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ESD and Static Control Questions Answered

QUESTION: We always face the problem of selling anti-static/dissipate of our current vinyl floors to our clients. What is the solution for client satisfaction that he wants to make sure if the vinyl floor is antistatic or not and if the vinyl floor work as dissipate of current.

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QUESTION: May I ask what should be the required Ground Rod-to-earth resistance? is it less than 2ohms or less than 25ohms?

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QUESTION: What does ASTM F2413-05 compliant mean?

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QUESTION: What is the difference between anti-static and static dissipative floors?
Which floor will be better to use if I'm going to have an electronic assembly line?

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QUESTION:

a. What is the difference between two layer and three layer ESD PVC materials?

b. Which one will be advisable for flooring?

c. Some ESD material Suppliers claim that copper mesh grid is not required in case of two layer flooring. Is it correct and if so, why only in case of three layer?

d. What is the recommended size of the copper grid while doing the ESD flooring and what should be the thickness of the copper foil?

e. What should be minimum ESD earth resistance and voltage?

f. How do we do the copper mesh earthing in case of epoxy floor?

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QUESTION: How does the ESD gloves / aprons/ bunny suit help for static discharge? Will it not be mandatory to wear the wrist band or footwear/ heel strap too along with the above?

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QUESTION: May I know the standard procedure and standard. Parameters (viz; surface resistivity / surface to or person to ground resistance , decay time, or any other parameter if applicable) and recommended values for confirming the worthiness of the following ESD item?

a. All ESD packaging item.
b. ESD floor and work surfaces
c. ESD clothings
d. ESD foot wears
e. ESD handling item viz., brushes / bins / PCB rack

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QUESTION: How does a wrist bandcum footwear ground tester differ from the work station monitor? Can we not use only the work station monitor when it can monitor the worthiness of wrist strap even?

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QUESTION: What is the difference between Low static 3.5kv carpeting and static dissipative carpeting? When used on walls is 3.5kv carpeting ok in electronic equipment rooms?

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QUESTION: What is the difference between the symbols used in ESD warning signs / labels: yellow hand w/ black background; black hand w/ yellow background; attention; triange/hand with arch; warning; etc. and how do you decide which one to use?

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QUESTION: I'm having a hard time understanding the difference between an ESD Control "Program" and an ESD Control Program "Plan"...

Can someone explain what is required? Do I need two documents, one "Program" and one "Plan", do I need to develop a single ESD document?

I'm not sure what the difference between a program and a plan is.

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QUESTION: Why can't bare or sealed concrete be used as a method for controlling static electricity in a electronics manufacturing environment verse utilizing a Conductive or Static Dissipative covering and/or coating?

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QUESTION: I am looking for a flooring system suitable for use in a pharmaceutical manufacturing space where Class I-B flammable liquids and vapors are routinely present. Is conductive epoxy the best choice? Is an integral copper grounding grid needed?

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QUESTION: How do you clean the floor, can it be waxed, and if so what type of wax?

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QUESTION: We are removing old vinyl tile and replacing with ESD protective tile. Wondering if ESD conductive or dissipative is best. Our business is dehydration baking, final functional testing and packaging semiconductor IC's with design circuits typically in .25 micron range. Need recommendations on conductive vs. dissipative and epoxy vs vinyl tile. Area is not high traffic. Thanks.

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QUESTION: Hi, my name is Fadzli. I have one question/problem that I like to ask and hope you can help me and it is regarding an experiment to test a bench top air ionizer. From the attached documents, there are 2 graphs of decay time versus effective distance, one for decay time on negative charges and the other one for decay time on positive charges. As you can see, the closer the bench top air ionizer (effective distance), the lesser the decay time will be (which the decay time is the time it takes to dissipate the charges on the plate which can be seen from the 3 pictures attached). My question is, why is it during the distance of 20 to 24 inch the graph line become a straight line (saturated) and not growing linearly like the other points?

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QUESTION: How important is humidity in the control of electrostatic problems? What is the approximate decrease in electrostatic control if the humidity is reduced from 50% to 35% RH?

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QUESTION: We are an explosives manufacturer and are looking to repaint our conductive flooring. We subscribe to the standard NFPA requirements for conductive flooring. What is the best and most economical product to apply? Consider that the environment would be expected to be consistently wet.

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QUESTION: We have an ESD tile floor in our testing lab. During a recent AS9100 audit we were asked why we don't use wrist straps. Since our ISO9100 & 2 certified calibration provider only uses them when they have to certify the repair of a system and we don't do that do we need more than the flooring? (booties, straps, etc.)

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