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Solvent dyes and colorants for plastics

Orange OT

Also known as C.I. Solvent Orange 2, Oranz ss, AF Orange No. 2

CAS 2646-17-5Formula C17H14N2OMolar mass 262.31 g/molEC 220-162-8
GHS signal word: Warning. Pictograms: Serious health hazard 7 suppliers listed
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Orange OT chemical structure, C17H14N2O, CAS 2646-17-5
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Red needles crystallized from glacial acetic acid
Melting point
131 °C
Solubility
INSOLUBLE IN WATER, SLIGHTLY SOLUBLE IN ETHANOL, CHLOROFORM & BENZENE
HS code
320419
Category
Solvent dyes and colorants for plastics
Illustrative photo, red pigment powder in an open fibre drum in a warehouse
Typical packagingIllustrative packaging image, not the actual product

What is Orange OT?

Plain description, key identifiers and synonyms

Oil Orange SS is a member of azobenzenes.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
1-[(2-methylphenyl)diazenyl]naphthalen-2-ol
CAS number
2646-17-5 CAS number cross-checkedOther or deprecated CAS: 28700-53-0, 93449-46-8
EC number
220-162-8
Molecular formula
C17H14N2O
UNII
E939MCU4ID
MDL number
MFCD00059523
InChIKey
BQFCCCIRTOLPEF-UHFFFAOYSA-N
InChI
InChI=1S/C17H14N2O/c1-12-6-2-5-9-15(12)18-19-17-14-8-4-3-7-13(14)10-11-16(17)20/h2-11,20H,1H3
SMILES (canonical and isomeric)
CC1=CC=CC=C1N=NC2=C(C=CC3=CC=CC=C32)O

Synonyms

  • C.I. Solvent Orange 2
  • Oranz ss
  • AF Orange No. 2
  • 2-Naphthol, 1-(O-tolylazo)-
  • Oranz rozpoustedlova 2
  • 1-(o-Tolylazo)-B-naphthol
  • 2-Naphthol, 1-(o-tolyazo)-
  • orange II, C.I.
  • Solvent Orange 2
  • Fat Orange II
  • Fat Orange RR
  • Orange SS
  • Lacquer Orange V
  • Dolkwal Orange SS
  • Oleal Orange SS
  • 1-(o-Tolylazo)-2-naphthol
  • Organol Orange 2R
  • A.F. Orange No. 2
  • Japan Orange 403
  • FD & C Orange 2
  • Toluene-2-azonaphthol-2
  • 1-o-Tolylazo-2-naphthol
  • Aizen Food Orange No. 2
  • D & C Orange No. 2
  • FD and C Orange No. 2
Show all 38 synonyms
  • Orange 3R Soluble IN Grease
  • Ext D and C Orange No. 4
  • 1-(o-Tolueneazo)-2-naphthol
  • C.I. 12100
  • 1-((2-Methylphenyl)azo)-2-naphthalenol
  • 1-o-Tolueneazo-2-naphthol
  • CI 12100
  • 2-Naphthalenol, 1-((2-methylphenyl)azo)-
  • 1-[(2-methylphenyl)diazenyl]naphthalen-2-ol
  • 1-((2-Methylphenyl)azo)-2-naphthol
  • o-Tolueno-azo-beta-naphthol
  • 2-Naphthalenol, 1-[(2-methylphenyl)azo]-
  • 1-(o-Tolylazo)-beta-naphthol

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

Appearance
Red needles crystallized from glacial acetic acidexp.
Melting point
131 °Cexp.
Solubility
INSOLUBLE IN WATER, SLIGHTLY SOLUBLE IN ETHANOL, CHLOROFORM & BENZENEexp.

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
262.31 g/molcalc.
Exact mass
262.1106 Dacalc.
LogP (octanol/water)
5.27calc.
Topological polar surface area
44.95 Ųcalc.
Hydrogen bond donors
1calc.
Hydrogen bond acceptors
3calc.
Rotatable bonds
2calc.
Heavy atoms
20calc.
Rings
3calc.
Aromatic rings
3calc.
Fraction sp3 carbons
0.06calc.
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=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

GHS signal word
Warning
GHS08: Serious health hazard
Serious health hazard

Hazard statements

  • H351Suspected of causing cancer.
Precautionary statements (5)
  • P203Obtain, read and follow all safety instructions before use.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P318If exposed or concerned, get medical advice.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.

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

Full safety data and first aid

Orange OT suppliers

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

All 7 suppliers
7 of 7 offers

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

7 suppliers in 2 countries

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Orange OT 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

Dye for varnishes, oils, fats, & waxes.

Functional uses

  • Dye

How it is made

Can be synthesized by coupling diazotized ortho-toluidine with 2-naphthol, but it is not known whether this is method used for commercial production.

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 Orange OT 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 Orange OT is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Orange OT, based on the data on this page

What is Orange OT?

Oil Orange SS is a member of azobenzenes.

What is the CAS number of Orange OT?

The CAS registry number of Orange OT is 2646-17-5. Other or deprecated CAS numbers: 28700-53-0, 93449-46-8.

What is the molecular formula and weight of Orange OT?

The molecular formula of Orange OT is C17H14N2O and its molar mass is 262.31 g/mol.

What is Orange OT used for?

Dye for varnishes, oils, fats, & waxes.

Is Orange OT hazardous?

Orange OT carries the GHS signal word "Warning". Main hazards: suspected of causing cancer. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Orange OT?

Orange OT 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 Orange OT?

CompoundList lists 7 suppliers of Orange OT in India and China. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Orange OT in India?

6 suppliers in India list Orange OT on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Orange OT?

Suppliers quote Orange OT 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 Orange OT

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Post a request Sell Orange OT
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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