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Subject: Re: metal fuseable with Neutral Glass

Date: 09/13/02 at 11:29 AM
Posted by: Donald Mattox
E-mail: donmattox@svc.org
Message Posted:

In Reply to: metal fuseable with Neutral Glass posted by SCIENTIFIC GLASS WORKS on 09/11/02 at 4:59 PM:

For those that are interested in what neutral glass is. I believe that it is a glass formulation where the sample it contains (chemical , biological etc.) is not contaminated by material leaching from the glass. For example pure water will leach silicon and silicates from many glasses - hence the discovery of "poly-water" which was really sodium silicate in water.
I don't know what the composition or coefficient of thermal expansion (CTE) is of neutral glass. Most glass-to-metal seals try to match the CTE of the metal and glass. Thus there are tungsten sealing glass, Kovar sealing glass, molybdenum sealing glass, even aluminum sealing glasses.
An exception is sealing a flat ribbon or thin filament into glass where there is not alot of stress generated because of differences in CTEs. Platinum is a common ribbon sealing metal. You might try sealing Pt ribbon into glass with a press seal. Don Mattox


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