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Old 19th December 2009, 12:10 PM   #201
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"The layer I did without diluting has 1E10"

That seems to be way to high for an undiluted polish, probably due to the
fact that all polishes are certainly not "topical".

You must get the right stuff, Pro-stat or 1720.

I have some small amount of Prostat left, give me our adress so I can send a small bottle to you for free.

And do not worry about the layer thickness when it comes to the recommended floor polishes, instead worry to make sure it stays on the membrane for a few years.....

Regards, Jonas
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Old 19th December 2009, 03:03 PM   #202
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Quote:
Originally Posted by JonasKarud View Post
"The layer I did without diluting has 1E10"

That seems to be way to high for an undiluted polish, probably due to the
fact that all polishes are certainly not "topical".

You must get the right stuff, Pro-stat or 1720.

I have some small amount of Prostat left, give me our adress so I can send a small bottle to you for free.

And do not worry about the layer thickness when it comes to the recommended floor polishes, instead worry to make sure it stays on the membrane for a few years.....

Regards, Jonas
Dear Jonas
What's odd: Specified resistance is 1e6-1e7/sq
What specified wet layer thickness/application procedure would be? - the reply to the explicit inquiry says: use the brush or sprayer
I did put some of the coating on test piece (10x12cm, 1cm graphite contact strips) and spreaded with non-woven cloth. It was then dried by the specs.
Again, the coating is for INDUSTRIAL use and has to withstand common cleaners, mild solvents, scratching, bending etc.
BTW Pro-stat equivalent is on avail - next thing to test
P.S.Thanks for generous offer, please do not send anything - I'll figure it out

Last edited by alexberg; 19th December 2009 at 03:10 PM.
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Old 21st December 2009, 08:02 AM   #203
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You must get the right stuff, Pro-stat or 1720.

Regards, Jonas

Am I not getting something or what?
Below are the quotes
"1720-G 1 gallon in plastic jug (coats @1,200 ft2)"
"Deionized Water………………………………. (7732-18-5) 75-85%"
the rest is solid residual
1 gallon is 3.8 L, 1200 ft 2 is 120 m2, 1 L is 0.001 m^3
1/4 of a gallon is approx 1 L
If one spreads 1 L of something over the 120 sq m the result has to be
0.001/120=8.3e-6 m=8.3 micron. which is as thick as film itself
And this is the right staff?
Alex

Last edited by alexberg; 21st December 2009 at 08:17 AM.
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Old 21st December 2009, 12:04 PM   #204
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Hi Alexberg

Better use your own prostate for the right stuff, will probably do 10 exp9 ohm as well.
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Last edited by MJ Dijkstra; 21st December 2009 at 12:10 PM.
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Old 21st December 2009, 02:33 PM   #205
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Quote:
Originally Posted by MJ Dijkstra View Post
Hi Alexberg

Better use your own prostate for the right stuff, will probably do 10 exp9 ohm as well.
Now I understand why ESL are that expensive...

Why would one see an offense where there is no one...

10^10 coating is less than micron thick

Alex
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Old 21st December 2009, 03:06 PM   #206
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No offense here!
Just a joke (on the edge, I agree, but the word Pro-stat couldn't resist me)
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Old 21st December 2009, 04:59 PM   #207
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Alexberg, Your calculation is elegant and correct, but when I measure the weight of a square meter membrane with dried ProStat coating, the figures shows a low 15-20% increase in weight.
This, I think, must mean about the same in increased thickness, from 6uM to 7.2 uM. If you have the time, try to measure the weight increase with your coating.

After all, it's not the added thickness that is important, it's the added weight!

If you use a big piece of membrane, you can see the difference on a simple pocket letter scale.

Prostat is a very silly name , no wonder it went out of production.....
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Old 21st December 2009, 05:11 PM   #208
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By the way , some interesting stuff here:

Electrostatic Loudspeaker Systems ... - Google Patent Search

Paragraph 59 and 60 describes a printed coating...
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Old 22nd December 2009, 11:37 AM   #209
EdwinR3 is offline EdwinR3  Belgium
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Alexberg,

"If one spreads 1 L of something over the 120 sq m the result has to be
0.001/120=8.3e-6 m=8.3 micron. which is as thick as film itself
And this is the right staff?"


in your calculation of layerthickness, you should
account for the part that dissapears by drying.
Since the product contains 75-85 % water, the residue of
dry film will by max 25% of the calculated 8.3΅.

I think the dry film will be around 1.5 to 2 ΅.

Edwin
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Old 22nd December 2009, 12:29 PM   #210
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Quote:
Originally Posted by JonasKarud View Post
By the way , some interesting stuff here:

Electrostatic Loudspeaker Systems ... - Google Patent Search

Paragraph 59 and 60 describes a printed coating...
If that is the way Final used it in their products then we should probably be cautious. One of the common problems with their speakers (or so I've heard) was disappearing coating. This may be the reason they mention a conformal coating to protect the conductive layer. This is one of the problems when you try a new coating, how is it going to hold up over time when faced with high voltage?
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