π€ Solvent Black 7 β Technical Overview
Solvent Black 7 (C.I. Solvent Black 7, also known as Nigrosine Base) is a premium-grade, oil-soluble black dye manufactured under rigorous quality control at Tianjin Sunrise Chem Group. Recognized for its exceptional heat stability, outstanding lightfastness, and superior solubility in organic solvents and oils, it is the benchmark colorant for demanding industrial applications.
As a metal complex solvent dye, Solvent Black 7 delivers deep, rich black hues with consistent batch-to-batch performance. Its molecular architecture ensures compatibility with a wide range of polymer matrices, coating systems, and petroleum-based media β making it indispensable for plastics coloring, industrial coatings, printing inks, shoe polish, leather finishing, and more.
Every batch is subject to strict analytical testing including purity assay, melting point verification, solubility profiling, and spectrophotometric color strength measurement to guarantee product consistency and end-use reliability.
π Technical Specifications
Comprehensive analytical data for Solvent Black 7 β ensuring full traceability and application suitability across global markets.
| Parameter | Specification | Test Method |
|---|---|---|
| C.I. Name | Solvent Black 7 | ETAD / SDC |
| C.I. Number | 50415 | Colour Index |
| Chemical Class | Azine / Metal Complex (Nigrosine) | FTIR Analysis |
| Molecular Formula | CββHββNβ Β· FeClβ (typical) | MS Spectrometry |
| CAS Number | 8005-02-5 | CAS Registry |
| Appearance | Black Powder / Granule | Visual Inspection |
| Purity (Dye Content) | β₯ 97% | UV-Vis Spectrophotometry |
| Ash Content | β€ 0.5% | ISO 105-A02 |
| Moisture Content | β€ 1.0% | Karl Fischer Titration |
| Solubility (Xylene, 25Β°C) | β₯ 20 g/L | Gravimetric |
| Heat Resistance | Up to 220Β°C | TGA / DSC |
| Lightfastness | Grade 6β7 (ISO 105-B02) | Xenon Arc Test |
| Migration Resistance | Grade 4β5 | ISO 105-E03 |
| pH (1% solution) | 6.0 β 8.0 | pH Meter |
| Heavy Metals (REACH) | Compliant with EU 2023/1542 | ICP-OES |
| Packaging | 25 kg fiber drum / customized | β |
π Industrial Applications
Solvent Black 7's versatile solubility profile and superior fastness properties make it the preferred black colorant across a broad spectrum of industries worldwide.
Plastics Coloring
Excellent compatibility with ABS, PS, PE, PP, PVC, and engineering polymers. Delivers deep jet-black shades with outstanding heat stability during processing.
Lubricants & Oils
Highly soluble in mineral oils, synthetic lubricants, and transformer oils. Widely used for identification marking and aesthetic coloring of petroleum products.
Printing Inks
Ideal for solvent-based and UV-curable inks, gravure, flexographic, and screen printing systems requiring deep, stable black coloration.
Coatings & Varnishes
Compatible with alkyd, polyurethane, epoxy, and nitrocellulose coating systems. Provides uniform color distribution and excellent film integrity.
Leather & Shoe Polish
Traditional application in shoe creams, leather dressings, and polishes where deep black brilliance and rub-fastness are critical performance requirements.
Electronic Components
Used in coloring of cable insulation, connector housings, and electronic enclosures where consistent black appearance and thermal stability are essential.
Wood Stains
Excellent penetration into wood substrates when dissolved in solvent carriers, providing rich ebony finishes for furniture and decorative woodwork.
Construction Materials
Applied in coloring of bituminous products, sealants, and construction polymers requiring durable, weatherfast black pigmentation.
π§ͺ Solvent Dye Product Range
Beyond Solvent Black 7, Tianjin Sunrise Chem offers a comprehensive portfolio of high-performance solvent dyes engineered for diverse industrial requirements.
