Overview
Carbon black, commonly referred to as 'nano black' in Chinese, is a form of paracrystalline carbon produced through incomplete combustion of hydrocarbons. It consists of spherical particles with diameters ranging from 10 to 500 nanometers, aggregated into larger clusters. Due to its high surface-area-to-volume ratio and strong light absorption, it is a critical industrial material. Historically, carbon black was used as a pigment in inks and paints. Today, it serves as a reinforcing filler in rubber products (e.g., tires), a UV stabilizer in plastics, and a conductive agent in batteries. Its nano-scale properties make it indispensable in advanced applications like coatings and electronics.
Physical and Chemical Properties
Carbon black exhibits unique physicochemical properties, including high thermal stability (sublimation above 3500°C) and electrical conductivity. Its surface area ranges from 20 to 1,500 m²/g, depending on the production method (furnace, channel, or thermal process). The material is chemically inert but can oxidize at high temperatures. Notably, its tinting strength and jetness (blackness) are unmatched among pigments. The primary particle size and structure influence its dispersibility in matrices like rubber or plastics. Grades with smaller particles provide greater reinforcement but are harder to disperse uniformly.
Main Applications
Approximately 70% of global carbon black production is used in tire manufacturing, where it improves abrasion resistance and tensile strength. In plastics, it acts as a UV absorber, extending product lifespan outdoors. Specialty grades are employed in lithium-ion batteries as conductive additives. The pigment industry relies on carbon black for inks, coatings, and toners due to its opacity and color stability. Emerging applications include electromagnetic shielding and photovoltaic cells, leveraging its conductivity and light-absorption capabilities.
Safety and Storage
Carbon black is classified as a nuisance dust; prolonged inhalation may cause respiratory irritation. IARC lists it as Group 2B (possibly carcinogenic), necessitating controlled handling with NIOSH-approved respirators and local exhaust ventilation. Skin contact should be minimized using gloves. Store in sealed containers away from oxidizers and moisture. Electrostatic charges can form during handling, requiring grounded equipment to prevent ignition. Spills should be vacuumed—not swept—to avoid airborne dispersion.
B2B Procurement Guide
When sourcing carbon black, specify parameters like nitrogen surface area (NSA), dibutyl phthalate absorption (DBP), and ash content. Tire-grade variants typically have NSA of 80–150 m²/g, while pigment grades exceed 300 m²/g. Verify supplier compliance with ISO 9001 or comparable standards. Bulk purchases (20+ metric tons) often qualify for discounts. Consider regional logistics: China dominates production, but European and North American suppliers may offer shorter lead times. Request material safety data sheets (MSDS) and batch analysis certificates.
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