Fairly regularly we are seeing low charging or antistatic Pink Poly bags being used for the wrong application. These bags are made from a tinted polyethylene material with an antistatic coating that can wear away. This turns the bag insulative and high charging over time, making it noncompliant to ANSI/ESD S541 recommendations.
They also lack discharge shielding protection which makes components within the bag susceptible to ESD event damage. It is this distinction that is most important – as Pink Poly bags don’t provide shielding, they should not be used to carry ESD Susceptible (ESDS) items outside the EPA, i.e. when the sensitive item isn’t grounded. Per ANSI/ESD S541-2018, Table 1. ESD Protective Packaging Requirements by Location, Discharge Shielding is Required for Outside the EPA (UPA).
SCS Metallized Shielding bags are constructed from a metalized polyester film and a low charging polyethylene laminate. This provides the bags with a shielding layer that creates a Faraday cage protecting the ESD sensitive components within the bag from possible ESD event damage. The low charging inner layer and outer layer of the bag prevent tribocharging from occurring, minimizing the build-up of ESD charges when handling components. This low charging layer is longer lasting than a pink antistatic bag.
Per ANSI/ESD S541-2018 – Table2. Summary of ESD Protective Properties
“Protects packaged items from the effects of static discharge that are external to the package and limits current flow through package”
Per ANSI/ESD S541-2018 – Per 7.3.1 Electrostatic Discharge Shielding
“Electrostatic discharge shielding materials are capable of attenuating an electrostatic discharge when formed into a container such as a bag”
Watch our video for a simple demonstration on how pink poly bags differ from static shielding bags:
- EM Eye – ESD Event Meter Discharging Shielding validation
- 718 Static Sensor Surface Voltage Test (The 718 meter has been upgraded to the 770716)
For more information on the differences between these two materials, and a demonstration on how to test per ANSI/ESD S11.31 and ANSI/ESD S541 visit this page.