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Sudan Orange G

Also known as: 2,4-Dihydroxyazobenzene, 4-(Phenylazo)resorcinol, C.I. Solvent Orange 1, C.I. Food Orange 3, Solvent Orange 1, Sudan G, Oil Orange G, Fat Orange A

Sudan Orange G (CAS 2051-85-6) is a compound in the Organic Compounds category listed in the Jingsj chemical database. It has the molecular formula C12H10N2O2 and a molecular weight of 214.22000 g/mol. Key properties include a melting point of 143-146ºC, a boiling point of 407.501ºC at 760 mmHg, a density of 1.24g/cm3 and a flash point of 262.509ºC. It is classified under GHS with signal word Warning and hazard statements H315 — Causes skin irritation, H319 — Causes serious eye irritation and H335 — May cause respiratory irritation. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.
2051-85-6
Jingsj CID
J-6777-6
Molecular Formula
C12H10N2O2
Molecular Weight
214.22000 g/mol
Category
Organic Compounds
Last updated
8/21/2026
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Physicochemical Properties

Melting Point143-146ºC
Boiling Point407.501ºC at 760 mmHg
Density1.24g/cm3
Flash Point262.509ºC
Exact Mass214.07400
PSA65.18000
LogP3.51320
AppearancePowder | Red-orange
Vapor Pressure0mmHg at 25°C
Refractive Index1.618

GHS Safety & Compliance

IrritantSignal word: Warning
  • H315 — Causes skin irritation
  • H319 — Causes serious eye irritation
  • H335 — May cause respiratory irritation

Frequently Asked Questions

What is the CAS number of Sudan Orange G?

The CAS number of Sudan Orange G is 2051-85-6.

What are the molecular formula and molecular weight of Sudan Orange G?

Sudan Orange G has molecular formula C12H10N2O2 and molecular weight 214.22000 g/mol.

Is Sudan Orange G hazardous?

Sudan Orange G has GHS signal word Warning and hazard statements H315 — Causes skin irritation; H319 — Causes serious eye irritation; H335 — May cause respiratory irritation.

What are the upstream and downstream products of Sudan Orange G?

For Sudan Orange G, Upstream Products: Resorcinol, Benzenediazonium chloride, Aniline hydrochloride; Downstream Products: 2-Amino-5-methoxyphenol, 4-nitroresorcinol, nitrobenzene.

Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.

Last updated:

How to cite: Jingsj. "Sudan Orange G (CAS 2051-85-6)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-6777-6 (accessed 2026-11-09).

Data for reference only; verify product details with suppliers before purchase.