Sunrise Solvent Red 24 Manufacturers & Factories

An In-Depth Industrial Guide to C.I. Solvent Red 24 (Sudan IV): Molecular Properties, Global Manufacturing, and Advanced Engineering Applications

1. Understanding Solvent Red 24: Chemistry and Structure

Solvent Red 24 is scientifically classified under the disazo chemical class, with a molecular formula of C₂₄H₂₀N₄O and a molecular weight of 380.44 g/mol. Its chemical structure features two azo linkages conjugated with alkyl-substituted benzene rings and a terminal beta-naphthol moiety. This conjugated aromatic system gives the molecule its high absorption coefficient in the green-blue spectrum, resulting in a vibrant, intense yellowish-red shade when dissolved.

As a non-ionic dye, Solvent Red 24 exhibits hydrophobic behavior. It is virtually insoluble in water but highly soluble in organic solvents such as aliphatic hydrocarbons, aromatic hydrocarbons (xylene, toluene), ketones (acetone, MEK), esters, and chlorinated solvents. In polymer matrix formulations, this solubility translates to molecular-level dispersion. This prevents the crystallization and migration that often affect physical pigments, making it ideal for coloring highly transparent polymers like polystyrene (PS) and polymethyl methacrylate (PMMA).

Technical Parameter	Standard Specification Value
Chemical Index Name	C.I. Solvent Red 24 (Sudan IV)
CAS Registry Number	85-83-6
Molecular Formula	C24H20N4O
Appearance / Form	Dark Red Odorless Powder
Melting Point (°C)	181 - 185 °C
Heat Resistance in PS	Up to 260 - 280 °C
Light Fastness (Xenon Arc)	6 - 7 (Blue Wool Scale)
Moisture Content (%)	≤ 1.0 %

2. Macro-Industry Solutions: Commercial & Engineering Demand

Modern manufacturing requires dyes that can withstand demanding production processes. Solvent Red 24 is engineered to meet these challenges across several key industries:

• Engineering Plastics & Masterbatches: In injection molding and extrusion, polymers like PS, ABS, SAN, and PC are processed at temperatures exceeding 250°C. Solvent Red 24 maintains its chemical integrity at these temperatures, preventing discoloration, gas formation, and structural weaknesses in the plastic parts.
• Petroleum and Fuel Markers: Governments and corporations use chemical markers to dye heating oils, diesel grades, and lubricants. This helps prevent tax evasion, fuel adulteration, and theft. Solvent Red 24 is a preferred choice due to its high solubility in fuels and resistance to extraction by common reagents.
• Industrial Coatings & Wood Stains: Used in solvent-borne wood stains, lacquer finishes, and printing inks, the dye provides high clarity and brings out the natural grain of wood substrates. Its compatibility with nitrocellulose, acrylic, and polyurethane resins ensures long-term coating stability.
• Waxes, Polishes, and Synthetic Resins: For candle making, floor polishes, shoe creams, and epoxy/polyurethane casting resins, Solvent Red 24 offers uniform color distribution without affecting the curing or physical properties of the wax or resin.

3. About SUNRISE: A Legacy of Reliability and Excellence

Tianjin Sunrise Chem Group specializes in manufacturing high-quality dyestuffs. Our product catalog 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 highly focus on product quality and batch stability. Every shipment undergoes rigorous testing before leaving our port. Our ZDHC Level 3 compliance and GOTS certifications offer guaranteed quality assurance.

Cooperating with textile and paper mills for many years shows that our factory has established strong and reliable business relationships. This long-term collaboration brings numerous benefits, including consistent orders, shared resources, and mutual support. It also demonstrates our proven track record of delivering quality products and meeting our partners' needs. Our mission is to drive business growth by providing reliable, customized products and exceptional customer service.

4. Localized Application Scenarios & Technical Specifications

To get the best performance from Solvent Red 24, it is important to match the dye to the specific requirements of the application:

• Automotive Acrylic Components: Acrylic taillights demand pure red shades with high weathering resistance. Low-purity dyes can cause haze or structural degradation. Sunrise's purified Solvent Red 24 features low salt and metal content, maintaining high transparency and performance under UV exposure.
• Industrial Wood Finishing: When coloring high-end furniture, the dye must remain stable in nitrocellulose or polyurethane systems without bleeding into topcoats. Our formulation is designed for compatibility with common paint solvents, ensuring uniform coverage without agglomeration.
• Refinery Level Fuel Dyeing: In automated fuel marking systems, dry powder dyes must dissolve quickly to prevent filter blockages. We offer customized particle-size distributions and concentrated liquid forms of Solvent Red 24 to support rapid dispersion in large-scale petroleum blending.

5. Environmental Safety, Compliance, and ZDHC/GOTS Frameworks

Environmental responsibility is central to our innovation. We are committed to providing eco-friendly, high-quality colorants that balance productivity with environmental harmony, helping the industry transition toward a more sustainable future.

A key focus is the elimination of hazardous chemicals. The ZDHC (Zero Discharge of Hazardous Chemicals) program is a collaborative effort by leading brands, retailers, and suppliers to reduce the use of harmful substances across the textile and footwear supply chains. Achieving ZDHC Level 3 certification demonstrates that Sunrise has implemented robust chemical management procedures and met strict standards for chemical handling, wastewater treatment, and pollution prevention.

Similarly, the Global Organic Textile Standard (GOTS) certification ensures the organic status of textiles, from the harvesting of raw materials to environmentally and socially responsible manufacturing. GOTS certified products are recognized as sustainable, safe, and ethical.

6. Technical Roadmap: The Future of Solvent Dyes

Sunrise's R&D department continues to develop new colorant solutions, focusing on three main areas:

1. Bio-Derived Organic Carrier Systems: We are testing bio-based solvents, such as alkyl lactates and fatty acid methyl esters, to replace fossil-based aromatics. This reduces the VOC profile of liquid dye preparations without compromising solubility or color intensity.
2. Ultra-Low Dusting Granules: To improve workplace safety, we are developing micro-granulated versions of Solvent Red 24. These granules retain the fast dissolution rates of fine powders while minimizing airborne dust in compounding facilities.
3. Metal-Free Syntheses: We are continuously refining our diazotization and coupling processes to eliminate trace heavy metals, helping our dyes meet the strict requirements of food-contact plastics and medical packaging regulations.

Industrial Logistics and Operational Safety

Reliable supply chains depend on safe logistics. We use specialized, dust-tight packaging and double-walled containers to ensure our dyes remain dry and stable during transport. Below are glimpses of our loading operations, warehouses, and container logistics.