Furnace Black[3]
Overview
Furnace black is a high-purity carbon black produced by partial combustion of heavy petroleum feedstocks in controlled furnace reactors. It accounts for over 90% of global carbon black production due to its cost efficiency and tunable properties. The furnace process allows precise control over particle size (10-500 nm) and structure, making it versatile for rubber compounding (70% of usage) and specialty applications like conductive polymers or UV-resistant coatings.
Physical and Chemical Properties
Furnace black exhibits a porous aggregate structure with surface areas ranging from 20-150 m²/g (measured by nitrogen adsorption). Its high carbon content (>97%) and low volatile matter (<1.5%) ensure stability in high-temperature applications. Key metrics include iodine adsorption number (35-160 g/kg) for surface activity and dibutyl phthalate (DBP) absorption (60-180 cm³/100g) for structure characterization. The material shows pH neutrality (6-8) and bulk density of 300-500 kg/m³.
Main Applications
In tire manufacturing, furnace black improves tread wear resistance (N100-N300 series) and reduces rolling resistance. Specialty grades like N330 (GPF) balance abrasion resistance and processability. Beyond rubber, it serves as a black pigment in inks (jet printing), coatings (automotive), and plastics (ESD protection). Ultra-conductive grades (e.g., Super P) enhance lithium-ion battery performance. Food-contact grades (FDA-approved) are used in packaging.
Safety and Storage
As a combustible dust (ST1/ST2 classification), furnace black requires explosion-proof equipment during handling. Maximum allowable concentration (MAC) is typically 3.5 mg/m³ for respirable particles. Storage silos should have nitrogen blanketing to prevent oxidation. Bulk shipments are preferred to minimize bagging/dust generation. Spills should be wetted with water mist to suppress airborne particles before cleanup.
B2B Procurement Guide
Industrial buyers should specify: 1) ASTM classification (e.g., N220 for tire sidewalls), 2) Tint strength (%), 3) 325-mesh residue (<0.001% for coatings). MOQs range from 25-ton truckloads to 1,000-ton vessel shipments. Leading producers include Cabot Corporation (Vulcan), Birla Carbon (Hi-Qual), and Orion Engineered Carbons. Spot prices fluctuate with oil/coal tar feedstock costs. Long-term contracts often include quarterly price adjustments.
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