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Orange IV

Also known as: Tropaeolin OO, Acid Orange 5, C.I. 13080, Acid Orange IV, Tropeolin OO, Diphenylamine Orange, Sodium 4-[(4-anilinophenyl)azo]benzenesulfonate, Benzenesulfonic acid, 4-[[4-(phenylamino)phenyl]azo]-, monosodium salt

Orange IV (CAS 554-73-4) is a compound in the Organic Compounds category listed in the Jingsj chemical database. It has the molecular formula C18H14N3NaO3S and a molecular weight of 375.377 g/mol. 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.
554-73-4
Jingsj CID
J-44323-2
Molecular Formula
C18H14N3NaO3S
Molecular Weight
375.377 g/mol
Category
Organic Compounds
Last updated
8/21/2026
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Physicochemical Properties

Exact Mass375.065369
PSA102.33000
LogP5.90350

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 Orange IV?

The CAS number of Orange IV is 554-73-4.

What are the molecular formula and molecular weight of Orange IV?

Orange IV has molecular formula C18H14N3NaO3S and molecular weight 375.377 g/mol.

Is Orange IV hazardous?

Orange IV 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 Orange IV?

For Orange IV, Upstream Products: p-Diazobenzenesulfonic acid, Diphenylamine; Downstream Products: Biphenyl, p-Diazobenzenesulfonic acid, Sulfanilic acid.

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

Last updated:

How to cite: Jingsj. "Orange IV (CAS 554-73-4)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-44323-2 (accessed 2026-11-09).

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