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Lead-free solder glasses with soldering temperature of 450 C were also developed.
The solder glass can be also applied from molten state to the area of the future joint during manufacture of the part.
The solder glass must have a coefficient of thermal expansion which is equal or a little lower than that of the soda-lime glass.
(devitrified solder glass)
VIG units which are currently on the market are hermetically sealed along their perimeter with solder glass, that is, a glass frit having a reduced melting point.
An evacuated glazing unit is made by sealing the edges of two glass sheets, typically by using a solder glass, and evacuating the space inside with a vacuum pump.
When used to solder other glasses, the solder glass needs to be fluid at temperatures (450o - 550oC) well below that at which the glass to be sealed will deform.
Quick Care got its start when Mr. Gray, 38, a jeweler in Westchester Square who soldered glasses on the side, approached Mr. Bonizio about setting up shop together.
• In stained glass work, you could inhale lead fumes when soldering glass pieces together or you could be exposed to lead when handling lead came or leaded solders.
The solution is to cover the copper with a solder glass which has a low melting point and does flow on copper and then to press the soft soda-lime glass onto the copper.
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