Conductive powders enable engineers to control electrical resistivity in coatings, plastics, inks, and composites — from static-dissipative flooring to high-performance EMI shielding enclosures.
What Is Conductive Powder
The three principal types are: conductive carbon black (lowest cost, black color), conductive titanium dioxide (SEMIJUN 3000 type, light-colored), and antimony-doped tin oxide (ATO) powder. Each occupies a different cost-performance-color space.
| Metric | Value |
|---|---|
| Carbon black vol. resistivity at percolation | 10⁻² Ω·cm |
| EMI shielding effectiveness (Ag/Ni coating) | 60 dB |
| Antistatic coating surface resistivity target | 10⁶–10¹¹ Ω/sq |
| Min. ATO particle size for transparent films | 0.1 µm |
Antistatic Coatings & Flooring
Antistatic coatings (10⁶–10¹¹ Ω/sq) use conductive TiO₂ or low-dose carbon black for gradual charge dissipation. ESD coatings (10⁴–10⁶ Ω/sq) require higher carbon black or silver-coated powders.
Color advantage: SEMIJUN 3000 TiO₂ enables light-colored antistatic coatings — impossible with carbon black — essential for cleanrooms and food processing areas.
ESD Flooring
Static-dissipative epoxy floors require 10⁶–10⁹ Ω/sq; carbon black at 8–15% or conductive TiO₂ at 25–40%.
Antistatic Packaging Film
BOPP and PE films use carbon black or ATO at low loading to achieve 10⁸–10¹¹ Ω/sq.
Cleanroom Walls & Ceilings
Light-colored antistatic coatings in semiconductor fabs use conductive TiO₂ to meet ESD requirements while maintaining white reflective surfaces.
Conveyor Belt Coatings
Carbon black at 10–20% prevents static sparking in fuel handling, mining, and grain processing.
EMI/RFI Shielding
EMI shielding requires surface resistivity below 10³ Ω/sq and volume resistivity below 1 Ω·cm.
| Shielding Method | Conductive Powder | Loading | SE (dB) at 1 GHz |
|---|---|---|---|
| Spray conductive coating | Silver powder / Ni-coated C | 1–2 mg/cm² | 40–60 dB |
| Carbon-loaded polymer | Conductive carbon black | 15–25% | 20–35 dB |
| Conductive primer | Carbon black / graphite | 20–35% | 25–40 dB |
| Conductive adhesive | Silver flake | 60–80% | 50–70 dB |
Conductive Inks & Printed Electronics
Fine silver or carbon powders in polymer vehicles form circuit traces, electrodes, and RF antennas in flexible electronics, RFID tags, and wearable sensors. Carbon inks are 5–20× cheaper; silver inks achieve 10–100× lower resistivity for antenna traces and interconnects.
Battery Electrode & Energy Materials
Conductive carbon black at 1–5 wt% in Li-ion cathode/anode slurries bridges active material particles, reducing internal resistance and improving rate capability and cycle life.
Conductive Powder Comparison & Grade Guide
| Type | Color | Vol. Resistivity | Cost Level | Best Application |
|---|---|---|---|---|
| Conductive carbon black | Black | 10⁻² Ω·cm | Low | EMI, ESD flooring, battery |
| Conductive SEMIJUN 3000 TiO₂ | Light gray/white | 10²–10³ Ω·cm | Medium | Antistatic coatings, cleanroom |
| ATO powder | Light gray | 10¹–10² Ω·cm | Medium-high | Transparent films, fine coatings |
| Silver powder / flake | Silver | 10⁻⁴ Ω·cm | High | Conductive inks, EMI spray |
| Ni-coated graphite | Dark gray | 10⁻³ Ω·cm | Medium-high | EMI shielding coatings |
Browse our conductive powder range for available grades with full TDS.
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Frequently Asked Questions
+What types of conductive powder are available for coatings?
The main types are conductive carbon black (10⁻² Ω·cm), conductive TiO₂ (10²–10³ Ω·cm, light gray/white), ATO powder (10¹–10² Ω·cm), and silver powder (highest conductivity, highest cost).
+What surface resistivity is needed for antistatic coatings?
Antistatic coatings target 10⁶–10¹¹ Ω/sq. ESD-protective coatings for electronics handling target 10⁴–10⁶ Ω/sq. Static-dissipative flooring aims for 10⁶–10⁹ Ω/sq per IEC 61340.
+Can conductive powder be used for EMI shielding in plastics?
Yes. Carbon black or silver-coated powder in plastic compounds can achieve 20–60 dB at 1–10 GHz. For molded parts, 15–30% carbon black loading is typical.
+How is conductive titanium dioxide different from standard TiO₂?
Standard TiO₂ is an insulator (>10¹² Ω·cm). SEMIJUN 3000 has a thin ATO coating reducing volume resistivity to 10²–10³ Ω·cm, enabling light-colored antistatic coatings.
+What is the percolation threshold for conductive powder in coatings?
For carbon black in polymer, typically 5–15% by weight; for ATO-coated TiO₂, 20–40% due to spherical shape. Above threshold, resistivity drops sharply.