In modern industrial material systems, conductive carbon black is an important category of specialty carbon black that combines functional performance with strong engineering practicality. Owing to its stable electrical conductivity, mature processing adaptability, and favorable cost-performance balance, conductive carbon black is widely used in antistatic, conductive, and electromagnetic shielding applications, and has become a key functional filler in cable, new energy, battery, plastics, rubber, and coating systems.

From lithium-ion battery conductive additives and semiconductive cable shielding compounds to antistatic packaging materials and conductive coatings, conductive carbon black continues to play a fundamental and reliable supporting role across a wide range of industrial applications.

1. Definition and Main Types of Conductive Carbon Black

Conductive carbon black is an important subcategory of specialty carbon black. Its core characteristic lies in the use of specifically designed manufacturing processes to enable carbon black particles to more easily form continuous and stable conductive networks within composite systems, thereby significantly improving the electrical properties of materials.

Compared with conventional coloring carbon black, conductive carbon black requires stricter control over structure, purity, and consistency of electrical performance. Some high-structure, high-purity grades of highly conductive carbon black can achieve comparable or even superior conductivity at approximately 1/2 to 1/5 of the loading level of conventional conductive carbon black, thus reducing adverse effects on mechanical properties and processability.

From the perspective of production technology, conductive carbon black can generally be classified into the following three types:

1. By-product Carbon Black

By-product carbon black is not produced as a primary product but is generated as a by-product in industrial processes such as heavy oil gasification or chemical synthesis. This type of carbon black typically features large specific surface area, high porosity, and high oil absorption. To a certain extent, it can substitute acetylene carbon black in electronic and functional material applications, and is also used for functional modification in rubber, plastics, and coating systems.

2. Acetylene Carbon Black

Acetylene carbon black is produced from high-purity acetylene gas through a continuous thermal decomposition process. It exhibits a highly developed crystalline structure and secondary structure, extremely low impurity levels, and excellent electrical conductivity. It is commonly classified as a highly conductive carbon black and is mainly used in high-end conductive and battery-related applications.

3. Furnace Conductive Carbon Black

Furnace conductive carbon black is currently the most widely used type of conductive carbon black. It is produced by partially combusting gaseous or liquid hydrocarbon feedstocks in a reactor to generate high temperatures, causing the remaining feedstock to thermally decompose into carbon black. This type offers strong advantages in structural tunability, batch-to-batch consistency, and application versatility, and is widely applied in cables, plastics, rubber, and various conductive composite materials.

2. Conduction Mechanism and Key Factors Affecting Electrical Performance

2.1 Conduction Mechanism: Conductive Pathways and Percolation Effect

The electrical conductivity behavior of conductive carbon black in composite materials is generally explained by the “conductive pathway theory.” When conductive carbon black is uniformly dispersed in a matrix material, some particles form continuous conductive networks through direct contact or close proximity, enabling the system to transition from an insulating state to antistatic, electrostatic dissipative, or conductive behavior.

Whether a continuous conductive pathway can be formed depends on the dispersion state of carbon black in the system and whether the percolation threshold is reached. At low loading levels, carbon black particles remain isolated and the system behaves as an insulator. Once the loading reaches the critical percolation threshold, a conductive network forms rapidly and the volume resistivity decreases significantly. Further increases in loading lead to stabilization of the conductive network, with diminishing changes in resistivity.

2.2 Key Factors Affecting Conductivity

In practical applications, the electrical performance of conductive carbon black is not determined by a single parameter, but rather by the combined effect of multiple factors. The following four aspects are particularly critical:

(1) Primary Particle Size and Specific Surface Area

Primary particle size is commonly characterized indirectly by specific surface area indicators such as BET and CTAB. Smaller primary particle size and higher surface area result in a greater number of particles per unit volume, increasing the probability of particle contact and facilitating the formation of conductive pathways.

(2) Structure Level (Aggregate Morphology)

The structure of carbon black is typically reflected by oil absorption (DBP). High-structure carbon black more readily forms chain-like or networked aggregates, which serve as a stable conductive skeleton within composite systems, thereby lowering the percolation threshold and improving conductivity efficiency.

(3) Loading Level

Loading level is a key processing factor determining the electrical performance of composite materials. Insufficient loading prevents the formation of continuous conductive pathways. When the loading reaches and slightly exceeds the percolation threshold, conductivity improves rapidly. Further increases in loading result in diminishing conductivity gains and may adversely affect processability and mechanical properties.

(4) Dispersion State

Good dispersion is a prerequisite for conductive carbon black to achieve its intended performance. Even carbon black with high structure and small particle size cannot form effective conductive networks if dispersion is inadequate. Appropriate dispersion processes, compatible resin systems, and suitable processing conditions are essential for achieving stable electrical performance.

In practical applications, these factors should be considered holistically, and conductivity should be optimized through coordinated carbon black selection and formulation design to achieve a balance between electrical performance and overall material properties.

