Acid Orange 7
- CAS No.
- 633-96-5
- Chemical Name:
- Acid Orange 7
- Synonyms
- Orange II, Pure;ORANGE I;Orange 7;Ao 7;Orange 86;Orange 142;Orange II sod;NAPHTHOL ORANGE;2-naphtholorangeii;Orange II Certifed≥ 90% (dye content)
- CBNumber:
- CB0144029
- Molecular Formula:
- C16H12N2O4S.Na
- Molecular Weight:
- 351.33
- MDL Number:
- MFCD00011657
- MOL File:
- 633-96-5.mol
- MSDS File:
- SDS
- TDS File:
- TDS
| Product description | Number | Pack Size | Price |
| Orange II sodium salt (Certified by the Biological Stain Commission), Dye content ≥85% | 195235 | 25g | $62.2 |
| Orange II sodium salt (Certified by the Biological Stain Commission), Dye content ≥85% | 195235 | 100g | $146.3 |
| Acid Orange 7 >97.0%(HPLC) | G0158 | 25g | $35 |
| Acid Orange 7 >97.0%(HPLC) | G0158 | 100g | $85 |
| Acid Orange 7 | 44523 | 25g | $35 |
| More product size | |||
| Melting point | 164°C |
|---|---|
| Density | 1.525[at 20℃] |
| vapor pressure | 0Pa at 25℃ |
| storage temp. | Amber Vial, -20°C Freezer, Under inert atmosphere |
| solubility | Very soluble in water; very slightly soluble in ethanol |
| form | Crystalline Powder |
| Colour Index | 15510 |
| pka | 8.26, 11.4(at 25℃) |
| color | Green to blue |
| Odor | Odorless |
| PH Range | Amber (7.4) to orange (8.6);Orange (10.2) to red (11.8) |
| Water Solubility | 116 g/L (30 ºC) |
| λmax | 483nm |
| ε(extinction coefficient) |
≥17000 at 480-486nm in water at 0.01g/L ≥26500 at 225-231nm in water at 0.01g/L ≥7500 at 307-313nm in water at 0.01g/L |
| Merck | 14,6858 |
| BRN | 3898201 |
| Stability | Light Sensitive |
| Biological Applications | Cosmetics; wound dressing materials |
| Major Application | Organic light emitting diodes (OLEDs), nanoparticles, inks, wood preservatives, textiles, hair dyes, cosmetics, wound dressing materials, biofuel cells |
| Cosmetics Ingredients Functions |
COLORANT HAIR DYEING |
| InChI | 1S/C16H12N2O4S.Na/c19-15-10-5-11-3-1-2-4-14(11)16(15)18-17-12-6-8-13(9-7-12)23(20,21)22;/h1-10,19H,(H,20,21,22);/q;+1/p-1/b18-17+; |
| InChIKey | CQPFMGBJSMSXLP-ZAGWXBKKSA-M |
| SMILES | [Na+].Oc1ccc2ccccc2c1\N=N\c3ccc(cc3)S([O-])(=O)=O |
| LogP | -0.95 at 20℃ |
| CAS DataBase Reference | 633-96-5(CAS DataBase Reference) |
| EWG's Food Scores | 2-5 |
| FDA UNII | Q1LIY3BO0U |
| EPA Substance Registry System | C.I. Acid Orange 7, monosodium salt (633-96-5) |
| UNSPSC Code | 85151701 |
| NACRES | NA.47 |
SAFETY
Risk and Safety Statements
| Symbol(GHS) |  GHS07 |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Signal word | Warning | |||||||||
| Hazard statements | H315-H319 | |||||||||
| Precautionary statements | P264-P280-P302+P352+P332+P313+P362+P364-P305+P351+P338+P337+P313 | |||||||||
| PPE | dust mask type N95 (US), Eyeshields, Gloves | |||||||||
| Hazard Codes | Xi | |||||||||
| Risk Statements | 36/37/38 | |||||||||
| Safety Statements | 26-36-37/39 | |||||||||
| WGK Germany | 3 | |||||||||
| RTECS | DB7084000 | |||||||||
| TSCA | TSCA listed | |||||||||
| HS Code | 32041200 | |||||||||
| Storage Class | 13 - Non Combustible Solids | |||||||||
| REACH Registrations | Active | |||||||||
| NFPA 704 |
|
Acid Orange 7 price More Price(57)
| Manufacturer | Product number | Product description | CAS number | Packaging | Price | Updated | Buy |
|---|---|---|---|---|---|---|---|
| Sigma-Aldrich | 195235 | Orange II sodium salt (Certified by the Biological Stain Commission), Dye content ≥85% | 633-96-5 | 25g | $62.2 | 2026-04-30 | Buy |
| Sigma-Aldrich | 195235 | Orange II sodium salt (Certified by the Biological Stain Commission), Dye content ≥85% | 633-96-5 | 100g | $146.3 | 2026-04-30 | Buy |
| TCI Chemical | G0158 | Acid Orange 7 >97.0%(HPLC) | 633-96-5 | 25g | $35 | 2026-04-30 | Buy |
| TCI Chemical | G0158 | Acid Orange 7 >97.0%(HPLC) | 633-96-5 | 100g | $85 | 2026-04-30 | Buy |
| Cayman Chemical | 44523 | Acid Orange 7 | 633-96-5 | 25g | $35 | 2026-04-30 | Buy |
Acid Orange 7 Chemical Properties,Uses,Production
Chemical Properties
Orange-red powder
Uses
Acid Orange 7 (CAS# 633-96-5) is an environmental pollutant.
