CoreBlack™ BiS | High-Contrast Black Additive for Coatings & Plastics
Bismuth Sulfide–Based functional black for deep tone, fast color development, and formulation-friendly dispersion (solvent / water / plastic masterbatch routes).
CoreBlack™ BiS is a bismuth sulfide (BiS)-based functional black additive designed for coatings and plastics where you want strong blackness and clean processing without relying on conventional carbon black loading. It is built for manufacturers who need stable tone, controllable viscosity, and repeatable dispersion across different binder systems.
Compared with “high-structure” carbon blacks that can spike viscosity or cause conductivity/migration concerns, CoreBlack™ BiS is positioned as a contrast-building black for decorative and functional systems—helping you reach deep tone with predictable formulation behavior.
Typical positioning
Coatings: deep black tone, stable shade control, compatibility with common resin families.
Plastics: black coloration and tone tuning in compounds/masterbatches where process stability matters.
Supply note: Final performance depends on binder, dispersant package, and shear history. Kela can provide application guidance and recommended starting dosages for your system upon request.
High blackness & tone stability — designed to achieve deep tone with consistent shade control across batches.
Formulation-friendly rheology — reduces the “viscosity jump” often seen with high-structure carbon blacks.
Lower risk of unintended conductivity — suitable where carbon-black conductivity is a concern (final result depends on your system).
Dispersion-friendly — works with common dispersion workflows (pre-dispersion, letdown, masterbatch route).
Broad compatibility — supports typical coating binders and plastic carrier systems with proper dispersant selection.
Process robustness — stable under typical industrial mixing and compounding conditions.
Recommended Use Guidance
Coatings (starting range): 0.5–5.0% on total formulation (optimize for tone/viscosity/film build).
Plastics (starting range): 0.1–3.0% in compound; masterbatch route recommended for tight color control.
Dispersion: pre-wet with compatible dispersant; use medium–high shear until gloss/tint strength stabilizes.
Typical Data (guide values)
Item
Typical
Notes
Chemistry
Bismuth sulfide based (BiS)
Chemistry • Functional black additive
Appearance
Black powder
—
Recommended process
Dispersion / masterbatch
Depends on system
Heat resistance
System-dependent
Validate in resin & process window
Light/weathering
System-dependent
Validate with your binder/UV package
FAQ
Q1: Is CoreBlack™ BiS a direct replacement for carbon black?
No. It is a blackness/contrast solution aimed at improving formulation behavior and tone control in certain systems. Run side-by-side trials to confirm tint strength, rheology, and durability targets.
Q2: Will it affect electrical properties?
CoreBlack™ BiS is positioned for applications that want to avoid unintended conductivity from carbon black. Final electrical behavior depends on loading, binder, and additives—please validate with your specs.
Q3: What dispersion equipment is recommended?
Coatings: high-speed disperser, bead mill, or equivalent. Plastics: masterbatch + twin-screw compounding for best consistency.
Q4: Any handling considerations?
Use standard powder handling best practices: dust control, local exhaust ventilation, PPE per SDS, and avoid inhalation exposure.
Entities
Bismuth sulfide
Functional black additive
Carbon black alternative (formulation-dependent)
Coatings dispersion
Plastic masterbatch
Rheology control
Tint strength
Migration / blooming (risk management)
Sources
Internal application positioning; final performance to be confirmed by customer validation and project-specific TDS/SDS.
Application area
Industrial & protective coatings: deep black topcoats, primers, equipment coatings, metal coatings
Automotive & transportation: interior/exterior black components coatings; plastic parts coloration
Electronics housings: black compounds where stable processing and controlled properties matter
Packaging & consumer goods: black plastics and coatings requiring consistent shade
Masterbatch & compounding: tone tuning and blackness build in engineering plastics
Specialty coatings: systems sensitive to viscosity rise or migration concerns