OK - there is a subtle difference between a UV curable and a coating that employs a UV tracer to aid inspection.
The inspection aid is the same as the "blue whitener" used in your laundry to "make white's whiter!" it does degrade with exposure to light - that's why it's regarded as an inspection aid at the time of assembly - not when the war is over!
UV curing lamps will certainly impair reflective performance....read into that what you will!
Graham N
On 17 Jun 2011, at 16:20, Douglas Pauls wrote:
> Joyce,
> In addition to the excellent information that Phil offers, I have seen
> high levels of heat degrade UV fluorescence (above 100C). I have also
> seen assemblies come back to our service centers after being in the field
> for 20-30 years and the fluorescence is often dramatically less, or even
> gone completely. They do degrade with time.
>
> Doug Pauls
>
>
>
> Phil Kinner <[log in to unmask]>
> Sent by: TechNet <[log in to unmask]>
> 06/17/2011 05:21 AM
> Please respond to
> TechNet E-Mail Forum <[log in to unmask]>; Please respond to
> Phil Kinner <[log in to unmask]>
>
>
> To
> <[log in to unmask]>
> cc
>
> Subject
> Re: [TN] NTC Friday Element Quiz - the Question
>
>
>
>
>
>
> Joyce,
>
> The degree of quenching of fluorescent tracer during UV cure depends
> primarily on 2 factors. 1. The wavelength and intensity of UV radiation
> and 2. The degree of loading of UV tracer in the formulation.
>
> The UV tracer is one of the more expensive ingredients in the formulation
> and so its use is typically kept to the lowest dose that will give
> 'acceptable' fluorescence for inspection purposes... the definition of
> 'acceptable' varies between material manufacturers and not all UV coatings
> are equal in this regard.
>
> Most of the common UV tracers have absorbtion peaks in the 360-400nm
> range. Formulations prepared with initiation packages that are active in
> this range will suffer from quenching more than those with initiation
> packages primarily formulated in the 250-300nm range.
>
> Mercury doped lamps (Fusion 'H' or 'H+' style) produce most of their
> intensity in the 250-350 nm ranges and so typically 'quench' the UV tracer
> less than a "D' style lamp which has a significant output of intensity at
> these longer wavelengths.
>
> My advice, look for materials formulated with more UV tracer and
> initiation packages designed to activate at lower wavelengths, with lower
> required overall dose (combination of intensity and time) and you should
> be able to find materials that fluoresce very strongly post-cure - at
> least as well as conventional coating materials. Also, avoid multiple
> cure exposures wherever possible, for a whole number of reasons.
>
> Hope this helps,
>
> Phil.
>
> Phil Kinner
> PVA European Sales Manager
> +44 07703 795422
> [log in to unmask]
>
> "Where precision drives production".
>
> On 17 Jun 2011, at 01:55, Joyce Koo wrote:
>
>> But Ha, you guys don't know what you missing: Doug Pauls conformal coat
> webinar just finished today! Definitely increased few notch on the
> coating IQ. Now: what is the element causes coating FL? My Friday
> Questions: If you use UV coating, some curing condition will quench the
> FL. How do you prevent that?
>> --------------------------
>> Sent using BlackBerry
>>
>>
>> ----- Original Message -----
>> From: Joyce Koo [mailto:[log in to unmask]]
>> Sent: Thursday, June 16, 2011 08:49 PM
>> To: [log in to unmask] <[log in to unmask]>
>> Subject: Re: [TN] NTC Friday Element Quiz - the Question
>>
>> Wow, you smarties. I am sure feel like dummynium.
>> --------------------------
>> Sent using BlackBerry
>>
>>
>> ----- Original Message -----
>> From: Steven Creswick [mailto:[log in to unmask]]
>> Sent: Thursday, June 16, 2011 08:40 PM
>> To: [log in to unmask] <[log in to unmask]>
>> Subject: Re: [TN] NTC Friday Element Quiz - the Question
>>
>> Dave,
>>
>> I believe the element you are quizzing us on is ruba-dub-Dubnium, but it
>> seems to have progressed through the names Dubnium 1968, Neilsbohrium
> 1970,
>> Hahnium 1970, Joliotium (recommended) 1994, and finally back to Dubnium
> in
>> 1997.
>>
>> Boy these guys need to get a life...
