Overview
Oil-based black paste is a pre-dispersed pigment formulation designed for easy incorporation into oil-based systems. It primarily consists of carbon black particles stabilized in a resin or solvent carrier. Unlike powder pigments, it eliminates dust hazards and ensures uniform dispersion, reducing production time for coatings and inks. This product is favored in industries requiring deep, opaque black shades with minimal settling. Its compatibility with alkyds, epoxies, and other oil-based binders makes it versatile for both decorative and protective applications.
Physical and Chemical Properties
The paste exhibits a viscous, non-Newtonian flow behavior, which facilitates mixing while preventing pigment sedimentation. Its pH is typically neutral (6-8), and it demonstrates strong UV resistance due to carbon black's inherent stability. Key performance metrics include tinting strength (measured against standards like ISO 787-24) and viscosity (commonly 2,000-10,000 cP at 25°C). The formulation may include wetting agents or anti-settling additives to enhance shelf life, which usually exceeds 12 months under proper storage.
Main Applications
In coatings, the paste is used for automotive underbody protection, machinery enamels, and anti-corrosive paints where deep black color and durability are critical. Printing inks for packaging and publications rely on its high opacity to achieve crisp imagery. Woodworking industries employ it in stains and lacquers, while artist-grade variants are used in oil paints. Its compatibility with spray, brush, and roller application methods adds to its versatility across manufacturing processes.
Safety and Storage
As a flammable material, the paste should be stored away from ignition sources. Containers must be tightly sealed to prevent solvent evaporation, which can alter viscosity. Spills should be contained with absorbent materials like sand, not water. Workplace exposure limits for carbon black (typically 3.5 mg/m³ as TWA) apply. Adequate ventilation is mandatory during handling, and skin contact should be minimized to avoid irritation from solvents or resins in the carrier system.
B2B Procurement Guide
Industrial buyers should prioritize suppliers providing technical datasheets with parameters like pigment-to-binder ratio and Hegman grind fineness (target: ≤10 μm). Bulk purchases (200+ kg drums) often reduce costs by 15-20% but require verification of batch-to-batch consistency. Testing small samples for compatibility with existing formulations is recommended. Key certifications to request include REACH compliance and ISO 9001 for manufacturing quality. Logistics planning should account for the paste's classification as hazardous goods in some regions.
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