How to Choose Conductive Compounds: A Complete Guide
Chinese manufacturer INCHR supplies conductive compound, conductive masterbatch, and customized electrical conductive plastics to achieve yo
Conductive compounds—polymers infused with conductive fillers like carbon black or metal particles—are critical for static control, EMI shielding, and electrical conductivity in industries from electronics to automotive. But with endless formulations available, selecting the right one requires focusing on 5 key factors. Here’s your step-by-step guide.
1. Define Your Conductivity Needs
Start with the surface/resistivity range your application demands—this eliminates 80% of unsuitable options:
Antistatic (10⁶–10¹¹ Ω/sq): For ESD protection (e.g., electronic packaging, PCB trays).
Dissipative (10³–10⁵ Ω/sq): Ideal for EMI shielding (e.g., smartphone enclosures, medical device housings).
Highly conductive (<10³ Ω/sq): Needed for electrical components (e.g., EV battery busbars, sensor leads).
Avoid overspecifying—highly conductive compounds cost more and may add unnecessary weight.
2. Match the Polymer Matrix to Your Environment
The polymer base dictates mechanical strength, temperature resistance, and chemical compatibility:
PEEK/PEI: For high-heat applications (up to 260°C) like aerospace electronics or industrial ovens.
PP/PE: Budget-friendly choices for low-temperature uses (e.g., consumer goods packaging, conveyor belts).
PPS/PBT: Resist chemicals (oils, solvents) — perfect for automotive underhood parts or chemical processing equipment.
Always test matrix compatibility with your operating conditions (e.g., humidity, corrosive fluids).
3. Select the Right Conductive Filler
Fillers impact cost, conductivity, and processability:
Carbon black: Lowest cost, but requires high loading (20–30%) which can stiffen the polymer. Best for non-structural parts (e.g., static-dissipative films).
Carbon nanotubes (CNTs): High conductivity at low loading (1–5%), preserving flexibility. Great for precision parts (e.g., sensor housings) but pricier.
Metal particles (silver, copper): Ultra-high conductivity, but prone to corrosion. Use only for indoor, low-moisture applications (e.g., printed electronics).
4. Ensure Processing Compatibility
Your manufacturing method will narrow options:
Injection molding: Choose compounds with good flow (e.g., CNT-filled PBT) to fill complex molds.
Extrusion: Opt for low-viscosity formulations (e.g., carbon-black-filled PE) for films or tubes.
3D printing: Look for pellet-based or filament-grade compounds (e.g., conductive ABS) compatible with your printer.
5. Verify Compliance & Supplier Quality
Check industry standards: RoHS (electronics), FDA (food/medical), or UL94 (flame resistance).
Ask suppliers for test reports (resistivity, thermal stability) — avoid those without third-party validation.
Request samples first! Test conductivity, durability, and processability in your actual workflow before bulk ordering.
By aligning conductivity needs, matrix properties, and processing requirements, you’ll choose a conductive compound that balances performance and cost.
