New Type Of Glass Resists Small Explosions

Date: 17 September 2009
Scientists have created a new type of blast-resistant glass that is thinner, lighter and less vulnerable to small-scale explosions than existing glass.  In tests, the improved glass design has been shown to withstand a hand grenade-strength bomb explosion originating close to the window panel.

The blast caused the glass panel to crack, but didn’t puncture the composite layer.
Blast-resistant glass windows are often installed in federal buildings and other vulnerable structures as a safety measure against potential terrorist attacks. However, they are thick and expensive to manufacture.
“The glass we are developing is less than one-half of an inch thick. Because the glass panel will be thinner, it will use less material and be cheaper than what is currently being used.” said Sanjeev Khanna, a professor of mechanical and aerospace engineering at Missouri University.
Conventional blast-resistant glass is comprised of a layer of strong plastic sandwiched between two sheets of laminated glass. The new design is built stronger and thinner by replacing the plastic layer with a transparent composite material made of glass fibers embedded in plastic. The glass fibers are only about half the thickness of a typical human hair (25 microns), and leave less room for defects in the glass that could lead to cracking.
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600450 New Type Of Glass Resists Small Explosions
Date: 17 September 2009

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