Static Consultants Notebook

It's hard to see how a light could be damaged by s...

2009-07-23T09:33:27.410+01:00

It's hard to see how a light could be damaged by static electricity from someone just walking past. If they touched the light, that might be another matter. Maybe those lights failed due to something other than static electricity.

I was walking past a row of moon lights (garden li...

2009-07-23T03:09:44.379+01:00

I was walking past a row of moon lights (garden lights) and each one i walked past the bulb would blow up and sparks would fly from it, is there a level that this would stop at or is this a short term thing or is it permanent??

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2009-07-16T09:29:20.039+01:00

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hi, this situation is getting rediculas. My car, m...

2009-06-03T17:42:29.458+01:00

hi, this situation is getting rediculas. My car, money, dogs fur, our new metal gates , and sometimes brushing past another person, gives me static shocks. Something has to be done....

Great to read why there's static build-up (I thoug...

2009-04-09T02:28:00.000+01:00

Great to read why there's static build-up (I thought it was the nylon carpet) but any solutions? I'm a support worker and I dread going to one particular client whose vac cleaner "attacks" me the whole time I use it. It's making me paranoid! aaahhhhgggg

Great info! Thanks!

2009-04-07T22:12:00.000+01:00

Great info! Thanks!

(Posted by Static Doctor on behalf of Michel Duban...

2009-03-09T17:45:00.000Z

(Posted by Static Doctor on behalf of Michel Duban)

I see an other advantage to use ESD gloves :
The ESD gloves introduice an equivalent to a resistor between ESD sensitive components (ESDS) and your Hand.

If your connection to ground is not perfect, or your flooring system is not good or if the ESDS is charged, the resistance of gloves increase the decay time. Gloves limit the power dissipate in the components. So the components protection is better.
W = P * t or U * I * t
P = W / t

If t increases, P decreases

W is energy stored before ESD on people or on components..
P is the power dissipated during discharge.
t is decay time.

If your ESD prevention Program specifies that they...

2009-03-09T17:39:00.000Z

If your ESD prevention Program specifies that they need to wear grounders, then they need to.

In current standards IEC 61340-5-1:2007 and ESD S20:20:2007 personnel must be grounded if they are handling ESD susceptible parts. If they do not, then you are free to write in your ESD control program that they do not have to wear foot grounders or any other grounding devices. However You might consider whether it is wise to do so as it may cause considerable confusion if some people are allowed into the EPA not wearing grounders, and others are not. Also, can you guarantee that a person entering the EPA who is not wearing grounders, will never be tempted to (or without thinking about it) handle ESD sensitive parts? Specifying that everyone must wear grounders removes these confusions and risks.

In our electronics instrumentation manufacturing f...

2009-03-03T22:00:00.000Z

In our electronics instrumentation manufacturing facility, we require all of our operators that work full-time IN the manufacturing area to wear foot grounders while there.

A frequent comment by many in our facility is that, although they enter an EPA, they do not touch ESDS components.

Is it necessary for all personnel who enter an EPA to wear foot grounders?

Probably the shocks are due to high levels of stat...

2009-02-13T14:42:00.000Z

Probably the shocks are due to high levels of static charge built up on the chute. There are other possible mechanisms and factors though.

Grounding the HDPE will not drain the static away, as HDPE is an insulating material which does not encourage charge to move around.

Hi there, I work in an industrial environment and ...

2009-02-03T20:46:00.001Z

Hi there, I work in an industrial environment and I have a bagger that has a chute made out of HDPE. We need to take chute down a lot for cleaning purposes ( food manufacturing), Our operators have been getting (static shocked) zapped by the chute ( while taking it down or when it is actually on the a cart). We have put a ground strap on the chute, it’s not really helping. Do you have an idea on what we could do to prevent this?

Thanks, I appreciate your help in advance.

Yes, I am a Doctor of Engineering. My first Degree...

2009-01-19T10:00:00.000Z

Yes, I am a Doctor of Engineering. My first Degree was in Electronics and I worked as an electronics designer for some time, before doing a PhD in studies of ignition of sensitive materials by electrostatic discharges (ESD). (See my bio)

Just as water tries to find its own level, static electricity tries to move to neutralise its peaks and troughs (positive and negative high voltages) and return to earth potential. It can only do that if it can move - conductive materials allow the charges to move, and insulating materials prevent the charges from moving. So conductive materials tend to discourage build-up of static electricity and insulating materials (like plastics) encourage build-up of static electricity.

Thank you Doctor. Are you truly like a Doctor with...

