Explore our foundational range of highly stable, eco-compliant direct, acid, and sulfur dyes engineered for complex substrate applications.
Acid Orange 7, chemically known as Sodium 4-[(2-hydroxy-1-naphthyl)azo]benzenesulfonate (CAS 633-96-9, C.I. 15510), represents one of the most chemically resilient monoazo dyes utilized across multi-industry applications. Originating from the coupling of diazotized sulfanilic acid with 2-naphthol, this anionic dye offers exceptional solubility in water, exhibiting a brilliant, highly vibrant orange hue when applied. The molecular configuration incorporates a polar sulfonic acid group, ensuring an robust affinity toward nitrogenous fibers such as silk, wool, and polyamide, alongside specific applications in paper dyeing and chrome-tanned leather processing.
At the synthesis level, modern chemical plants require highly precise temperature controls and neutralization protocols. A slight shift in diazotization temperature or pH balance can lead to side-chain impurities that directly impact color fastness, shade depth, and chemical stability. Tianjin Sunrise Chem Group has optimized the manufacturing kinetics to ensure that each batch achieves maximum crystalline purity, resulting in a molecular composition with minimal inorganic salts, low dust generation, and consistent solubility values. Our refined production line guarantees a standardization margin of ±2% compared to standard international controls, mitigating variance issues that disrupt continuous industrial dye paths.
Every industrial batch undergoes computerized spectrophotometric matching to eliminate shade drift across multiple production cycles, guaranteeing standard ΔE values < 0.5.
Enhanced crystalline refinement yields a high dissolution rate (up to 80g/L at 90°C), minimizing residue and ensuring uniform absorption in high-exhaust dye baths.
Formulated without prohibited arylamines and heavy metals, meeting EU REACH regulations, ZDHC Level 3 requirements, and strict GOTS environmental thresholds.
The global dyestuff supply chain relies heavily on Chinese production nodes, and for good reason. Chinese manufacturing plants benefit from unmatched integration within the coal-to-chemical and petroleum-to-chemical supply chains. Crucial raw materials like sulfanilic acid, 2-naphthol, and essential aromatic intermediates are synthesized locally in massive volume, minimizing raw material supply vulnerabilities and tariff fluctuations.
Tianjin Sunrise Chem Group coordinates its logistics and sourcing within this integrated environment. Our factories leverage advanced automation, which drives down energy usage per metric ton and reduces production waste. Furthermore, by being situated close to the major maritime terminal of Tianjin Port, we streamline international transport routes. This localized logistics chain reduces container shipping delays, offering stable container loading, robust packing compliance, and highly competitive FOB/CIF shipping options for buyers in Europe, the Americas, and Southeast Asia.
The global dyestuff market is transitioning from simple cost-efficiency to environmental responsibility. Brands, consumers, and regulatory agencies globally demand strict chemical transparency. The textile and leather industries face heavy scrutiny regarding wastewater discharges and carbon footprints.
As a leading Acid Orange 7 manufacturer, we recognize that sustainability is the cornerstone of future chemical developments. The Zero Discharge of Hazardous Chemicals (ZDHC) Level 3 road map and the Global Organic Textile Standard (GOTS) guide our production changes. By purifying chemical inputs and using clean water recycling during synthesis, we have greatly reduced salt, heavy metal, and aniline residues. This makes it easier for our clients' wastewater systems to process dye effluent, helping them meet local discharge standards without high treatment costs.
Acid Orange 7's unique properties make it highly versatile across multiple key industries, each requiring specific application techniques and formulations:
In wool and silk dyeing, Acid Orange 7 operates through electrostatic attraction between the negatively charged sulfonic groups of the dye molecule and the protonated amino groups of the protein fibers in acidic environments. To achieve perfect leveling and prevent fast strike rates, our technical team recommends maintaining a pH buffer of 4.5 to 5.5 (utilizing sodium acetate and acetic acid) and introducing a non-ionic leveling agent. The temperature should be raised slowly to boiling point at a rate of 1°C per minute to ensure optimal dye penetration and fiber exhaustion.
