Production
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CARBOXYMETHYL CELLULOSE
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Optical Brightener FP-127
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Solvent Red 111
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COSMETIC GRADE TITANIUM DIOXIDE AMA99
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Pigment red 48-1
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Fiber Grade Titanium Dioxide AMA93
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Acid Red 249
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Solvent Red 195
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Solvent Blue 45
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FOOD GRADE TITANIUM DIOXIDE AMA98
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Fiber Titanium Dioxide Masterbatch
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Acid Orange 7
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Pigment red 170 F3RK
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Pigment orange 13
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Optical Brightener SWN
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Optical Brightener KCB
Acid Orange 33
Product Name: Acid Orange 33 / Weak Acid Orange GS
Color Index: C.I. 24780 / Acid Orange 33
CAS: 6507-77-3
Molecular Formula: C₃₄H₂₈N₄Na₂O₈S₂
Formula Weight: 730.72 g/mol
Synonyms: Weak Acid Orange GS; Weak Acid Brilliant Orange 2R; Tracid Orange GS; Coomassie Orange G; C.I. Acid Orange 33; Acidic Brilliant Orange P-2R
Application:
Textiles (Nylon, Wool, Silk), Leather Finishing, Paper Dyeing, Printing Inks, Biological Staining, Environmental Research, Analytical Chemistry
Description
marker
1.Product Description
Experience the Rich Golden Hue of Acid Orange 33 – The Premium Disazo Dye for Demanding Substrates.
Acid Orange 33 is a distinguished disazo dye, widely recognized in the industry as Weak Acid Orange GS or Brilliant Orange 2R, prized for its ability to deliver a brilliant, golden-orange shade with exceptional build-up and leveling properties . Its sophisticated molecular architecture features a central cyclohexyl bridge linking two azo-coupled aromatic systems, resulting in a larger molecular structure that provides superior wet fastness while maintaining excellent migration characteristics .
What truly distinguishes Acid Orange 33 is its dual functionality in both industrial and research applications. For textile and leather manufacturers, this dye offers outstanding penetration and coverage on challenging substrates like nylon and dense wool tops, producing a rich, vibrant orange that exhibits good lightfastness and wash fastness . The water-soluble formulation allows for consistent, level dyeing with minimal risk of aggregation.
In the scientific community, Acid Orange 33 serves as a model compound for environmental remediation studies, representing the class of persistent azo dyes that require advanced treatment technologies . Its predictable spectral behavior and well-characterized degradation pathways make it ideal for investigating adsorption mechanisms, photocatalytic degradation, and biodegradation processes .
For histological applications, our high-purity grade provides reliable performance in staining protocols, where its affinity for collagen and specific tissue components enhances microscopic visualization .
2.Product Specifications (Technical Data Sheet)
| Property | Specification | Insight |
| Product Name | Acid Orange 33 (Weak Acid Orange GS / Brilliant Orange 2R) | Premium grade for high-performance applications . |
| Appearance | Golden Orange to Dark Orange Uniform Powder | Free-flowing, micronized to minimize dust . |
| CAS No. | 6507-77-3 | Verified chemical registry number . |
| EINECS/EC No. | 229-396-5 | Listed in European inventory . |
| Solubility | Soluble in Water (golden orange solution); Slightly soluble in Ethanol (golden orange) | Excellent water solubility; forms clear, brilliant solutions . |
| Solubility in DMSO | Soluble (for research applications) | Enables formulation for biological studies . |
| Style | Anionic / Weak Acid Dye | Suitable for application in weakly acidic to neutral baths (pH 4.5-7.0). |
| Tinting Strength | High | Strong coloration with minimal dosage required . |
| Purity (Dye Content) | Technical Grade: ≥85% / High Purity: ≥98% (HPLC) | Multiple purity grades available for diverse applications . |
| Packing | 25 kg HDPE bags / 500 kg jumbo bags / 10g-1kg research packs | Secure, moisture-proof packaging options available. |
| Melting Point | >300°C (Decomposes) | High thermal stability for industrial processing . |
| Storage Conditions | Store in cool, dry place; protect from light. Research grade: Powder -20°C (3 years) / 4°C (2 years) . | Extended shelf life under proper storage conditions. |
| Application | Nylon 6, Nylon 66, Wool, Silk, Leather, Paper, Biological Staining, Research | Versatile across multiple industries |
3.Product Application (Industry Usage Guide)
Textile Industry (Nylon, Wool & Silk):
Acid Orange 33 is specifically designed for exhaust dyeing and direct printing of polyamide (nylon 6 and nylon 66) and protein fibers (wool, silk) . Apply at a pH of 4.5-6.0 using acetic acid or ammonium acetate for optimal exhaustion. Its weak acid nature allows for excellent migration and leveling, while its disazo structure ensures:
Outstanding Penetration: Ideal for tightly woven fabrics and yarn-dyed materials.
