Oil Black 7

Oil Black 7 is a classic and important oil-soluble dye belonging to the azo dye class. It is insoluble in water but exhibits excellent solubility or dispersibility in a wide range of organic solvents, mineral and vegetable oils, fats, waxes, and most polymer systems, producing a deep, neutral black color.

1. Key Properties

· Excellent Solubility: Soluble in aromatic hydrocarbons (benzene, toluene, xylene), esters, ketones, and various oils and fats.

· High Tinctorial Strength: Provides a deep, intense black color with good color value.

· Good Lightfastness: Offers relatively good resistance to fading when exposed to light compared to some older oil-soluble dyes.

· Broad Compatibility: Compatible with many resins, plastics, and oil-based systems without causing adverse reactions or blooming.

2. Primary Applications

Due to its strong oil solubility and coloring power, it is widely used in:

· Ink Industry: Especially in solvent-based inks like gravure, flexographic, and screen printing inks. Also common in stamp pad inks and ballpoint pen pastes.

· Plastics Coloring: Used for coloring polystyrene (PS), ABS, polycarbonate (PC), and polymethyl methacrylate (PMMA/acrylic). Also for coloring candles.

· Coatings & Paints: Used in specialized coatings requiring transparent or deep black effects.

· Wood Staining: As a colorant in wood stains and lacquers.

· Others: Coloring of wax products, greases, and shoe polishes.

3. Comparison with Similar Dyes

· Oil Black 3: Another common black oil dye, but its hue may lean more towards a blue-black or gray-black. Tinting strength and lightfastness can differ.

· Oil Black 22: Often considered a deeper, more jet-black dye with potentially superior overall performance (light/heat fastness) and is used in more demanding applications.

· The Core Difference: Different "Oil Black" grades vary in hue (bluish, reddish, yellowish undertone), strength, and fastness properties (light, heat, migration). Selection depends on the specific application requirements.

4. Safety and Handling (Crucial Information)

· Chemical Identification: Common CAS Number is 8005-03-6 (Note: This is often for a mixture. The exact number can vary. Always refer to the supplier's Safety Data Sheet (SDS)).

· Form: Typically a black powder or granules.

· Health Hazards: As an organic dye powder, inhalation of dust may cause respiratory tract irritation. Skin contact can cause temporary staining.

· Precautions: Handle in a well-ventilated area. Use appropriate personal protective equipment (PPE) such as a dust mask, gloves, and safety glasses.

· Storage: Keep container tightly closed in a cool, dry, well-ventilated place away from heat and oxidizing agents.

5. Environmental & Regulatory Notes

As a synthetic dye, its manufacture and use are subject to local environmental and safety regulations. For products intended for export or specific uses (e.g., toys, food contact materials), compliance with regulations like REACH, RoHS, or FDA (if applicable for indirect contact) must be verified.

Summary

Oil Black 7 is a versatile and reliable black oil-soluble dye, serving as a mainstream choice for solvent-based inks, plastics, and numerous other coloring applications. When selecting this product, it is essential to obtain the Technical Data Sheet (TDS) and Safety Data Sheet (SDS) from your supplier to confirm its exact properties and ensure it is suitable for your specific formulation and end-use requirements.

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