solvent Red 25 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 25?

CompoundList lists 10 suppliers of Solvent Red 25 in China, India and United States. 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 25 in India?

2 suppliers in India list Solvent Red 25 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 25?

Suppliers quote Solvent Red 25 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

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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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