P.G. Wilson:

The condition you describe sounds like "devitrification" of the 
quartz which is caused by the quartz coming in contact with a 
halogen (i.e., Chloride, fluoride, or bromide ions) while at 
elevated temperatures.  The quartz hazes over and loses much of 
its transparency.  This white haze is a structural change in the 
quartz which also weakens the quartz and it could shatter.  There 
is sufficient chloride (from perspiration) on a persons hand that 
if they handle a quartz object and do not clean it properly 
before it reaches an elevated temperature devitrification occurs. 
Quartz objects that are to be handled should never be touched 
with bare hands.  Vapors from halogen acids (i.e., HCl,etc.) 
should not be allowed to come in contact with quartz either.  
I know of no way to reverse this reaction.  Again I am not positive 
that this is your problem but it is a good possibility.  If you 
require addition information you can contact me directly.  

Harry O'Halloran


              \\'''''//
               (o   o)
@----oOO---------(_)----------------@
|           Harry O'Halloran        |
|   DSC Communications Corporation  |
|            1000 Coit Road         |
|        Plano, TX 75075-5813       |
|       Phone:  (972) 519-3916      |
|     [log in to unmask]     |
@--------------------------oOO------@
             | __ | __ |
              | |   | |
              ooO   Ooo



______________________________ Reply Separator _________________________________
Subject: GEN: UV Lamps 
Author:  [log in to unmask] at smtplink
Date:    12/17/96 7:14 PM



Technet!

Our quartz cooling jackets for double sided UV curing lamps generate
2000W of energy and much heat.

The quartz jackets become striated and stressed at the fused ends.  Also
material adheres to the inner wall closest to the lamp over time.

1) Does anyone know what this material coating is?  (We use distilled
water in the cooling jacket and two hoses connected inside the unit.)

and  2)  Would a routine annealing remove the material and /=A0or
stress?

Thank yinz ahead of time.

P.G. Wilson
[log in to unmask]

***************************************************************************
* TechNet mail list is provided as a service by IPC using SmartList v3.05 *
***************************************************************************
* To unsubscribe from this list at any time, send a message to:           *
* [log in to unmask] with <subject: unsubscribe> and no text.        *
***************************************************************************
* If you are having a problem with the IPC TechNet forum please contact   *
* Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask]      *
***************************************************************************


***************************************************************************
* TechNet mail list is provided as a service by IPC using SmartList v3.05 *
***************************************************************************
* To unsubscribe from this list at any time, send a message to:           *
* [log in to unmask] with <subject: unsubscribe> and no text.        *
***************************************************************************
* If you are having a problem with the IPC TechNet forum please contact   *
* Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask]      *
***************************************************************************