3. Conductivity Classification and Corresponding Applications

In practical applications, materials containing conductive carbon black are commonly classified into different conductivity levels based on volume resistivity. Each level corresponds to different functional objectives, application scenarios, and carbon black selection strategies.

3.1 Insulating Grade

Volume Resistivity: ≥ 10¹⁰–10¹² Ω·cm

Materials at this level exhibit virtually no charge conduction or dissipation capability and are mainly used in conventional plastics, rubber, and coating systems without specific electrical requirements. Conductive carbon black is generally not added, or carbon black is used solely for coloration.

3.2 Antistatic Grade

Volume Resistivity: 10⁶–10⁹ Ω·cm

Antistatic materials effectively suppress static charge accumulation and reduce issues such as dust attraction, adhesion, and safety risks caused by electrostatic discharge. They are widely used in industrial packaging, antistatic plastics, and general antistatic products.

3.3 Electrostatic Dissipative (ESD) Grade

Volume Resistivity: 10³–10⁶ Ω·cm

ESD materials can continuously and controllably dissipate electrical charges, avoiding instantaneous discharge and providing effective protection for electronic components and precision equipment. Typical applications include electronics manufacturing, antistatic flooring, and functional coatings.

3.4 Conductive Grade

Volume Resistivity: ≤ 10²–10³ Ω·cm

Conductive-grade materials possess continuous conductive pathways and are mainly used in applications requiring current conduction or electric field homogenization, such as semiconductive cable shielding layers, conductive rubber, and functional structural materials.

4. Main Application Areas of Conductive Carbon Black

4.1 Semiconductive Cable Shielding Materials

Semiconductive cable shielding compounds represent one of the most important application areas for conductive carbon black. These materials must maintain stable resistivity under both ambient and elevated temperature conditions to ensure safe cable operation. Conductive carbon black products from Anhui Black Cat have been successfully applied in inner and outer shielding layers, providing stable and low volume resistivity while maintaining good processing performance.

4.2 Antistatic Modification of Plastics and Rubber

Conventional plastics typically exhibit volume resistivity values around 10¹² Ω·cm and behave as insulating materials. By incorporating appropriate amounts of conductive carbon black, resistivity can be reduced into the antistatic range, meeting the requirements of electronic packaging and industrial products.

4.3 Battery Conductive Additives

In lithium-ion battery systems, conductive carbon black is mainly used to enhance the electrical conductivity of cathode materials and to compensate for conductive blind spots caused by the platelet structure of anode materials. It plays an important auxiliary role in ensuring rate capability and cycling stability.

In addition, conductive carbon black is widely used in energy storage systems, conductive rubber, conductive coatings, and conductive inks, with application scenarios continuing to expand.

5. Anhui Black Cat Conductive Carbon Black Product Portfolio and Application Positioning

Leveraging long-term process expertise and application research, Anhui Black Cat has established a comprehensive conductive carbon black product portfolio covering highly conductive, antistatic, and cable shielding applications. This portfolio is designed to meet diverse requirements in terms of conductivity level, processing conditions, and end-use scenarios.

5.1 Highly Conductive Carbon Black Series

(PowCarbon® CT16 / CT17)

PowCarbon® CT16 and CT17 are high-structure, high-purity highly conductive carbon black products featuring excellent conductivity efficiency and low percolation thresholds. In practical applications, they can form stable conductive networks at relatively low loadings, effectively minimizing negative impacts on mechanical properties, rheology, and processability.

These products are mainly suitable for:

l Engineering plastics and composite materials requiring high conductivity efficiency at low loading levels

l Antistatic and conductive coating systems (e.g., industrial antistatic coatings and functional coatings)

l Electronic and functional materials with high requirements for conductivity stability and consistency

5.2 Carbon Black for Cable Shielding Compounds

(M3710 / M3810)

The M3710 and M3810 series are conductive carbon black products specifically designed for cable shielding applications. Optimized for inner and outer shielding layers, these products offer a balanced combination of electrical performance, processing flowability, and batch consistency, ensuring stable resistivity under both normal and elevated temperature conditions.

They have been widely applied in EVA and PE cable shielding compound systems and are suitable for semiconductive layers in medium- and high-voltage cables.

5.3 Antistatic and General Conductive Series

(PowCarbon® CT8 / CT2)

PowCarbon® CT8 and CT2 are primarily targeted at antistatic and medium-level conductive applications, offering a balanced combination of conductivity, dispersion performance, and cost efficiency. Through appropriate formulation design, they can effectively control the volume resistivity of plastics or rubber within the antistatic range.

Typical applications include:

l Antistatic plastic products and packaging materials

l Conductive or antistatic applications requiring a balance between cost and performance

5.4 Overall Advantages of the Product Portfolio

Overall, Anhui Black Cat’s conductive carbon black portfolio covers a wide range of resistivity levels, from highly conductive to antistatic applications. By addressing diverse requirements in conductivity level, processing conditions, and cost structure, these products provide targeted solutions that enable downstream customers to achieve stable and controllable electrical performance.