I am looking for an adhesive with the following properties:

        1. Capable of bonding kovar to sapphire.
        2. Hermetic seal. 
        3. Thermal coefficient of expansion (TCE) of approximately 5.66
x 10^-6 in/in /°C 
            (0 to 100 °C range).    
        4. Translucent.
        5. Fast curing, with no outgassing.

        I need to bond two sapphire windows to each side of a 2.5" kovar
wheel. 
        The kovar wheel has two gas filled chambers. One chamber is
filled with carbon monoxide and the other with
        nitrogen.

        Since sapphire and kovar have similar thermal expansion
coefficients (between 3.24 - 5.66 x 10^-6 in/in/°C), 
        it would be ideal if the adhesive also had a low thermal
coefficient of expansion.

        The completed wheel assembly will be rotated at  1800 rpm under
very little vibration. 

        Below is a drawing of what I would like to build. Thank you in
advance for your consideration.
 
        Ron Hom
        Advanced Pollution Instrumentation, Inc.
        6565 Nancy Ridge Dr.
        San Diego, CA  92121-2251 

        tel: (619) 642-7766
        fax: (619) 657-9819
        email: [log in to unmask]

################################################################
DesignerCouncil E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c
################################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body:
To subscribe:   SUBSCRIBE DesignerCouncil <your full name>
To unsubscribe:   SIGNOFF DesignerCouncil 
################################################################
Please visit IPC web site (http://jefry.ipc.org/forum.htm) for additional information.
For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311
################################################################