How to Define ESD Protective Packaging Requirements for ESD Sensitive Items

A company with an ANSI/ESD S20.20 ESD control program needs to document the program and define ESD protective packaging for ESD sensitive (ESDS) items. Packaging is to be defined for all material movement within the EPA and for outside the EPA. Best practice is to define the required packaging or material handling item on a product’s bill of materials. The ESD packaging is as important as a component part.

Customer contract packaging can take precedence, but otherwise “the organization shall define ESD protective packaging requirements, both inside and outside the EPA per ANSI/ESD S541.” [ANSI/ESD S20.20 section 8.4]

The ESD Association sells most of their documents. However, both ANSI/ESD S20.20 and ANSI/ESD S541 are available as complimentary downloads from www.ESDA.org.

The fundamentals of ESD control include grounding all conductors in the EPA. ESD packaging will have special material composition to lower the resistance so that when grounded, electrostatic charges will be removed to ground.

This is the Summary of ESD Protective Properties ANSI/ESD S541 Table 2:

Protection Property
Low charging (antistatic) Materials that have reduced amounts of charge accumulation as compared with standard packaging materials.
Dissipative or Conductive Resistance Provides an electrical path for charge to dissipate from the package.
Discharge Shielding Protects packaged items from the effects of static discharge that are external to the package.

ANSI/ESD Table 3 lists Test Methods for Electrostatic Protective Packaging:

Material Property Test Method Method Description Limits
Low Charging (Antistatic) ESD ADV11.2 Tribocharging of tubes, planar materials, bags, unit packs (vibration) User defined
Resistance
Conductive ANSI/ESD STM11.11 Surface resistance of planar materials < 104 ohms
ANSI/ESD STM11.12 Volume resistance of planar materials < 104 ohms
Dissipative ANSI/ESD STM11.11 Surface resistance of planar materials > 104 to < 1011 ohms
ANSI/ESD STM11.12 Volume resistance of planar materials > 104 to < 1011 ohms
ANSI/ESD STM11.13 Surface resistance 2-point electrode > 104 to < 1011 ohms
Shielding ANSI/ESD STM11.31 ESD Shielding of Bags < 50 nanojoules

Note that the unit of measurement for conductive and for dissipative is surface or volume resistance in ohms; not resistivity.

Statshield® bag film construction includes a metalized shielding layer. Shielding bags are designed to dissipate electrostatic charges over their surface, protecting ESDS contents from electrostatic fields and from ElectroStatic Discharge (ESD). Their surface resistance is dissipative, which is recommended when packaging in contact with the ESDS; per ANSI/ESD S541 section A.3 “Dissipative Material for Intimate Contact, to avoid rapid discharge to sensitive items, dissipative materials should be used as the layer of packaging that contacts the item.”

This is also true for enclosed Protektive Pak impregnated dissipative corrugated containers, either closed or with lid in place. The impregnated corrugated has a buried shielding layer that provides the shielding ESD control property so that ESD sensitive items can be stored or transported outside an ESD protected area.

Protektive Pak offers a number of ESD control packaging solutions, including  Protektive Pak® Impregnated Dissipative Corrugated Products, Statshield Shielding Bags, Moisture Barrier Bags, Pink Poly Bags, and Labels for use within an ESD protected area (EPA) and for shipping outside an EPA. Protektive Pak products are designed to meet ANSI/ESD S20.20 and the ESD Association Packaging standard ANSI/ESD S541; they provide a great value balancing cost and durability.

Reference:

ANSI/ESD S541 for the Protection of Electrostatic Discharge Susceptible Items Packaging Materials for ESD Sensitive Items

 

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About Protektive Pak

Protektive Pak is a leading manufacturer of ESD Material Handling and Packaging solutions. We offer a complete line of ESD Packaging products for transporting, storing and shipping of static sensitive assemblies. Our products include Storage Containers, Circuit Board Shippers, Open Bin boxes, Reel Storage Containers, Trays, Foam, Tape, Shielding Bags and much more! We also have custom manufacturing capabilities to your meet your special needs, including Thermoforming requirements. Protektive Pak offers a unique “Impregnated” corrugated material that provides greater durability than “painted” corrugated material. The buried shielding layer protects ESD sensitive items (ESDS) and minimizes sloughing and rub-off contamination. We also offer Plastek Industrial Fluted Plastic, an economical alternative to injection molded products and ideal for use where corrugated and /or paper products cannot be used. For further information, please visit our website at www.ProtektivePak.com

Posted on July 27, 2016, in ANSI/ESD S20.20, Articles, ESD Control, ESD Education, ESD Protected Area (EPA), Uncategorized and tagged , , , , . Bookmark the permalink. Leave a comment.

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