>>
>>
>>
>> Element 105 - Dubnium was synthesized by a Soviet team in 1968
>> was re-synthesized by the same Soviet team in 1970, and called
> Neilsbohrium
>> Element 105 - Hahnium was synthesized by A US team in 1970
>> The name Joliotium was recommended in 1994
>> The name Dubnium was finally accepted in 1997
>>
>>
>>
>> Steve Creswick
>> http://www.linkedin.com/in/stevencreswick
>> 616 834 1883
>>
>>
>>
>> -----Original Message-----
>> From: TechNet [mailto:[log in to unmask]] On Behalf Of David D. Hillman
>> Sent: Thursday, June 16, 2011 5:43 PM
>> To: [log in to unmask]
>> Subject: [TN] NTC Friday Element Quiz - the Question
>>
>> Hi folks - Here is the Friday Element Quiz Question (this one may take
>> some sleuthing so the quiz is going out early):
>>
>> The Question:
>>
>> This element has a very contentious history pertaining to who actually
>> first discovered it. This element has been produced by bombarding
>> americium-243 with neon-22 atoms and bombarding californium-249 with
>> nitrogen-15 atoms. The element was "finally" named in 1997. The longest
>> lived isotope of this element has a half life of 34 seconds.
>>
>> Bonus Question: List the two names that were used for this element prior
>
>> to 1997.
>>
>>
>> The quiz winner will get the services of Clumpy and Kloumpios for the
>> week.
>>
>> So far Clumpy and Kloumpios have:
>>
>> Week 1 Lamar Young, SCS Coatings
>> - accomplished nothing (drank lots of coffee)
>>
>> Week 2 Bev Christian, RIM
>> - conducted REACH material testing
>>
>> Week 3 Drew Meyer, Benchmark Electronics Inc.
>> - Solderability testing and mowed the lawn
>>
>> Week 4 Ian Fox, Goodrich
>> - had an epic journey of travel
>>
>> Week 4 Gary Ferrari, Garrick Global
>> - unknown
>>
>> Week 5 Fredrick Miller, Astrolab
>> - unknown
>>
>> Week 6 David Nelson, Raytheon
>> - Were tackling dummys for Dallas Cowboys
>>
>> Week 7 Graham Collins, L3 Communications
>> - Cleaned gutters and painted window trim
>>
>> Week 8 Bill Noel, ITT Geospatial Systems Division
>> - unknown
>>
>> Week 9 Steve Gregory of RD Circuits
>> - unknown
>>
>> Week 10 David Bealer of Watchfire Signs
>> - descaled the in-line wash machine! Ouch!
>>
>> Week 11 Dick Krug of Sparton Corporation
>> - assisted with AS9100 quality management systems requirements audit
>>
>> Week 12 Steve Creswick of Balanced Enterprise Solutions
>> - Acted as Steve's "go fer" due to a broken leg!
>>
>> Week 13 Gebhard Neifer, Delphi
>> - conducted a plasma pre treatment Taguchi DOE for a sealing process
>>
>> Week 14 Bev Christian, RIM
>> - assisted with a tin pest investigation/test
>>
>> Week 15 Bev Christian, RIM
>> - assisted Bev shoveling snow
>>
>> Week 16 David Bealer of Waatchfire Signs
>> - assisted with reflow profiling
>>
>> Week 17 Brian Ellis, rumored to be retired
>> - assisted with rewiring the house, had a tractor accident and found
>> his cousin Kloumpios
>>
>> Week 18 Denny Fritz, SAIC
>> - assisted with tin whisker inspection/examinations
>>
>> Week 19 Graham Collins, L3 Communications
>> - assisted with scraping barnacles, boat paint and boat engine
>> maintenance
>>
>> Week 20 Mark Woolley, PTRL Laboratory Avaya
>> - assisted with weather observations (70F to snow) and resolving
>> electrochemical migration failures
>>
>> Week 20 Tom Carroll, Boeing Defense, Space and Security
>> - assisted with commercial aircraft galley inspection
>>
>> Week 21 Brian Ellis, supposedly retired, and Tom Carroll, Boeing
> Defense,
>> Space and Security
>> - assisted with root cause corrective action tasks
>> - assisted with nothing but catching up with the family
>>
>> Week 22 Drew Meyer, Benchmark Electronics Inc.
>> - assisted with metallographic cross-sections and Dye & Pry testing
>>
>> Week 23 Bev Christian, RIM
>> - assisted with a creep corrosion project and the setting up of an
> oxygen
>> bomb
>>
>> Week 24 Steve Gregory, RD Circuits
>> - assisted with ?????
>>
>> Everyone have a great weekend.
>>
>> Dave Hillman
>> Rockwell Collins
>> [log in to unmask]
>>
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