Rub it with itself, what else? Duhh.
How would you propose to do this?
Fold it over, or cut it in half and pretend you're a cricket
during mating season? I hardly think that's a realistic
scenario unless someone is trying to do it.
Oh yeah, you don't about
ESD damage. experiment 101, get a ESD Static filed meter. Rub
plastic together and bring it 1" from ESD meter, reading will
be above 6,000 maybe to 15,000 volts. Simple triboelectric
charging experiment. Look up Triboelectric charging.
So what's the point exactly?
Ok, let's play Devil's advocate- It is a bad idea to take
multiple pieces of plastic, rub them together trying to
create an ES charge then try to discharge it through the
hard drive PCB. With that out of the way, like I already
wrote manufacturers use plastic sheeting all the time for
insulation and not ESD preventative types, just plain old
plastic.
This arbitrary problem is a present day industry wide problem!
ESD is, yes, but trying hard to create some hypothetical
scenario is a pointless exercise, since we can do same with
practically any event, even walking across carpeting. Do
you propose we float above the floor from now on too?
The answer is simple, the chassis is grounded, installer is
discharged and mindful of what's being done... as is always
the scenario. If you're really worried about this then I
hope you have no plastics in your case else you can never
work on a computer again.
You don't know about triboelectric charging. You take a
piece of plastic, your touching it, rubbing it, handling it,
charging it up. Do the same with a ESD mylar bag or pink poly
bag and you get no charge. which means you don't know how to
make a charge or prevent charging up of materials.
Yes, it's possible to create a charge. It's possible to
create a charge without any plastic, too, and plastic
sheeting IS used for insulation, not ESD rated plastic just
plain old untreated sheeting. I don't suppose I need
mention that the products using them, work.
Wrong. Electrical uses plastics, electrical not damaged by
voltages about 1000 volts. You have to look at ESD ratings.
You don't know about ESD. hoo humm,
You are being ridiculously oversimplistic. Some vague
concept about ESD, has to be applied to the actual scenario.
Yes, ESD exists, and there has to be a mechanism to cause,
and discharge, for there to be a problem. Likewise when
working with any computer components.
DOD-STD-1686 ESD/EOS 5.1 VOLTAGE RANGE
Equivalent
CLASS 1 CLASS 0 0 to <= 249
CLASS 1 CLASS 1A 250 to <= 499
CLASS 1 CLASS 1B 500 to <= 999
CLASS 1 CLASS 1C 1000 to <= 1,999
CLASS 2 CLASS 2 2000 to <= 3,999
CLASS 2 CLASS 3A 4000 to <= 7,999
CLASS 3 CLASS 3B >= 8000
Gee I guess you really are stupid. Hum. Let's see, buy a
hard drive and it comes in a ESD bag.
I do hope you eventually take it OUT of that bag to use it!
Buy an computer
part and it comes in a ESD bag.
.... and likewise, the part is removed from the bag to be
installed, the bag is not strapped to the part in the
system.
Humm, I just bought 100
diodes and they're shipped in an ESD bag. Humm why is that.
I hope you someday see beyond your oversimplified view.
This is done so that the parts are protected UNTIL they're
readied for use, and similarly so with the hard drive, it
should remain in it's ESD bag until installed... at which
point it is REMOVED from such bag,
Buy a motherboard and it comes in a ESD bag. humm?
Who the hell would by a Athlon AMD3200 in a zip lock bag.
Dooo! whta a dumb ass thing to do.
Do go ahead and skip right to the logically fallacy you
consider to be your point. Nobody ever claimed ESD doesn't
exist. Now fast-forward from protective packaging to actual
part usage.
Buy a cap, resistor, transformer, how the hell can a
passive part be damaged by any voltage that will ESD
zap an 'ELECTRONIC' component? A component made with
silicon; TTL IC, CMOS IC, diodes 1n4001 sold by any
diode mfg. is shipped in an ESD bag, becasue it can
zap by a ESD discharge. ho humm,
I don't know how to break this to you, but this is not news
to me, it's not advancement of your argument but a
side-track from the central issue. I encourage you to open
your system and count all the semiconductors still wrapped
in anti-static baggies.