Definition
ChEBI: Acid orange 7 is a member of naphthalenes. Orange allergenic extract is used in allergenic testing.
Preparation
Acid Orange 7, commonly known as acidic orange II. 4-Aminobenzenesulfonic acid diazo, and Naphthalen-2-ol coupling. It is produced by azo coupling of β-naphthol and diazonium derivative of sulfanilic acid.
Flammability and Explosibility
Non flammable
Purification Methods
Purification is as for Orange I. Its solubility in H2O is 40g/L at 25o. [Müller et al. Helv Chim Acta 35 2579 1952.] Also purify it by extracting it with a small volume of cold water, then crystallising it by dissolving in boiling water, cooling to ca 80o, adding two volumes of EtOH and cooling. When cold, the precipitate is filtered off, washed with a little EtOH and dried in air. It can be salted out from aqueous solution with sodium acetate, then repeatedly extracted with EtOH. Meggy and Sims [J Chem Soc 2940 1956], after crystallising the sodium salt twice from water, dissolved it in cold water (11mL/g) and added conc HCl to precipitate the acid dye which was separated by centrifugation, redissolved and again precipitated with acid. After washing the precipitate three times with 0.5M acid, it was dried over NaOH, recrystallised twice from absolute EtOH, washed with a little Et2O, dried over NaOH and stored over conc H2SO4 in the dark. It can then be converted to the pure salt with the calculated amount of NaOH or Na2CO3. [Beilstein 16 IV 408.]
Properties and Applications
red light orange. Golden yellow powder. Soluble in water is red light yellow, orange soluble in alcohol. The strong sulfuric acid for quality in red, dilute create tan precipitation; In a golden of nitric acid; In the thick of sodium hydroxide solution not dissolve. Its water solution with hydrochloric acid generation tan precipitation; Add sodium hydroxide solution brown. In dyeing copper ions trend dark red in colour and lustre of iron ion shallow and dark. Discharge the gender is good. Mainly used for silk and wool dyeing, widely used in wool dyeing, can be used for wool, silk and polyamide fiber fabric of direct printing, leather and paper color, can also be used in indicator and biological shading. Is tasted can be used as a food dye, heavy metal salt used in organic pigments.
| Standard | Light Fastness | Soaping | Persperation Fastness | Oxygen bleaching | Fastness to seawater | |||
| Fading | Stain | Fading | Stain | Fading | Stain | |||
| ISO | 4 | 1 | 2 | 2-3 | 1 | 2 | 2 | 1 |
| AATCC | 5 | 1-2 | 1-2 | 1 | 1 | 1 | 3 | 3 |
Acid Orange 7 Preparation Products And Raw materials
| Supplier | Tel | Country | ProdList | Advantage | |
|---|---|---|---|---|---|
| Hebei Chuanghai Biotechnology Co., Ltd | +8615350571055 | Sibel@chuanghaibio.com | China | 8738 | 58 |
| Hebei Fengjia New Material Co., Ltd | +86-0311-87836622 +86-18712993135 | sales01@tairunfaz.com | China | 8051 | 58 |
| Henan Tianfu Chemical Co.,Ltd. | +86-0371-55170693 +86-19937530512 | info@tianfuchem.com | China | 21587 | 55 |
| Shanghai Zheyan Biotech Co., Ltd. | 18017610038 | zheyansh@163.com | CHINA | 3619 | 58 |
| career henan chemical co | +86-0371-86658258 +8613203830695 | sales@coreychem.com | China | 29815 | 58 |
| SHANDONG ZHI SHANG CHEMICAL CO.LTD | +8613065062079 | sales@sdzschem.com | China | 1497 | 58 |
| Xiamen AmoyChem Co., Ltd | +86-86-5926051114 +8615060885618 | sales@amoychem.com | China | 6366 | 58 |
| Shanghai Standard Technology Co., Ltd. | 18502101150 | ft-sales@nature-standard.com | CHINA | 1923 | 58 |
| Winchem industrial co limited | +8613003762012 | info@win-chemical.com | China | 300 | 58 |
| Shenyang Simchoice Chemical Co.,Ltd | +86-024-23769576 +86-15040101888 | sales@simchoicechem.com | China | 254 | 58 |
View Lastest Price from Acid Orange 7 manufacturers
| Image | Update time | Product | Price | Min. Order | Purity | Supply Ability | Manufacturer | |
|---|---|---|---|---|---|---|---|---|
 |
2026-05-11 | Acid orange 7
633-96-5
|
$39.00 | 99.69% | 10g | TargetMol Chemicals Inc. | ||
 |
2026-03-20 | Acid Orange 7
633-96-5
|
$1.00 | 1KG | 99% | 10 mt | Hebei Chuanghai Biotechnology Co., Ltd | |
 |
2025-12-03 | Acid Orange 7
633-96-5
|
25kg | 1 | 20MT | Winchem industrial co limited |
-
- Acid orange 7
633-96-5
- $39.00
- 99.69%
- TargetMol Chemicals Inc.
-
- Acid Orange 7
633-96-5
- $1.00
- 99%
- Hebei Chuanghai Biotechnology Co., Ltd
-
- Acid Orange 7
633-96-5
- $0.00
- 1
- Winchem industrial co limited
