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] * ***************************************************************************