π΅ Metal Complex Solvent Dyes
Our metal complex solvent dyes (1:2 metal complex) represent the pinnacle of solvent dye technology. Featuring chromium, cobalt, or iron coordination complexes, these dyes deliver superior lightfastness (Grade 6β8), exceptional heat resistance (up to 280Β°C), and outstanding migration resistance. Ideal for high-performance plastics, automotive coatings, and premium industrial applications where demanding fastness standards must be met. Available in a full chromatic range including blacks, blues, reds, yellows, and greens.
π’ Solvent Dyes for Plastics
Specially engineered for thermoplastic and thermoset polymer coloring, our plastic-grade solvent dyes offer complete compatibility with major resin systems including ABS, PC, PMMA, PS, PET, PVC, and nylon. Key performance attributes include excellent thermal stability during injection molding and extrusion (up to 300Β°C), minimal plate-out, outstanding transparency in clear polymers, and compliance with food-contact and toy safety regulations (EN 71, FDA 21 CFR). Custom shade matching service available.
π’οΈ Oil Soluble Dyes & Oil Soluble Colours
Our range of oil soluble dyes and oil soluble colours are specifically formulated for petroleum products, lubricants, fuels, waxes, and fatty acid systems. These dyes exhibit high solubility in aliphatic and aromatic hydrocarbons, excellent color strength, and chemical stability under acidic and alkaline conditions. Applications include motor oil identification, fuel marking for tax purposes, candle coloring, cosmetic formulations, and industrial lubricant branding. Available in red, yellow, blue, green, orange, and black shades.
π‘ Fluorescent Solvent Dyes
Fluorescent solvent dyes (also known as fluorescent brighteners or Day-Glo type colorants) produce vivid, high-visibility colors with strong fluorescent emission under UV and visible light. Our fluorescent solvent dye range includes brilliant yellows, oranges, reds, and greens with exceptional brightness and good solvent compatibility. Used extensively in safety marking inks, highlighter pens, security printing, fluorescent coatings, and optical brightening of plastics and synthetic fibers. Compliant with major international safety standards.
βοΈ Solvent Based Dyes
Our solvent based dye portfolio encompasses a wide range of colorants designed for dissolution in organic solvents including alcohols, ketones, esters, aromatic hydrocarbons, and chlorinated solvents. These dyes are characterized by high tinctorial strength, excellent solubility, and superior transparency in solution. They are the preferred choice for wood staining, leather finishing, solvent-based inks, and industrial coating applications. Available in both standard and custom concentrations with precise shade control to ΞE < 0.5.
π Specialty & Custom Solvent Dyes
Tianjin Sunrise Chem's R&D team specializes in developing custom solvent dye formulations tailored to specific application requirements. Whether you need a precise Pantone color match, a dye blend with specific solubility parameters, or a formulation compliant with niche regulatory frameworks, our technical team delivers solutions with speed and precision. We also offer masterbatch-compatible solvent dye concentrates for streamlined plastic coloring operations and liquid dye preparations for ease of handling.
πͺπΊ EU REACH Standard Compliance
Full regulatory compliance is not an option β it is a core commitment. Our Solvent Black 7 and entire solvent dye range are manufactured and tested to meet the most stringent international chemical safety standards.
π EU REACH Regulation
Compliant with EU REACH (EC) No 1907/2006 and its amendments. All substances are registered, and SVHC (Substances of Very High Concern) screenings are performed against the latest ECHA candidate list. Full SDS documentation available in all EU languages.
π« Restricted Substances
Products are screened against EU REACH Annex XVII restricted substances, RoHS, and the ZDHC MRSL (Manufacturing Restricted Substances List). No carcinogenic azo dyes, no prohibited heavy metals, no CMR substances above threshold limits.
𧬠SVHC Declaration
Regular SVHC (Substances of Very High Concern) screening aligned with the latest ECHA Candidate List. Proactive communication to downstream users ensures full supply chain transparency and regulatory readiness.
π Global Regulatory Scope
Beyond EU REACH, our products comply with US EPA TSCA, China GB standards, Korea K-REACH, Japan CSCL, and other major chemical regulatory frameworks. We maintain a dedicated regulatory affairs team for ongoing compliance monitoring.
