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What is a Faraday Cage?

lightning-659917_960_720[1]A Faraday cage or Faraday shield is an enclosure formed by conducting material or by a mesh of such material. Such an enclosure blocks external static and non-static electric fields. Faraday cages are named after the English scientist Michael Faraday, who invented them in 1836. An impressive demonstration of the Faraday cage effect is that of an aircraft being struck by lightning. This happens frequently, but does not harm the plane or passengers. The metal body of the aircraft protects the interior. For the same reason, a car may be a safe place to be in a thunderstorm.

37150CircuitBoard

Protektive Pak Impregnated Corrugated Box with lid

ESD control products that provide a Faraday Cage or shielding include Statshield® Metal-In and Metal-Out Shielding Bags, Protektive Pak™ impregnated corrugated with shielding layer when using a lid, and Conductive Totes. Statshield® ESD Smocks creates a Faraday Cage effect around the torso and arms of the operator and shields charges from the operator’s clothing from damaging ESD sensitive devices. (Technically, suppressing the electrical field from clothing worn underneath).

 

 

There are standard tests measuring the energy penetration of electrostatic discharges to the interior. The Shielding test method per Packaging standard ANSI/ESD S541 is ANSI/ESD STM11.31 and the required limit is less than 50 nanoJoules of energy.

ESD shielding packaging is to be used particularly when transporting or storing ESD sensitive items outside an ESD Protected Area. Per Packaging standard ANSI/ESD S541 section 6.2 Outside an EPA “Transportation of sensitive products outside of an EPA shall require packaging that provides:

  1. Low charge generation.
  2. Dissipative or conductive materials for intimate contact.
  3. A structure that provides electrostatic discharge shielding.”

Definitions from the ESD Association Glossary ESD ADV1.0 include: Faraday cage “A conductive enclosure that attenuates a stationary electrostatic field.”

Electrostatic discharge (ESD) shield “A barrier or enclosure that limits the passage of current and attenuates an electromagnetic field resulting from an electrostatic discharge.”

Electrostatic shield “A barrier or enclosure that limits the penetration of an electrostatic field.”

Note: the ESD Association sells most documents, however, the Packaging standard ANSI/ESD S541 and the Glossary ESD ADV1.0 are free downloads from www.ESDA.org (click Standards and then Documents, scroll down to find documents that can be downloaded at no charge).

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Summer Deals are Here! 10% Off Corrugated Small Component Shippers

Valid in Continental United States only.
Online orders only. This cannot be combined with any other Protektive Pak promotional offers.
Sign Up HERE | Request a sample HERE | See a list of sales reps HERE
All Items & programs are available through your participating distributor | Submit your question HERE

New Black Foam Small Component Shippers

  • Efficient means of shipping or storing ESD sensitive circuit boards and other items in accordance with ANSI/ESD S20.20 & ANSI/ESD S541
  • Conductive black foam is non-contaminating, non-corrosive, and non-sloughing
  • Conductive black foam used for shipping or storing small components when the components can not come in contact with pink foam
  • Conductive crosslink black polyethylene cushion grade foam (3/8″ thick, Rv < 10^4 ohms) laminated to top, and conductive crosslink black polyethylene pin insertion grade foam
  • Impregnated corrugated static dissipative surface of 1x 10E6 to < 1x 10E9 ohms per ANSI/ESD S11.1 and IEC 61340-2-3
  • Black foam is best for long term use
  • No assembly required
  • Made in United States of America
Item Insert Size 1* 100+* 500+* 1000+*
39508 2-1/2" x 1-1/4" x 1" $1.70 $1.60 $1.42 $1.35
39536 3-7/16" x 2-1/8" x 1" $3.03 $2.85 $2.51 $2.38
39542 3-3/4" x 3-3/4" x 1" $2.66 $2.53 $2.28 $2.16
39550 7" x 3-1/2" x 1" $4.95 $4.65 $4.09 $3.89
*The prices in the Protektive Pak Online Catalog supersede all pricing
on new product announcements and may change without notice.
Sign Up HERE | Request a Sample HERE | See list of sales reps and distributors HERE
All items & programmes are available through your participating distributor | Submit your questions HERE

Do Protektive Pak In-Plant Handlers need to have lids on while ESD sensitive items are in them? How do these Protektive Pak In-Plant Handlers work?

