Hi Steve

My apologies for this tardy reply - just bought another business which  
kept me rather busy.

In answer to your question, take care.

UV curables offer superb fast cure in seconds - on 2D objects. The  
tough part is getting the coating to cure where the light doesn't  
shine, and it is really tough to bend light!

All UV's need to use a secondary cure mechanism to facilitate curing  
in shadow areas. Often this is a moisture cure, but often it fails to  
cure off for anything up to 7 days. Furthermore the product is  
ionically "active" until it has cured.

Most of these issues have been addressed in UV40, but how fast you can  
put the end product in a box to ship is something you should check for  
yourself. The last thing you need is for the coating to flow out from  
underneath components whilst in transit.

A comment if I may: Changing the coating to get the product out of the  
door is not the sort of design brief I would feel comfortable with. A  
full product re-qualification would be required.

Back to the coating you do use: Most urethanes are moisture cure  
unless you are working with 1A33? If it is 1A33, then you should be  
able to ship sooner than 20 hours.

I would prefer to see the following terms used:

Tack-Free
Dry
Fully cured

You can get most urethane coatings Dry - no flow-out during transit -  
within around 8 hours or less.

Let me know which coating you use and I might be able to suggest an  
alternative schedule.

Graham

Gen3 Systems
www.gen3systems.com - Engineering Reliability in Electronics

On 25 Jan 2008, at 18:39, Steve Gregory wrote:

> Hi Graham!
>
> It's funny that this thread should come up now. We just realized that
> the urethane coating we use requires at least a 20-hour cure, and
> everybody went into a tizzy about our ship schedule.
>
> I was then asked if I knew anything about UV cure coatings, which I
> don't. So my first question is; how long does it need to cure before
> it's ready to ship? I understand that it might not be fully cured and
> ready for full service, but rarely, if ever, do we ship something to  
> our
> customer that will get put into full service as soon as the they  
> receive
> it.
>
> Also, what kind of UV source, or oven would you recommend?
>
> Thanks!
>
> Steve Gregory
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Graham Naisbitt
> Sent: Friday, January 25, 2008 11:55 AM
> To: [log in to unmask]
> Subject: Re: [TN] Humiseal UV40 Conformal Coating
>
> Amol
>
> It is indeed a new coating, and a good one. There are several users in
> Europe who, not speaking English, don't see the Technet. What do you
> need to know and I will see if I can help
>
> Kindest regards
>
> Graham Naisbitt
>
> Work:  [log in to unmask]
> Home: [log in to unmask]
>
>
>
>
> On 23 Jan 2008, at 12:41, Kane, Amol (349) wrote:
>
>> Dear TechNetters,
>> Does anybody have any Experience (good or bad) with Humiseal's UV40
>> Conformal Coating?......we will need to use it on some of our boards
>> soon and just wanted to test the waters to see if anybody else is
>> already using it.
>>
>> We already do UV cure coatings and have the necessary setup.
>>
>> Thanks in advance,
>> Amol
>>
>>
>>
>>
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