π¬ Third-Party Testing
Independent verification by accredited laboratories including SGS, Intertek, Bureau Veritas, and TΓV Rheinland. Test reports covering heavy metals, restricted azo amines, formaldehyde, pH, and color fastness are available upon request.
π ZDHC & GOTS Certified
Our manufacturing facility holds ZDHC Level 3 certification β the highest level in the Zero Discharge of Hazardous Chemicals program β alongside GOTS (Global Organic Textile Standard) certification, reflecting our commitment to responsible chemical management.
π Regulatory Assurance You Can Rely On
At Tianjin Sunrise Chem, regulatory compliance is integrated into every stage of our manufacturing process β from raw material sourcing and in-process quality control to final product testing and documentation. We provide comprehensive compliance packages including Safety Data Sheets (SDS), Technical Data Sheets (TDS), Certificate of Analysis (CoA), and REACH compliance declarations to support your regulatory requirements in any market.
β Why Choose Tianjin Sunrise Chem?
Decades of expertise, world-class manufacturing, and an unwavering commitment to quality set us apart as your trusted colorant partner.
Uncompromising Quality
Every shipment undergoes comprehensive pre-delivery inspection. Our ISO-certified laboratory performs full analytical testing including purity, color strength, fastness properties, and regulatory compliance screening before any product leaves our facility.
Advanced R&D Capability
Our dedicated research and development center employs over 50 chemists and colorists focused on next-generation colorant innovation. We continuously develop new formulations to meet evolving regulatory requirements and application demands across all major industries.
Customized Solutions
We understand that every application is unique. Our technical team works closely with customers to develop customized dye formulations, shade matches, and product specifications tailored to specific processing conditions, substrate requirements, and end-use performance criteria.
Reliable Global Supply
With strategically managed inventory and established logistics partnerships, we ensure consistent, on-time delivery to customers across 80+ countries. Our flexible order quantities β from laboratory samples to full container loads β accommodate businesses of all sizes.
Eco-Friendly Manufacturing
Environmental stewardship is embedded in our production philosophy. We employ closed-loop wastewater treatment, energy-efficient synthesis processes, and green chemistry principles to minimize our environmental footprint while delivering high-performance colorants for a sustainable future.
Dedicated Technical Support
Our application engineers and technical service team provide comprehensive support including formulation guidance, troubleshooting assistance, regulatory documentation, and ongoing technical consultation β ensuring you achieve optimal results with every product you use.
π Certifications & Standards
π’ About Tianjin Sunrise Chem Group
A world-leading manufacturer and exporter of high-performance dyestuffs and colorants with decades of proven industry expertise.
π Your Trusted Global Colorant Partner
Tianjin Sunrise Chem Group specializes in manufacturing high-quality dyestuffs, offering a comprehensive product portfolio spanning direct dyes, acid dyes, basic dyes, sulphur dyes, solvent dyes, liquid dyes, and fluorescent dyes β providing complete colorant solutions for virtually every industry. With decades of manufacturing and export expertise, we have earned an outstanding reputation for reliability, technical excellence, and customer-centric service, proudly serving clients in denim, textile, leather, paper, plastic, and numerous other sectors across more than 80 countries worldwide.
Quality & Stability Control
We prioritize strict product quality and batch-to-batch consistency. Every shipment undergoes comprehensive pre-delivery inspection, and our ZDHC Level 3 and GOTS certifications provide guaranteed product quality assurance for all clients worldwide.
Customized Solutions
Our professional technical team works closely with customers to understand unique application demands and deliver tailored products and services. We actively seek strategic partnerships and welcome collaboration for mutual growth and shared success.
Sustainable Innovation
Environmental protection underpins all our innovation efforts. We are committed to providing eco-friendly, high-performance colorants that balance production efficiency with environmental sustainability, driving the chemical and textile industries toward a greener future.
π© Request a Sample or Quote
Ready to experience the superior performance of Solvent Black 7 and our full range of solvent dyes? Contact our technical sales team today for samples, pricing, technical data sheets, and customized formulation support.
π§ Contact Us Now π§ͺ View Full Product Range