Conductive vs Dissipative Foam
Conductive and static dissipative foams are both used to protect ESD-sensitive electronics. Conductive (10^3-10^5 ohm) rapidly dissipates charge. Static dissipative (10^6-10^9 ohm) is slower, safer for sensitive components. Both meet ANSI/ESD S20.20.
Detailed Comparison
| Aspect | Conductive | Dissipative |
|---|---|---|
| Surface resistivity | 10^3 - 10^5 ohm | 10^6 - 10^9 ohm |
| Charge dissipation | < 0.1 sec | < 1 sec |
| Cost | Higher | Lower |
| Best for | Class 0 (very sensitive) | Class 1 (most electronics) |
| Color | Black (carbon loaded) | Black or pink (anti-static) |
| Common standards | ANSI/ESD S20.20, IEC 61340-5-1 | ANSI/ESD S20.20, IEC 61340-5-1 |
| Material | Polyurethane + carbon black | Polyethylene or PU + additives |
| Reusability | Limited (carbon sheds) | Good (no shedding) |
Verdict
Choose conductive for: very sensitive ICs, semiconductors, explosives. Choose static dissipative for: most electronics, PCBAs, computers, hard drives. Static dissipative is more common and reusable.
Is pink foam the same as static dissipative?
Pink anti-static foam is typically static dissipative (10^6-10^9 ohm). It works for most electronics. Black conductive foam (10^3-10^5 ohm) is for very sensitive components. Choose based on your ESD class.