ESD 对比 Moisture Barrier Bag
ESD shielding bags protect against static discharge. Moisture barrier bags (MBB) protect against humidity. Both are used in electronics packaging. Some bags combine both functions. Choose based on the threat: static, humidity, or both.本文从材质、成本、应用场景等维度进行全面对比。
详细对比
| 方面 | Option A | Option B |
|---|---|---|
| Primary protection | Static discharge (ESD) | Humidity (moisture vapor) |
| Material | Metal layer (Al, Ni) + plastic | Foil layer + plastic |
| Surface resistivity | < 10^5 ohm | N/A |
| MVTR (moisture transmission) | 0.5-2 g/100in²/24h | 0.02-0.5 g/100in²/24h |
| Static shielding | Yes (>30 dB attenuation) | Some (if metalized) |
| Cost | Lower | Higher |
| Best for | Static-sensitive components | Moisture-sensitive (MSL) components |
| Common standards | ANSI/ESD S541, IEC 61340-5-1 | IPC/JEDEC J-STD-033, MIL-PRF-81705 |
结论
Choose ESD bag for: PCBs, ICs, semiconductors (dry environment). Choose MBB for: MSL components, overseas shipping, long-term storage. For both threats (most common), use a combo bag (ESD + MBB).根据具体需求选择合适的方案。
Can one bag do both??
Yes, combo bags (ESD shielding + moisture barrier) are common. They meet ANSI/ESD S541 and IPC/JEDEC J-STD-033. These are sometimes called 'ESD moisture barrier bags' or 'metal-in ESD bags with foil layer'.