Carbon Black

material

A fine carbon powder additive used in plastics to provide black coloration, UV protection, electrical conductivity, and reinforcement properties in polymer compounds.

In Simple Terms

Carbon black is a black powder made from burning hydrocarbons that gets mixed into plastic resins. It turns plastics black while also making them stronger, more resistant to UV damage, and sometimes electrically conductive depending on the loading level.

Why It Matters

Carbon black is critical for outdoor plastic applications requiring UV stability and black color. It affects material properties like tensile strength and conductivity, impacting both processing parameters and end-use performance in automotive, wire/cable, and construction applications.

Technical Details

Carbon black particle size (10-500nm) and surface area determine reinforcement and conductivity. Typical loading ranges from 1-3% for coloration to 15-40% for conductivity. Different grades (N220, N330, N550) offer varying reinforcement levels. Dispersion quality affects mechanical properties and requires proper melt compounding techniques.

Real-World Examples

HDPE pipe compound specification

Adding 2.5% carbon black N330 to HDPE provides UV protection for outdoor water pipes while maintaining processability during extrusion

Conductive PP masterbatch production

Using 25% carbon black in PP carrier resin creates a masterbatch for antistatic applications with let-down ratios of 10:1 in final compounds

Quality control testing

Carbon black content measured by TGA analysis to verify 3% loading meets automotive part specifications for UV resistance