Outside the ESD protected area (EPA), the Protektive Pak lids need to be in place to provide the electrostatic discharge shielding ESD control property which is required by the Packaging standard ANSI/ESD S541. Per section 6.2 Outside an EPA “Transportation of sensitive products outside of an EPA shall require packaging that provides: 1. Low charge generation. 2. Dissipative or conductive materials for intimate contact. 3. A structure that provides electrostatic discharge shielding.”

Inside the EPA, it would still be a good idea to have the lid in place, but it is not a requirement. The Protektive Pak impregnated corrugated has a buried shielding layer. In shielding, we utilize the fact that electrostatic charges and discharges take the path of least resistance. The charge will be either positive or negative; otherwise the charge would balance out and be no charge.

Like charges repel and so the electrostatic charge will reside on the outer conductive surface.

A Faraday Cage effect can protect ESDS contents in a container with a shielding layer (this is what a shielding bag has). This Faraday Cage effect protects people in real life when a lightning bolt strikes an airplane or automobile with the charge residing on the outer metal fuselage or car body.

The Faraday cage effect causes charges to be conducted around the outside the surface of the conductor. Since like charges repel, charges will rest on the exterior.

To complete the enclosure, make sure to place lids on boxes or containers, and close shielding bags. Packaging with holes, tears, or gaps should not be used as the contents may be able to extend outside the enclosure and lose their shielding as well as mechanical protection.

To ask an ESD question Click Here

To view In-Plant Handlers Click Here

Introducing Protektive Pak’s Corrugated Reel Holders



  • Economical method of storing reels
  • Compact for use in limited space areas
  • Convenient for use on workstation
  • Available in 7” and 13”
  • Reel Storage Containers are stackable
    and include identification labels
  • Reusable, ensuring best value
  • Dissipative impregnated corrugated material
  • Each reel storage box has 5 cells for efficient storage
  • Partitions are easily removed to accommodate wider reels
  • Lead-free RoHS compliant
  • Made in the United States of America

100% Recycled – 100% Recyclable

Item Description 1-49 50+
37566 Reel Holder, Corrugated,
7”, 5 Slots
$11.58 $10.42
37567 Reel Holder, Corrugated,
13”, 5 Slots
$14.30 $13.60
Place an order HERE | Request a sample HERE
See a list of Distributors and Sales Reps HERE
All items & programs are available through your participating distributor
Submit your question HERE

Introducing the New Shipper Saver Plastek Storage Containers

Shipper Saver Plastek Storage Containers

Plastek™ Features

  • Provides physical protection with conductive material providing reliable path-to-ground
  • Includes wire frame for extra strength
  • Product ships flat – easy assembly
  • Rtt: 10E2 – 10E4 ohms
  • Made in the United States of America

Options

  • Conductive Plastic Handles available
  • Static Dissipative Foam for bottom, providing ESD and shock protection
  • Document Holders
  • Lid
  • Made in the United States of America
    Click here to view New39300
Item Cell Size
1-24
25-49
50-99
39300 17” x 13” x 8-3/4″
$44.44
$43.10
$41.81
39301 17” x 13” x 10-3/4″
$48.60
$47.15
$45.73
39302 18-5/8” x 15” x 5-7/8″
$43.11
$41.82
$40.57
39303 18-5/8” x 15” x 8”
$48.28
$46.84
$45.43
39304 18-5/8” x 15” x 12”
$56.45
$54.76
$53.11
39305 22-7/8” x 12-7/8” x 6″
$44.50
$43.17
$41.88
39306 22-7/8” x 12-7/8” x 18-1/4″
$74.71
$72.47
$70.29
Addtional Quantity Price Breaks Available
Sign Up HERE | Request a sample HERE | See list of sales reps and distributors HERE
All items & programs are available through your participating distributor | Submit your questions HERE