Excellent Build-up: Produces deep, rich orange shades with good yield.
Brightness Retention: Maintains brilliant golden-orange hue even under prolonged processing .
Leather Finishing:
In leather applications, Acid Orange 33 serves as a drum dye or spray dye for finished leathers and wet-blue stocks, delivering vibrant golden-orange coloration with deep penetration. It enhances the natural grain of aniline leathers without surface plating, and offers good lightfastness for finished leather goods .
Paper & Printing Inks:
The dye provides brilliant orange shades for paper pulp coloring and water-based ink formulations. Its excellent solubility ensures uniform distribution, while its anionic nature enables effective fixation on cellulose fibers .
Biological Staining:
In microscopy and histological applications, Acid Orange 33 is utilized for:
Staining techniques to visualize biological samples .
Affinity for collagen, cleaving it at specific sites for specialized tissue analysis .
Counterstaining protocols requiring orange contrast against blue or purple primary stains.
Environmental Research (Model Compound):
Acid Orange 33 is extensively used as a representative azo dye in:
Adsorption Studies: Evaluating removal efficiency on bentonite clay, organoclays, and novel adsorbents .
Advanced Oxidation Processes (AOPs): Studying degradation via Fenton reactions, photocatalysis, sonolysis, and ozonation .
Biodegradation Research: Isolating and characterizing microorganisms capable of decolorizing and mineralizing azo dyes .
Analytical Method Development: HPLC, LC-MS, and UV-Vis spectrophotometry for dye quantification and degradation product identification.
4.Features (Why Choose Our Acid Orange 33?)
Superior Molecular Architecture: The unique disazo structure with a central cyclohexyl bridge provides enhanced wet fastness and leveling properties compared to simpler monoazo dyes, making it ideal for demanding textile and leather applications .
Brilliant Golden-Orange Shade: Produces a distinctive, clean golden-orange hue (λmax characterization available) that is perfect for vibrant solids or as a key component in compound shades for fashion and technical textiles .
Multi-Industry Versatility: Equally effective in textiles, leather finishing, paper dyeing, biological staining, and environmental research – reducing inventory complexity and ensuring consistent quality across applications .
High Purity Options Available: We offer multiple grades from technical grade (≥85%) for industrial applications to high-purity (≥98% HPLC) for research, histological staining, and sensitive analytical work .
Excellent Water Solubility: Rapid dissolution in aqueous systems eliminates processing delays and ensures uniform distribution in all applications. The golden-orange solution provides visual confirmation of proper dissolution .
pH Versatility: Maintains stability and color integrity across the weakly acidic to neutral pH range (4.5-7.0), offering dyers and formulators maximum flexibility in process design.
Research-Validated Performance: Documented in peer-reviewed literature for adsorption studies, degradation pathways, and biological interactions – providing confidence for both industrial and laboratory applications .
Sustainable Profile: As a model compound for environmental remediation research, our Acid Orange 33 supports the development of sustainable wastewater treatment technologies while meeting current regulatory standards for industrial dyes.
5.Packaging
Usually is 25Kg/drum or paper box or bag with inner double PE liner Or provide customized packaging according to customer requirements.
6.Our advantage:
1) Provide free samples for testing or comparing the effect difference and cost performance.
2) Fast response speed, customers' questions at any time will be responded to in two hours.
3) Fast delivery: the fastest delivery can be made on the same day.
4)Different packaging solutions: provide various packaging options according to customer requirements.
5)Technical guidance: provide improved whitening and coloring formulas and guidance according to customer production materials.
6) Sample retention or sample mailing before bulk delivery.
7) Providing certificationes, such as Reach certification.
8) Different payment methods: TT LC, etc.
9) Providing door-to-door DDP service.
Contact Us
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