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Old 10th December 2012, 09:53 PM   #701
sheep is offline sheep  Canada
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Where can we buy phenol?
In a pharmacy, or hardware store?
Is nylon soluable in methanol or ethanol?

Quote:
Originally Posted by oshifis View Post
I am not sure if this has been cited along this thread (sorry if it was):

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Old 10th December 2012, 11:01 PM   #702
Bazukaz is offline Bazukaz  Lithuania
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Hi,

Phenol is not easy to get. Perhaps you could try to get from chemistry labs if you know somebody close to it.
Both nylon 6,6 and nylon 6 should absorb moisture better than elvamide 8061 according to its datasheet.
The old and famous here Calaton was manufactured from nylon 6,6.
Standard nylon 6,6 is used for cable ties. Fishing line is made from perhaps nylon 6 in most cases but I am not certain.
It can also be dissolved in glacial(concentrated) acetic acid or formic acid. Both of these are very irritating but maybe less dangerous than phenol.

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Lukas.
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Old 11th December 2012, 02:52 AM   #703
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Default DO NOT DO IT period

Are we using shellac for wire insulation?

The whole deal with phenol is the solubility of PET in the former, thus adhering polyamide to PET. Alcohol soluble polyamides are well known and easily obtainable, for instance iron-on fabric glue strips. Go buy some and check solubility in alcohol (methanol, ethanol, propanol, all will do). Another substance that does the trick is old mothballs which are even more toxic.

DO NOT DO it, period.

Besides one need to master graphite coating beforehand which is not a spray and forget operation.

Why don not one surface treat PET as it was suggested in this tread multiple times and just ethanol soluble nylon - still PIA to do, BTW.
I've stumbled on use of yet another odd material, capacitor paper, sometimes used by RC guys for their planes, should work, extremely light and thin 1/4 mil easily. Do not need coating... Some speakers are made with paper cones, are not they?
Have fun
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Old 11th December 2012, 03:09 AM   #704
Bazukaz is offline Bazukaz  Lithuania
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Quote:
Originally Posted by alexberg View Post
The whole deal with phenol is the solubility of PET in the former, thus adhering polyamide to PET. Have fun
Have tried with phenol a long time ago. The result wasn't any better than with formic acid : in short , adhesion as poor. It doesn't seem that PET films dissolve in phenol, at least within shot time frame.
Perhaps concentration, application and surface preparation are critical.
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Old 11th December 2012, 04:20 AM   #705
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Quote:
Originally Posted by Bazukaz View Post
Have tried with phenol a long time ago. The result wasn't any better than with formic acid : in short , adhesion as poor. It doesn't seem that PET films dissolve in phenol, at least within shot time frame.
Perhaps concentration, application and surface preparation are critical.
Additive free nylon solution sticks well if baked at neat melting point of PET.
Definitely some trickery is involved: membrane sagged :-(
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Old 11th December 2012, 12:04 PM   #706
Bazukaz is offline Bazukaz  Lithuania
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From my experience If you heat the Mylar too much the tension of the film is lost even more, also tensile strength is compromised. You must be careful with that.
I can say that Elvamide appears to stick to mylar very well if membrane is prior cleaned with acetone. I have tried 5% solution in 95% ethanol/water mixture. Gelling time is just a half an hour or so.
However pure elvamide 8061 did not show any measurable conductive properties so I stopped experimenting with it. The recipe of washing the film with soapy water before can possibly improve this to degree IMO.

Regards,
Lukas.
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Old 11th December 2012, 06:19 PM   #707
AndreaT is offline AndreaT  Italy
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Default I destroyed the mylar taking apart the ML Sequel II panels

Hello Friends, ... yes, I know, it was August when I said you to be going to do that... but I then waited for the Lycron Christal arrived in October.

Well, today I finally decided to start the job taking apart the Martin Logan Sequel II panels.

Unfortunately, even if I tried to do the best possible being very gently, opening the stators the mylar broken (to both panels).

Herein are the pictures of one panel, but the other is the same.

11122012360.jpg11122012362.jpg

Any suggestion about? Can I try to keep it in place with some adjustments or have I to replace it?

In the case of enforced replacement, what shall have I to use? I knew there was some 3um Mylar (probably the thinnest on the market), is it the best?
And how to get instruction on the mylar replacement?

Many thanks in advance!
Regards, Andrea
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Old 11th December 2012, 06:37 PM   #708
tyu is offline tyu  United States
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Thay well still work...i have a old pr sl3 panels... look the same.. thay been working for years... you can just leve them as thay are...are cut what left out of the tar mylar.....clen an put the coaeting on..... an new bias feeds an youll get more out than when thay were new... just put tape on the sides of the panels to hold them togather.. so you can get them back apart ...the wood real will hold the togather... or re-do the panes.....i would pass...

Look how clen the mylar is you must have clen it....you my not even need to re-coat....just run new bias feeds...get alumn type duck tape an cut strips....it works gerate.....good luck

Last edited by tyu; 11th December 2012 at 07:01 PM.
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Old 11th December 2012, 06:44 PM   #709
sheep is offline sheep  Canada
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Is nylon 6,6 or nylon 6 soluble in isopropyl alcohol, antifreeze, or hydrogen peroxide?

Last edited by sheep; 11th December 2012 at 06:57 PM.
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Old 11th December 2012, 09:20 PM   #710
Bazukaz is offline Bazukaz  Lithuania
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Quote:
Originally Posted by sheep View Post
Is nylon 6,6 or nylon 6 soluble in isopropyl alcohol, antifreeze, or hydrogen peroxide?
Interesting table I have found :
[UNITIKA Nylon Resin] Nylon6

Looks like hydrogen peroxide could work.

Regards,
Lukas.
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