Wrong. MIL spec PCBs boards are dipped in conformal coat.
No, the conformal coating is NOT anti-abrasive, it is a
sealing agent only, not a mechanical insulator.. It is not
used in place of plastic sheeting. You haven't a clue.
Conformal coated boards are then assembled in said chassis.
Yes, on standoffs, plastic sheeting, or other methods which
isolate the board. The conformal coating is never called
upon to take this role.
That typically means screwed down with metal hardware (not
really, stand offs ?), conformal PCBs slid into card slots,
card guides. This is mechanical contact that need insulation,
don't want to short out a PCB now. You don't know, not
enough experience.
It's sad when someone like yourself gets so far away from
reality that they'll never be able to relearn things
correctly. NO, there is no properly engineered card where a
conformal coating is called upon to insulate a card from a
card guide. The card has the allowance for this contact
region, engineered onto it, either an isolated region or a
ground. I hope you never actually have to depend on this
illusions you've suggested, nor that anyone else ever does.
Conformal coat spray comes in mainly 3 different ratings,
silicone (gc chemicals makes this spray) and gives up
to 10,000 volts of barrier protection at 5 to 10 mils.
Heavy duty silicone conformal spray, gives bigger voltage
barrier. And then the bad cancer causing stuff used for
MIL boards, which no can buy anyway.
Sure, it can and does insulate. That doesn't mean it also
has the other properties necessary for mechanical fitness
like abrasion resistance. I suggest that you stop guessing
and take a good hard look at some (any) electronics
products, as I"d love to hear of any that are using
conformal coating as an insulator against a mechanical
contact between conductive metals.
I doubt that the assembly of a HD in a chassis is going to
experience over 10,000 volts or static zap. So Silicone
conformal coat spray is a suitable viable option.
But if you've never done before this, forget.
I recommend that anyone reading this, completely ignore you.
There is no need to start spraying conformal coating on
anything, it'll just make a mess and there is still a more
robust insulator needed, IF there are actually any potential
points of electrical contact between the laptop bay and the
drive PCB.
Wrong, uhh, Fish paper has a MSDS and you can buy fish paper
in different voltage levels, ex. 10,000 volts is common form
any electronic surplus store. You can buy fish paper for higher
rated voltages. And this higher rated stuff is for 'Electrical'
insulation, not electronic. I've seen up to 60,000 volt break
down fish paper, so says the mfg MSDS, don't you know?
One would hope that after you're done with all this
babbling, you manage to pay attention to what you're doing
instead of rubbing sheets of plastic together trying to
create ESD, and thus, you won't have 60,000 volts to worry
about. Ever heard of "Fire Marshall Bill"?
Paper or cardboard is not a a suitable material because it
can not provide any barrier against voltage, it is not an
insulator. white paper or cardboard out gasses chlorine
causing corrosion but what do you know? so far not much.
Actually just about any kind of paper or cardboard suitable
thick would work. This is a one-shot installation of a
part, and like all the other parts scenarios you foolishly
overlook, it does not need continual protection against
60,000 voltage, only to be installed in a ESD safe
environment and be an effective insulator against 5V, but as
importantly, be mechanically sound from an abrasion and
puncture standpoint if the drive is putting pressure on it.
It's somewhat amazing that you take such pains to make even
simple things, as difficult as possible. Perhaps you should
just focus on same things the entire industry does, that the
key is proper handling form the time the part is removed
from the bag, until installed in the equipment. Unless
you're a tool that's going to be continually shuffling
around on your carpeting then trying to discharge your
finger on the back of the hard drive circuit board, you do
not have a need to continually protect against very high
voltage. In other words Fire Marshall Bill, I'm sure if you
try hard enough you can manage to damage something- now
might I suggest you just blindly follow industry standard
procedures which are demonstrated to work, instead?
Typical tech spew. You have to think about the problem and
find the correct solution.
Then why have you drifted off on a tangent instead?
Not act, like a typical garage
tech junkie. Junk makes junk.
I look forward to seeing pictures of your entire system
dismantled so you can spray conformal coating over
everything before placing each piece back in anti-static
bags. That's the easy part- I want to see how you'll use
the system like that.
