Name: China Supplier High Purity Best Price Solvent black 7 CAS 8005-02-5
Brand: Wuhan Fortuna Chemical Co., Ltd.

Items	Specifications	Results
Appearance	Black Symmetrical Powder	Measure Up
Shade(compare with standard)	Similar~ Slight	Similar
Strength(is standard)	100±3	100
Moisture % ≤	-	≤3.8%
Fineness(150μm residue on sieve) % ≤	0.7	Pass
Conclusion	Qualified Product

Solvent Black 7

Solvent Black 7 is a synthetic azo dye specifically classified as a solvent dye. Its primary identifying code is CAS Number 8005-02-5.

As the name "solvent dye" implies, it is not soluble in water but is designed to dissolve perfectly in non-polar organic solvents, plastics, oils, and waxes. This key property defines its applications.

Chemical Structure and Properties

Class: Azo dye (characterized by the presence of the functional group R-N=N-R′).
Appearance: It is typically a dark black powder or solid with a slight bluish or greenish undertone.
Solubility: Excellent solubility in a wide range of organic solvents including:
Hydrocarbons: Toluene, xylene, mineral spirits
Halogenated solvents: Dichloromethane, trichloroethylene
Oils: Mineral oil, vegetable oils
Plastics: Molten polymers like polystyrene, ABS, and polycarbonate
Stability: It offers good thermal stability and lightfastness, which is crucial for its use in plastics and automotive applications.

Primary Applications and Uses

The exceptional solubility and stability of Solvent Black 7 make it indispensable in several industries:

1. Plastics Industry:
This is one of its largest applications. It is used to mass-color a wide variety of thermoplastics.

Examples: Polystyrene (PS), acrylics (PMMA), polycarbonate (PC), ABS, and polyesters (PET, PBT).
Why it's used: It provides a strong, jet-black coloration with good dispersion and is stable at the high temperatures required for plastic processing (injection molding, extrusion).

2. Automotive and Industrial Coatings:
It is a key component in formulating:

Oxygen Permeable Inks: Used to mark tires.
Industrial Inks: For permanent markers, ink stamps, and ballpoint pens.
Lacquers and Wood Stains: To provide deep, penetrating black shades.

3. Wax and Polishes:
Used to color shoe polishes, automotive waxes, and floor polishes, where it dissolves evenly to provide a deep black shine.

4. Fuels and Oils:
It can be used as a colorant in gasoline, heating oils, and lubricants for identification purposes.

Why is it a "Solvent" Dye?

This classification is important. Unlike acid dyes or direct dyes that are water-soluble and used for textiles like wool or cotton, solvent dyes are intrinsically oil-loving (lipophilic). Their molecules are designed to have no ionic (charged) groups, making them compatible with non-aqueous systems. Solvent Black 7 is a perfect example of this principle in action.

Safety and Handling

Regulation: As an azo dye, its safety is regulated. While many azo dyes are safe for their intended industrial uses, some can break down under specific conditions to form aromatic amines, some of which are concerning.
General Precaution: It should be handled as an industrial chemical. While not acutely toxic in its standard form, it is a fine powder that can cause dust inhalation and will stain skin and clothing.
Personal Protective Equipment (PPE): Safety glasses, gloves, and a dust mask are recommended when handling the powder to prevent irritation and staining.

Summary

In short, Solvent Black 7 is a workhorse black dye for non-aqueous systems. Its main job is to provide a deep, stable black color to a vast range of products, from the plastic casing on your electronics and car parts to the ink in your marker and the shine on your shoes. Its value lies in its excellent solubility in organic materials and its robustness during manufacturing processes.