Choosing the Right ESD Packaging: Shielding, Static‑Dissipative & Moisture Protection

A practical buyer’s guide to selecting the right packaging for sensitive components.

Why Packaging Is One of the Most Overlooked ESD Controls

Most ESD events occur when components leave the workstation — during transport, staging, kitting, or storage. Packaging is your product’s last line of defense, yet it’s one of the most misunderstood categories in static control. Different packaging materials behave very differently under charge — choosing the wrong one can mean the difference between a safe product and latent damage that appears weeks later in the field. For a complete guide to building and maintaining an ESD control program, visit our ESD Program Essentials hub.

Three Major ESD Packaging Categories — and When to Use Each

1. Static-Dissipative Bags (Pink Poly)

Static-dissipative bags are made from polyethylene with dissipative additives that prevent triboelectric charge generation on the bag surface. They do not shield against external electrostatic fields — a charged person or object touching the outside of the bag can still discharge through it to the contents. Suitable for: inner packaging within a shielded outer bag, non-ESDS components that need basic static protection during handling, and components stored inside an ESD Protected Area.

2. Static Shielding Bags (Metal-In / Metal-Out)

Shielding bags are the required packaging for ESDS components during storage and transit outside an ESD Protected Area. The metallic layer creates a Faraday cage that attenuates external electrostatic fields, preventing them from reaching the contents. Metal-in bags have the metallic layer on the inside (more flexible, lower shielding effectiveness); metal-out bags have the metallic layer on the outside (higher shielding effectiveness, more rigid). Both types must be heat-sealed or zip-locked to be effective — an open shielding bag provides no protection.

Desco Shielding Bags · All ESD Bags

3. Moisture Barrier Bags (MBB)

Moisture barrier bags are required for PCBs, BGAs, and moisture-sensitive devices (MSDs) rated MSL 2 and above per IPC/JEDEC J-STD-033. MBBs must be used with desiccant and a humidity indicator card (HIC) — the desiccant absorbs moisture inside the sealed bag; the HIC provides visual confirmation that humidity has remained within specification. A pink dot on the HIC means the desiccant is saturated and the package must be resealed with fresh desiccant before the components can be used.

Don’t Forget Labels, Humidity Cards & Desiccants

ESD and MSL packaging is a system, not a single SKU. A shielding bag without an ESD warning label on the outside may be handled without ESD precautions by receiving personnel — defeating the purpose of the packaging. Combine bags with:

• MSL & ESD Warning Labels — required on outer packaging per ANSI/ESD S20.20
• Desiccant Packs — required inside MBBs for MSL 2+ components
• Humidity Indicator Cards (HICs) — required inside MBBs for reflow readiness verification

Frequently Asked Questions About ESD Packaging

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Related Resources

• ESD Program Essentials — Complete guide to building and maintaining an ESD control program
• ESD-Safe Component Storage — Moisture barrier bags, desiccants, dry cabinets, and humidity indicator cards
• Industrial Packaging & Shipping Solutions — Packaging resources for electronics and industrial applications
• ESD Packaging Shelf Life