Direct Black 19 (CAS Registry Number 6428-31-5) is a vital trisazo dye widely sought after by chemical procurement leads in the paper, textile, leather, and plastic manufacturing sectors. As a benchmark colorant, it is prized for its high water solubility, deep black build-up, and strong affinity to cellulose materials without the need for mordants.
In today's highly scrutinized international chemical market, finding reliable China Direct Black 19 Manufacturers & Suppliers involves balancing dye strength, salt profiles, dust reduction, and strict environmental regulations. This resource provides technical specifications, purchasing strategies, and regulatory roadmaps designed to help global sourcing managers secure high-performing supply chains.
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Under the microscope: Chemical attributes, shifting global regulations, and technical innovations.
Direct Black 19 is a complex trisazo structure built from structural intermediates including H-acid, aniline, and m-phenylenediamine. The synthesis requires precise temperature controls during diazotization and coupling processes. The result is a highly anionic dye structure that bonds with cellulosic fibres through hydrogen bonding and intermolecular dispersion forces, yielding a neutral jet-black shade.
Global buyers prioritize several key quality metrics: fastness profiles (light, wash, and perspiration), solubility limits (typically >30 g/L at 80°C), dusting behavior, and heavy metal impurity limits. Managing the electrolyte balance (e.g., sodium chloride and sodium sulfate content) is essential, as salt acts as a crucial leveling agent in direct dyeing protocols.
Strict restrictions on raw materials containing restricted aromatic amines have prompted major formulation upgrades. Modern production routes utilize high-grade, purified intermediates to ensure compliance with global ecolabel criteria (GOTS, OEKO-TEX, ZDHC), minimizing toxic byproducts while retaining color depth and affinity.
Tianjin Sunrise Chem Group specializes in manufacturing high-quality dyestuffs, offering a comprehensive product portfolio that 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 prioritize product stability and quality. Every shipment is thoroughly tested before it is sent to the port, ensuring peace of mind for our buyers. Achieving ZDHC Level 3 and GOTS certificates guarantees our commitment to global quality standards.
We pride ourselves on offering customized solutions. Our team of experts works closely with clients to understand their unique needs and deliver 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.
How Sunrise Chem balances high-performance color output with global environmental compliance.
Environmental protection is the core of our innovation. We are dedicated to providing clients with eco-friendly, high-quality colorants that balance productivity with environmental harmony, driving the industry towards a more sustainable development path for a greener textile industry and a sustainable future.
ZDHC Level 3
GOTS Certified
OEKO-TEX
ISO 9001
Eco-Friendly
The **ZDHC (Zero Discharge of Hazardous Chemicals)** program is a collaborative effort by leading brands, retailers, and suppliers in the textile and footwear industry to reduce the use of hazardous substances. Achieving ZDHC Level 3 certification indicates that our company has implemented robust chemical management procedures and has met stringent requirements for chemical handling, wastewater treatment, and pollution prevention.
The **Global Organic Textile Standard (GOTS)** is a certification that ensures the organic status of textiles from the harvesting of raw materials to environmentally and socially responsible manufacturing. GOTS certified products are widely recognized as sustainable, safe, and ethical. While ZDHC focuses on the elimination of hazardous chemicals, GOTS guarantees organic and ethical compliance throughout the entire textile production lifecycle.
Technical parameters for chemical processing plants, paper mills, and dyehouses.
Ideal for cotton, rayon, and viscose fibers. The direct application requires heating to 85°C–95°C. The addition of neutral electrolytes (sodium chloride or anhydrous sodium sulfate) acts as a promoter to drive dye exhaustion. Post-treatment with cationic fixing agents is recommended to achieve optimal wash fastness.
Widely utilized in cardboard, wrapping paper, and napkin manufacture. Direct Black 19 provides high affinity to unbleached and bleached kraft pulp. It yields excellent water bleed fastness when combined with sizing agents (such as rosin sizing or alum).
Excellent penetration and level-dyeing behavior on chrome-tanned and vegetable-tanned leather. It offers deep grain coverage, and its anionic nature coordinates with leather's collagen structure at lower pH environments, ensuring uniform, non-bronzing shades.
Operational transparency and efficient handling ensure a stable supply of dyes.
One of the main reasons why customers choose us is the stable supply of dyes we provide. We have developed efficient manufacturing processes to ensure a continuous supply of our products. Our factories feature state-of-the-art equipment and a knowledgeable workforce, which enables us to fulfill the most demanding orders. With us, you can begin your manufacturing journey with confidence knowing that dye availability will never be an issue.
Apart from a steady supply, the quality of our dyes is another reason why we stand out in the market. We, SUNRISE CHEM, take pride in our commitment to producing dyes that consistently meet high standards of quality. Our experienced technicians carefully monitor the manufacturing process, ensuring that each batch of dyes is carefully tested for color fastness, durability, and other essential parameters. By choosing us, you can rest assured that your products will stand out in the market due to the vibrant and long-lasting color our dyes provide.
We firmly believe in building relationships with our clients based on trust and mutual benefit. We know that our customers' success is our success, so we are committed to providing quality services to meet their needs. Our dedicated customer support team is on hand to address any questions or concerns you may have. We value your feedback and strive to continuously improve our operations to serve you better. Our purpose is not just to supply dyes, but to be your trusted partner in achieving your business goals. By choosing us, you choose a partnership built on reliability, transparency, and mutual success.
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Common questions answered by our chemical engineers and supply chain specialists.
Direct Black 19 is a trisazo class synthetic organic dye with the CAS Registry Number 6428-31-5. Its molecular structure consists of multiple azo (-N=N-) linkages that coordinate with benzene and naphthalene derivative rings, creating a highly stable water-soluble chemical dye suitable for cellulose-based applications.
Direct Black 19 powder contains salt (typically sodium chloride or sodium sulfate), which acts as a standardizing agent to maintain batch-to-batch color strength. For specialized applications like paper mills, salt-free or liquid Direct Black 19 is preferred to prevent equipment corrosion and maintain optimal solubility.
Yes. Sunrise Chem Group provides tailored solutions, adjusting physical parameters like dusting index, solubility, and strength (e.g., 100%, 150%, or 200% standard strength) to align with client manufacturing requirements.
ZDHC Level 3 is the highest chemical safety certification. It verifies that our chemical formulations are free from banned substances and restricted aromatic amines, helping global buyers meet strict environmental regulations and ensure import compliance.
Direct Black 19 should be stored in cool, dry, well-ventilated warehouses, away from strong oxidizing agents. We supply the product in moisture-proof 25kg multi-layer paper bags, plastic drums, or iron drums to prevent clumping during transport.
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