Before selecting any additive, it is critical to understand fiber form, because carbon black behaves very differently depending on how fibers are produced.
Continuous fibers produced directly from a polymer melt or solution and wound at high speed.
Typical polymers
Filter pack clogging
Rapid pressure rise
Filament breakage
Optical specks in fibers
Reduced spinning speed
Filament fibers demand the cleanest, most dispersible carbon blacks available.
Short fibers produced by cutting continuous filaments into defined lengths and then spinning them into yarn.
Typical applications
Shade variation across batches
Weak fibers due to poor dispersion
Reduced UV life
A polymer-specific category that can exist as filament or staple fibers.
Why Nylon is special
Nylon fibers require ultra-clean, thermally stable, and well-dispersed carbon blacks