Solvent Black 27 C.I. Solvent Black 27

1. Basic Identification

Solvent Black 27 (C.I. Solvent Black 27) is a high-performance, oil-soluble metal-complex dye, primarily a chromium complex. It appears as a black powder and is widely recognized for its intense, deep black color with a subtle reddish undertone. Its chemical structure provides excellent transparency, allowing substrate textures such as wood grain to remain clearly visible after application.

2. Key Technical Properties

The popularity of Solvent Black 27 in various industries stems from its outstanding fastness properties. It exhibits excellent lightfastness, typically rated at level 7 on an 8-point scale, meaning it resists fading from UV exposure very well, making it suitable for both indoor and outdoor applications.

In terms of heat resistance, Solvent Black 27 is stable up to approximately 160-200°C. This makes it compatible with standard baking coating processes. It also demonstrates high resistance to both acids and alkalis, ensuring color stability in chemically aggressive environments.

Regarding solubility, Solvent Black 27 is insoluble in water. However, it dissolves readily in a wide range of organic solvents. It shows very high solubility in ketones such as methyl ethyl ketone (MEK) and in glycol ethers. It has moderate solubility in esters like ethyl acetate and lower solubility in alcohols and aromatic hydrocarbons like toluene.

3. Primary Applications

Solvent Black 27 is a versatile dye used across several industrial sectors.

In the wood finishing industry, this is its most dominant application. It is a key component in transparent wood stains, lacquers, and polishes, especially those based on nitrocellulose, polyurethane, or acrylic resins. Because of its transparency, it enhances the natural wood grain while providing a deep, rich black color. It is commonly used on high-end furniture, flooring, musical instruments like pianos and guitars, and picture frames.

In the leather industry, Solvent Black 27 is used for both drum dyeing and surface finishing. It provides uniform, deep black coverage on natural and synthetic leathers. Its good lightfastness and resistance to bleeding make it ideal for high-quality leather goods such as automotive upholstery, shoes, bags, and belts.

For printing inks, Solvent Black 27 is a standard colorant. It is used in gravure and flexographic inks for printing on packaging materials like plastic films, aluminum foil, and coated paper. It is also a primary component in permanent marker inks and whiteboard markers due to its strong solubility in alcohols and ketones.

Additionally, Solvent Black 27 finds use in metal finishing, particularly for coloring anodized aluminum and producing transparent coatings on metal surfaces. It is also used in the manufacture of specialized paints for automotive touch-ups, as well as in shoe polishes.

4. Storage and Handling Safety

Due to its powdered form and chemical nature, Solvent Black 27 requires careful handling. It is known to carry specific hazard classifications. It may cause an allergic skin reaction and has potential risks for reproductive health. Prolonged or repeated exposure can damage organs through inhalation.

Therefore, proper safety measures are essential. Operators should wear protective gloves, safety goggles, and protective clothing to prevent skin and eye contact. Respiratory protection, such as a dust mask, is necessary to avoid inhaling airborne powder. Workplaces must be well-ventilated, ideally with local exhaust ventilation. For storage, Solvent Black 27 should be kept in a tightly sealed container in a cool, dry place. Laboratory-grade material is often recommended to be stored at 2-8°C.

5. Common Trade Names

When sourcing Solvent Black 27, it may be listed under several commercial names. Common equivalents include Neozapon Black X 51, Orasol Black X 51, and Duasyn Black A-RG-VP 280. Recognizing these aliases is helpful for purchasing and formulation purposes.

In summary, Solvent Black 27 is a high-transparency, durable black dye essential for premium wood coatings, leather finishing, and printing inks, valued for its excellent light and chemical fastness.

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