Molybdenum Foil Seal
Another widely used method to seal through glass with low coefficient of thermal expansion is the use of strips of thin molybdenum foil. This can be done with matched coefficients of thermal expansion or unmatched after Housekeeper. Then the edges of the strip also have to be knife sharp. The disadvantage here is that the tip of the edge which is a local point of high tensile stress reaches through the wall of the glass container. This can lead to low gas leakages. In the tube to tube knife edge seal the edge is either outside, inside, or buried into the glass wall.
Read more about this topic: Glass-to-metal Seal
Famous quotes containing the words foil and/or seal:
“You have waited, you always wait, you dumb, beautiful ministers,
We receive you with free sense at last, and are insatiate
hence-forward,
Not you any more shall be able to foil us, or withhold yourselves
from us,
We use you, and do not cast you aside—we plant you permanently within us,
We fathom you not—we love you—there is perfection in you also,
You furnish your parts, toward eternity,
Great or small, you furnish your parts toward the soul.”
—Walt Whitman (1819–1892)
“The denial of our duty to act in this case is a denial of our right to act; and if we have no right to act, then may we well be termed “the white slaves of the North,” for like our brethren in bonds, we must seal our lips in silence and despair.”
—Angelina Grimké (1805–1879)