Orange IV
- CAS NO.：554-73-4
- Empirical Formula: C18H16N3NaO3S
- Molecular Weight: 377.39
- MDL number: MFCD00038130
- EINECS: 209-071-4
- SAFETY DATA SHEET (SDS)
- Update Date: 2025-12-31 14:38:37
What is Orange IV?
Chemical properties
yellow-brown or orange powder
The Uses of Orange IV
As indicator. pH: red 1.4 to yellow 2.6.
Preparation
ommonly known as acidic orange IV. 4-Aminobenzenesulfonic acid diazo, with Diphenylamine coupling.
Purification Methods
Recrystallise it twice from water [Kolthoff & Gus J Am Chem Soc 60 2516 1938]. [Beilstein 16 II 171.]
Properties and Applications
yellow orange. Soluble in water and ethanol for orange, slightly soluble in ethyl ether, insoluble in benzene. The strong sulfuric acid is purple, dilute appears after the purple precipitation. In water solution to join hydrochloric acid appear purple precipitation; With sodium hydroxide appear yellow precipitation. Used for wool, silk, cotton, vinegar fiber etc fiber dyeing. Can also be used to indicator, paper, soap kind, straw and leather color. Good levelness, discharge sex medium, dyeing encounter copper, iron ion color shade darker.
| Standard | Light Fastness | Soaping | Persperation Fastness | Oxygen bleaching | Fastness to seawater | |||
| Fading | Stain | Fading | Stain | Fading | Stain | |||
| ISO | 3 | 1-2 | 2 | 1-2 | 1-2 | |||
Properties of Orange IV
| Melting point: | >300°C |
| storage temp. | Inert atmosphere,Room Temperature |
| solubility | Solubility Soluble in water, ethanol |
| form | Powder |
| Colour Index | 13080 |
| pka | 2.0(at 25℃) |
| color | S. No.: 179 |
| PH Range | 1.3(red)-3.2(yellow) |
| λmax | 527nm, 443nm |
| Merck | 14,9776 |
| Stability: | Stable. Incompatible with strong oxidizing agents. |
| Major Application | Sensors, lithographic plates, optical recording media, photoreceptor, inks, indication system for product exceeding threshold temperature, lubricants, textiles, food storage, determination of amiodarone, astemizole, bromhexine, clomipramine, deutiforin, domperidone, fluoroquinolone, roxithromycin, terfenadine, thiabendazole, antihistamines |
| CAS DataBase Reference | 554-73-4(CAS DataBase Reference) |
| EPA Substance Registry System | Benzenesulfonic acid, 4-[[4-(phenylamino)phenyl]azo]-, monosodium salt (554-73-4) |
Safety information for Orange IV
| Signal word | Warning |
| Pictogram(s) |
 Flame Flammables GHS02 |
| GHS Hazard Statements |
H228:Flammable solids |
| Precautionary Statement Codes |
P210:Keep away from heat/sparks/open flames/hot surfaces. — No smoking. P241:Use explosion-proof electrical/ventilating/lighting/…/equipment. P280:Wear protective gloves/protective clothing/eye protection/face protection. P370+P378:In case of fire: Use … for extinction. |
Computed Descriptors for Orange IV
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