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| Date: | Thu, 28 Oct 2004 16:25:36 -0700 |
| Content-Type: | text/plain |
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Bogert,
You are quite correct. UR coatings are very difficult to remove once
they have reached a completely cured state.
HumiSeal created a 1 part UR that first "drys" as the solvents evporate
and then cures (cross-links the molecules) by reacting with Oxygen. It
is during the cross-linkage cure cycle that the 1A33 can be removed with
IPA. It simply gets more difficult to remove as the cure progresses
until the IPA won't work any longer (about 3 to 4 weeks at room
temperature).
David a. Douthit
Manager
LoCan LLC
- Bogert wrote:
> Type 1A33 coating is type UR. No type UR is easy to remove. Solvents
> used for removal can cause significant electrical problems if not
> completely removed by the subsequent cleaning process.
>
> ----- Original Message -----
> From: David Douthit <mailto:[log in to unmask]>
> To: [log in to unmask] <mailto:[log in to unmask]>
> Sent: Tuesday, October 26, 2004 7:02 PM
> Subject: Re: [TN] conformal coating
>
> James,
>
> If I'm not mistaken 1A33 is a 1 part urethane coating that requires
> extended curing times (>500 hrs) at room temperature. This coating
> is a
> two stage "cure". The stage is the evaporation of the solvents which
> leaves a "touchable surface that feels dry. The second stage is the
> "cross-linkage" that takes place when oxygen molecules permeate the
> coating. Any attempts to "clean" surfaces coated with 1A33 before
> this "cross-link" curing is complete will result in damage. The major
> selling point for 1A33 is that it is easily removed and replaced for
> repair work for two or three weeks after it is applied.
>
> Because the "cross-link" portion of the cure requires oxygen, heat
> does
> not accelerate the curing process.
>
> Just have them wait 30 days befor cleaning or use a 2 part urethane.
>
> David A. Douthit
> Manager
> LoCan LLC
>
> James TerVeen wrote:
>
> >I am looking for a conformal coating that can withstand the use of a
> >cleaner (Lixton TS-974)
> >We have a customer who uses our parts that are coated with
> Humiseal 1A33
> >and is cleaning them in an ultrasonic cleaner that has Lixton
> TS-974 in it.
> >They are complaining that the coating is coming off. With the
> ingredients
> >I see below there is no wonder. So my first question was, is
> there a
> >conformal coating that will withstand this material or if not is
> there a
> >better cleaner I could recommend that will not remove the humiseal.
> >Remember it has to go into an ultrasonic cleaner.
> >
> >Thank in advance.
> >
> >
> >The ingredients are in this material are:
> >LIXTON
> >
> >50 - 10% 4-Hydroxy-4-methyl-pentan-2-0n
> >2.5 - 10% N-methyl-2-pyrrolidome
> >2.5% Alkylaminethoxylat
> >2.5% modifiziertes Fettalkoholetethoxylat
> >
> >
> >
> >
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