esds-183.gif - 2688 Bytes esdcorner.gif - 2022 Bytes March 2000
Issue 3, Volume 3
   Dr. ZAP
Should I use Conductive or Dissipative materials?

There may be some confusion with the terms "conductive" and "dissipative". If the material has a surface resistance of 1x10^4 ohms or greater but less than 1x10^11 ohms then it is dissipative. Dissipative materials do conduct, just at a slower rate then conductive materials. If a material is too conductive (< 1x10^4 ohms) there is a chance that a charged conductor touching this material may experience an ESD event. Dissipative materials are better choices for controlling ESD events for work surfaces, packaging, etc. Refer to our white paper on ESD Discharge Times

The recommended electrical resistance for Flooring from ANSI ESD S 7.1 and ANSI/ESD-S20.20 is <1x10^9 ohm RTT which starts from the upper dissipative range but can include the conductive range. The conductive range is less than 1x10^4 ohms (so 9x10^3 ohms is conductive). Over 1x10^4 ohms (to 9x10^10) is considered dissipative.

The standard is flexible so the end user's ESD control program can be written to specify the floor material to satisfy their specific internal requirements.

However in general, floor materials in the upper conductive range or low dissipative range work well for ESD control floor coverings. Since dirt and other contaminant are typically insulators, the flooring will measure less than 10^9 ohms throughout the maintenance cycle. All of ESD's Floor mat materials, as well as Statproof® Dissipative Floor Finish meet the electrical requirements for ANSI/ESD-S20.20. Conductive floors will provide a somewhat more rapid charge decay, but ESD safe floors with Statproof® Dissipative Floor Finish properly applied will limited tribocharging to under 50 volt charge generation.


New Improved Combo Tester (Item # 41201)

  • Enhanced touch contact, positive soft-touchswitching, rugged design
  • Black Case, differentiates from older units
  • Rocker switch replaces auto-switch to differentiates tests

Chair Covers (Item # 16425)

  • Meets ESD STM12.1
  • Turn regular chairs into ESD chairs
  • One size fits standard size chairs
  • Covers both seat and chair back
 ESDA NE Chapter's Regional Tutorial Program    Click here for more details

 May 15th and 16th at the Boston University Conference Center in Tyngsboro, MA

  • "ESD Basics" by Lou DeChiaro, Lucent Technologies
  • "ESD Audits" by Larry Fromm of Hewlett Packard
  •  Panel Discussion on "ESD Common Myths"

Q1: During the past few months I have been trying to change our old process of transporting our circuit boards around our factory from the use of 'CONDUCTIVE BAGS' to the use of 'DISSIPATIVE BAGS'. I have been unsuccessful due to the fact I cannot prove that this will benefit the reliability of our products. How can it be proven 'Practically' or 'Theoretically' to Justify the extra costs incurred in the use of dissipative bags? - Tony, Southampton, United Kingdom   ANSWER 1

Q2: For a working area whereby wrist strap is not convenient to be used, can a grounded (connected to mains earth) metal sheet be used instead of conductive floor? Is this setup complied to the safety requirement of ESD setup? Is the operator wearing heel straps and working on the metal floor exposed to "Electrical Shock" if ELCB fails? - HY, Bayan Lepas, Penang, Malaysia    ANSWER 2

Q3: Some partners are using conductive benches and they considered those benches as ESD safe. Beside operator safety on live conductors, what is the ESD awareness with this conductive benches? - Anonymous, Zapopan, Mexico   ANSWER 3

Find more ESD Q&A here

  HOT TIPs of the MONTH
An ESD control program is not complete until you set-up an auditing program. Refer to our white paper on ESD Audits for more details.

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