Category Archives: ESD TR53
To obtain technical information and guidance on ESD control, there are a number of sources, many available at no charge.
The ESD Association sells most of their documents, but a number are available as complimentary downloads. Per ANSI/ESD S20.20, Compliance Verification of ESD Protected Area’s (EPA) ESD control items is to be per ESD TR53; ANSI/ESD S20.20 and Compliance Verification ESD TR53 are available as complimentary downloads from http://www.ESDA.org.
- Click “Standards”
– Then “Documents” and scroll down.
– You can open and then save as a .pdf to your computer hard drive.
Also available as complimentary downloads are the Packaging standard ANSI/ESD S541 and the Glossary of Terms ADV1.0 among others.
ANSI/ESD S20.20 ESD Control Plan
This standard provides administrative and technical requirements for establishing, implementing, and maintaining an ESD Control Program. It provides a lot of flexibility. For example, it doesn’t require that you use table mats. However, it specifies the required limits if you do use worksurface mats.
ANSI/ESD S541 ESD Packaging
This standard describes the packaging material properties needed to protect electrostatic discharge (ESD) sensitive electronic items, and references the testing methods for evaluating packaging and packaging materials for those properties.
ESD TR53 Compliance Verification of ESD Protective Equipment and Materials
This technical report describes the test methods and instrumentation that can be used to periodically verify the performance of ESD protective equipment and materials. It also includes troubleshooting tips.
ADV1.0 Glossary of Terms
Definitions and explanations of various terms used in Association Standards and documents are covered in this Advisory. It also includes other terms commonly used in the electronics industry.
ESD TR 20.20 ESD Handbook (Companion to ANSI/ESD S20.20)
Produced specifically to support ANSI/ESD S20.20 ESD Control Program standard. It focuses on providing guidance that can be used for developing, implementing, and monitoring an ESD control program in accordance with the S20.20 standard. The TR20.20 is an excellent source of ESD control information. It is 132 pages long and sold by the ESD Association either as a paper version or a .pdf version. For ESD Association members, the price is $225.00 or $175.00 for the .pdf version. Pricing is $275.00 and $225.00 respectively for non-members.
The ESD Handbook would be the best educational tool for an overall review of ESD control. It can be purchased on the ESD Association website http://www.ESDA.org.
Desco also has some published articles and other information on our website that is interesting and informative – .http://Desco.DescoIndustries.com/Technical.aspx
The authors of a recent article in InCompliance Magazine titled Early Life Failure of Dissipative Workstation Mats, have confirmed that Desco’s Statfree® T2 was the top performing worksurface mat (Mat ID#4 in the article) in their study. To read the rest of the article click HERE
Part of any good ESD Control Program is periodic verification of the specs of products being used for the ESD Control Plan. The most obvious example of periodic testing is when operators test their foot grounders or wrist straps before entering an ESD Protected Area. The ESD Association’s ESD TR53-01-06 Compliance Verification of ESD Protective Equipment and Materials describes the test methods and instrumentation that can be used to periodically verify the performance of ESD protective equipment and materials. Plexus Manufacturing Solutions in Neenah, WI noticed during periodic verification of their workstation mats, that the mats were drifting out of spec and wanted to determine what was causing the mats to fail. Through their in house tests, they concluded that:
- A solid ESD control program including compliance verification periodic testing with data collection provides valuable and useful information.
- Factory fluorescent lighting, likely from ultraviolet (UV) radiation, can have a measurable effect on the electrical properties of ESD dissipative mats over time.
- Different mats tolerate or resist the effects of factory fluorescent lighting.
- Since this experiment did not take into account lot to lot variation at the supplier for each mat P/N, future mats purchased will require lot traceability information to be stamped on the bottom of the roll, every 3 feet minimum
- The ESD Association technical report ESD TR4.0-01-02 Worksurfaces and Grounding Survey should consider adding ultraviolet light resistance as a property to consider in the Worksurface Selection Guide.
Desco’s Statfree® T2 mats include Ultraviolet (UV) stabilizer additives in the mat formula to stabilize color retention, ensure ESD performance over time and eliminate surface layer deterioration resulting in cracking when the product is flexed. Additionally, we mark lot traceability information on the bottom of the roll every 3 feet to provide tracking information for lifespan of the product and to ensure quality control.
For Compliance Verification periodic testing, how frequently should an ESD control item be checked?
It is user defined, so it is up to you. Best practice is to test each and every ionizer, but you could also decide (if you got good results) to test a percentage of a particular ESD control item. The frequency and sampling percentage should be documented in your written ESD control plan. Depending upon your test results, you would then want to tighten or relax the numbers.
This is the guidance from ESD TR53 Compliance Verification of ESD Protective Equipment and Materials.
The objective of the periodic test procedures listed in this document is to identify if significant changes in ESD equipment and materials performance have occurred over time.
Test frequency limits are not listed in this document, as each user will need to develop their own set of test frequencies based on the critical nature of those ESD sensitive items handled and the risk of failure for the ESD protective equipment and materials.
Examples of how test frequencies are considered:
Daily wrist strap checks are sufficient in some applications, where in other operations constant wrist strap monitoring may be used for added operator grounding reliability. Packaging checks may depend on the composition of the packaging and its use. Some packaging may have static control properties that deteriorate more quickly with time and use and some packaging may be humidity dependent and may have limited shelf life.
Some materials, such as ESD floor finishes, may require more frequent monitoring because of their lack of permanency. Other materials, such as ESD vinyl floor covering, may require less monitoring. The testing of a floor should also be considered after maintenance on the floor has been performed.”
Desco has long been a supporter of the ESD Association and we have always encouraged our customers to purchase copies of standards and other documents published by the organization ANSI/ESD S20.20 (which is also available for free from the ESDA) specifies that compliance verification testing be per ESD TR53. This is the spec that companies should note in their written ESD control plans. ESD TR53 describes the test methods and instrumentation that can be used to periodically verify the performance of ESD protective equipment and materials. It also includes troubleshooting tips.
Currently the ESDA is offering a complimentary copy of the ESD TR53 to people that register on their website.