Leather applications demand deep cross-sectional penetration into chrome-tanned crusts without surface bronzing. Acid Orange 7, owing to its molecular size, exhibits excellent diffusivity through the collagen matrix. Drum dyeing is typically executed at 50°C to 60°C at a pH of 6.0, followed by slow acidification to pH 3.5 to fix the dye on the leather fibers. For high-end upholstery and fashion leathers, our dye formulations prevent migration, ensuring long-term color integrity when exposed to light, heat, and moisture.
Agricultural manufacturers utilize Acid Orange 7 to color treat chemical fertilizers and agricultural seeds. This is crucial for tracking application patterns and identifying specialized crop treatments. Our agricultural dye selection dissolves quickly, provides high color intensity, and leaves zero hazardous residues in the soil. By offering high dye concentration at low inclusion rates, we help agricultural chemical suppliers lower their operational costs.
Long-term commercial success in the dye industry depends on reliable delivery and stable pricing. Over the past twenty years, Tianjin Sunrise Chem Group has built trusted partnerships with paper mills, textile manufacturers, and leather processing plants globally. These close working relationships allow us to align our production schedules with client requirements, minimizing inventory risks and price fluctuations.
Our commitment goes beyond simply manufacturing dyes. We focus on providing complete logistics and technical support. From our secure warehousing setup to efficient container loading at the port, we monitor every step of the journey. This thorough control guarantees that shipments arrive on time, properly sealed, and in excellent condition, ready for immediate use on our clients' production lines.
Our specialized warehousing, liquid blending systems, and container transport processes ensure safe handling and prompt global dispatch.
Procuring raw chemical materials globally requires navigating pricing shifts, strict environmental rules, and changing shipping schedules. For purchase managers, securing supply is just as critical as getting a low price. Working with a single, uncertified supplier can lead to production delays or product rejections if batch quality fails to meet international regulatory standards.
Tianjin Sunrise Chem Group addresses these supply chain challenges through our integrated production planning, bulk raw material storage, and thorough pre-shipment testing. Every batch of Acid Orange 7 is tested for concentration, solubility, and restricted chemicals before leaving our facilities. We provide buyers with detailed Certificates of Analysis (COA) and complete technical data sheets, giving you full assurance that your shipment meets all required specifications before it arrives at the port.
A broad selection of technical-grade acid, direct, and solvent dyes designed for leather processing, paper sizing, and high-performance textile coloration.
Tianjin Sunrise Chem Group specializes in manufacturing high-quality dyestuffs. Our comprehensive product portfolio includes Direct dyes, Acid dyes, Basic dyes, Sulphur dyes, Solvent dyes, Liquid dyes, and Fluorescent dyes.
Backed by decades of industry and export experience, we have built a reputation for reliability and excellence, serving clients from diverse sectors including denim, textile, leather, paper, and plastic. We always highly focus on the goods' quality and stability. Each shipment has been tested before sending to the port. Our ZDHC Level 3 and GOTS certifications guarantee the highest standards of safety and quality for your products.
We pride ourselves on offering customized solutions. Our team of experts works closely with clients to understand their unique needs and delivers tailored products and services. We actively seek strategic partnerships to expand our reach and enhance our offerings. Collaborate with us to explore mutual growth opportunities.
Environmental protection is the cornerstone of our innovation. We dedicate ourselves to providing clients with eco-friendly, high-quality colorants that balance productivity with environmental harmony, driving the industry towards a more sustainable development path while delivering high-performance products—for a greener textile industry and a sustainable future.
Our research and development team continues to design dyestuff formulations that lower biological oxygen demand (BOD) and chemical oxygen demand (COD) in effluents. By utilizing advanced membrane filtration systems, we reduce salt concentrations, ensuring that the wastewater generated in your dyeing facility is simpler and less expensive to treat. This dual commitment to environmental sustainability and dye performance makes Sunrise Chem the preferred partner for modern textile and paper mills globally.
Find quick answers to common technical, logistics, and compliance questions regarding Acid Orange 7 (CI 15510) and other commercial colorants.
Explore our high-performance inorganic colorants and direct dyes formulated to withstand high temperatures and demanding chemical conditions.
Sunrise