ESD bag comparison
Anti-static bags vs regular poly bags
Regular poly bags can generate and hold a static charge as items slide in and out. For most products that doesn't matter. For static-sensitive electronics - PCBs, hard drives, RAM, sensors, semiconductors - that charge can damage the part before it ever ships.
Anti-static bags are engineered to dissipate or block electrostatic discharge (ESD). Use this guide to figure out when you actually need them and which type (pink antistat, metalized shielding, or static dissipative) fits your product.
Side-by-side comparison
| Attribute | Anti-Static Bag | Regular Poly Bag |
|---|---|---|
| ESD protection | Yes - dissipates or shields against electrostatic discharge per ANSI/ESD S20.20 | None - polyethylene is a strong static generator |
| When you need it | Shipping or storing PCBs, semiconductors, RAM, SSDs/HDDs, sensors, sensitive medical electronics, BIOS chips, motherboards | Apparel, soft goods, parts, hardware, consumables - anything not static-sensitive |
| Surface resistivity | 10^9 to 10^11 ohms/sq (dissipative); <10^9 (conductive shielding) | 10^14 ohms/sq or higher - effectively insulator |
| Common types | Pink antistat (amine-treated LDPE), metalized static-shielding (silver or gray, often called "Faraday cage" bags), conductive black | Clear LDPE flat bags, reclosable bags, gusseted bags |
| Triboelectric charging | Engineered to minimize charge generation when items slide in/out | High - sliding contact builds significant surface charge |
| Visibility of contents | Pink: translucent. Metalized: opaque silver. Static-dissipative clear: see-through. | Clear or natural - high visibility |
| Cost vs regular poly | Pink antistat: ~2x. Metalized shielding: ~4-6x. Static-dissipative clear: ~3x | Lowest-cost film bag format |
| Shelf life of antistat | Pink antistat amine treatment can degrade after 1-2 years; metalized shielding does not degrade | Indefinite - LDPE itself is stable |
| Recyclability | Metalized: not recyclable curbside. Pink and dissipative: #4 LDPE store drop-off where accepted | #4 LDPE - widely accepted at grocery store film drop-off |
The three types of anti-static bags
Pink antistat (low-charge): the cheapest option. Amine-treated LDPE that prevents the bag itself from generating a static charge as items slide in. Use for general parts kitting and storage of components that are static-sensitive but not directly exposed (cabled assemblies, packaged ICs, accessories). Does not shield against external ESD events.
Metalized static-shielding (silver): a multi-layer film with a conductive metal layer that creates a Faraday cage. Use for bare PCBs, exposed semiconductors, hard drives, and anything that ships through warehouses or trade-show floors where external ESD is a real risk. This is what laptop motherboards and graphics cards ship in.
Static-dissipative clear: transparent film that drains charge slowly to ground. Used when you need to see contents clearly (sensor inspection, inventory counts) without risking a fast discharge that would damage parts.
When to choose which
Choose anti-static bags when: any part of the product BOM has an ESD susceptibility class - generally anything with exposed leads, a circuit board, NAND flash, or labeled "Class 0/1/2 ESD sensitive." When in doubt for electronics, default to metalized shielding bags for the bare boards and pink antistat for the outer kitting bag.
Choose regular poly bags when: contents are non-electronic (apparel, soft goods, hardware, food-grade items in approved film, consumables). Paying for ESD bags here is wasted spend.
Common mistake: using pink antistat alone for bare PCBs. Pink antistat prevents the bag from charging, but does not shield against an external ESD strike. For bare boards, use metalized shielding bags.