Solvent Green 7: A Versatile Oil-Soluble Dye for Industrial Applications

Technical Introduction

Solvent Green 7 is a bright green-colored oil-soluble dye belonging to the anthraquinone dye family. It is widely used in plastics, petroleum products, and coatings due to its excellent solubility in organic solvents and high thermal stability.

• Chemical Name: 1,4-Bis(ethylamino)anthraquinone

• Common Name: Solvent Green 7

• C.I. Number: 10020

• Molecular Formula: C₁₈H₁₆N₂O₂

• Molecular Weight: 292.34 g/mol

• Appearance: Dark green powder or crystals

• Solubility: Soluble in hydrocarbons, oils, waxes, esters, and chlorinated solvents; insoluble in water.

Key Characteristics:

• Strong green hue with good brightness

• High coloring strength and stability

• Good lightfastness and thermal resistance

Applications

1. Plastics & Polymers

• Used for coloring PS, ABS, PVC, PMMA, and acrylic resins.

• Maintains color under processing temperatures.

2. Petroleum & Lubricants

• Coloring diesel, lubricating oils, gasoline, and hydrocarbon solvents.

• Acts as an identification dye in fuel marking systems.

3. Inks & Coatings

• Applied in printing inks, wood stains, and protective coatings.

• Provides bright green shades with good dispersion.

4. Candle & Wax Coloring

• Used for coloring candles, waxes, and polishes.

• Provides uniform and vibrant shades.

5. Other Applications

• Marker dye in laboratory and research applications.

• Used in synthetic fibers and thermoplastics.

✅ Advantages

• Excellent solubility in oils and organic solvents.

• Strong tinctorial strength for vivid green color.

• Thermal stability suitable for polymer processing.

• Lightfast and durable, resists fading in many applications.

• Versatile — applicable across plastics, fuels, coatings, and waxes.

⚙️ Technical Specifications (Typical Parameters)

⚠️ Safety & Handling

• Classification: Industrial dye — handle with standard safety precautions.

• Hazards: Dust may cause mild irritation to skin, eyes, or respiratory system.

• Precautions:

  • Use gloves, protective eyewear, and dust masks when handling.

  • Store in a dry, cool, well-ventilated place, away from moisture.

  • Prevent contamination with strong oxidizers.

❓ FAQ

Q1: Is Solvent Green 7 soluble in water?
No, it is insoluble in water but highly soluble in oils and organic solvents.

Q2: Can it be used in food or cosmetics?
No, Solvent Green 7 is not food-grade or cosmetic-grade. It is strictly for industrial applications.

Q3: What makes Solvent Green 7 suitable for fuels and lubricants?
Its oil solubility, high stability, and bright shade make it ideal for coloring fuels and oils for identification and branding.

Q4: How stable is Solvent Green 7 in plastics processing?
It withstands temperatures up to 200–300 °C, making it suitable for most thermoplastic processing.

Q5: What is the difference between Solvent Green 7 and Solvent Green 3?
Both are green dyes, but Solvent Green 7 is anthraquinone-based with higher thermal stability, while Solvent Green 3 belongs to the xanthene family and is more fluorescent.

Summary

Solvent Green 7 is a high-performance oil-soluble anthraquinone dye used across plastics, fuels, coatings, and waxes. Its strong green shade, excellent solubility, and resistance to heat and light make it indispensable in many industrial sectors. While not suitable for food or personal care, it remains one of the most reliable industrial green dyes available today.