2009-01-19T05:33:00.000Z

Thank you Doctor. Are you truly like a Doctor with a degree in Physics and Electricity or is it just...how did you know this??
I would have thought that, using your own argument, since water conducts electrity very well, then a higher humidity would cause a higher conductivity because there's more water particles, thus more electricity would be conducted...I had the concept all backwards.

To understand why static electricity is encouraged...

2009-01-07T15:34:00.000Z

To understand why static electricity is encouraged by low humidity, we need to understand that water conducts electricity very well. If the humidity is above about 30%, many materials will either have absorbed some moisture, or will have a very thin surface layer of moisture. The thickness of this layer increases with the amount of moisture present, and at low humidity is nearly absent. his moisture layer tends to conduct away static electricity as it is generated. So if the moisture layer is absent, static electricity is more free to build up.

I have heard several reports that itchy spots like...

2009-01-07T15:29:00.000Z

I have heard several reports that itchy spots like insect bites can be related to static electricity, but I have never seen such a case myself. It's likely that the static and the itchyness could be related to dry air conditions also. If you have some way of increasing humidity, try this. Having house plants can help.
Static levels are also usually caused by the floor covering material, so you could try using a rug or other floor cover of different material.

I have been in England for over a year but this is...

2008-12-03T10:50:00.000Z

I have been in England for over a year but this is the first time in my life I have experienced an increase in static electricity in/on my body and also itchiness and spots that look like insect bites. Is there anything I can do to stop or lessen this.

Good post.

2008-11-11T08:32:00.000Z

Good post.

Few months ago, I found a document, D1348, on JPL ...

2008-11-01T15:41:00.000Z

Few months ago, I found a document, D1348, on JPL Internet site.
This document gives the ESD rules for protection of components with a sensitivity of 20 Volts.
As the components become more and more sensitive this document should be very interesting.

Morning,I confirm my first comments on cloths use,...

2008-09-07T08:38:00.000+01:00

Morning,

I confirm my first comments on cloths use, and I agree with Jeremy for the necessity to be conform to ESD normalisation documents (S 2020 and or 61 340 -...) .
But If you have very sensitive or ESD susceptible components you must improve the protection.

There are many informations on Internet on class 0 components protection.
But the best document is on JPL Intenet site for components with only 20 V of ESD sensitivity.
Document reference is D 1348.

Best regards.

Michel DUBAN

I find that the ESD bags are the best and easiest ...

2008-05-14T18:40:00.000+01:00

I find that the ESD bags are the best and easiest way to transport sensitive electronics. Sometimes I forget to use one or think I don't need it, but for the small cost, really no one should be without ESD protection. Great article!

Possibly the most important ESD measure in manual ...

2008-03-25T18:10:00.000Z

Possibly the most important ESD measure in manual handling is to ground all personnel to achieve less than 35 M ohm resistance from their body to ground. You can do this for standing personnel, by using ESD flooring with ESD footwear. In this case the resistance of the flooring may have to be around 35Mohm or less as well as the footwear.

When personnel are seated, you cannot reliably ground them by footwear and flooring as they will probably take their feet off the floor. In this case they need to be grounded via a wrist strap.

After these important ESD precautions, ESD coats may be used to reduce ESD risk due to fields from charged clothing.

Dear Sir,We are in the manufacturing unit of tele...

2008-03-19T03:43:00.000Z

Dear Sir,

We are in the manufacturing unit of telecom products,where we require the ESD Protection.
One thing i want to know that,
we are going to make the conductive flooring in our production unit, with proper grounding .Even after the conductive flooring do we require to wear the ESD cloths and Wrist band.How much it is necessory?
reply soon.

Regards

Sandip Thakor
sandip.thakore@matrixtelesol.com
s_thakor@yahoo.com
India.

can't stand this static, not being able to even op...

2008-02-12T14:41:00.000Z

can't stand this static, not being able to even open a door with a brass handle, and every door in my house has one, have to use my elbows can be difficult. Jennie

This doesn't completely answer the question. What...

2008-01-24T17:14:00.000Z

This doesn't completely answer the question. What is the relationship between humidity and static electricity?

S. Mallory
Auburn, WA

The static is building up on your clothing because...

2007-11-27T16:46:00.000Z

The static is building up on your clothing because it is an insulating material - in simple terms a material which does not allow charge to move. Similarly when you touch the material to a metal it does not discharge - because it does not allow the charge to move.
You can treat the material with an antistatic spray which may help. Sometimes washing the clothing with a conditioner can help