| 摘要 |
<p>Federal Specification DD-G-1403B requires heat-strengthened glass to have a surface compression stress not less than 3500 pounds per square inch nor greater than 10,000 pounds per square inch and an edge compression stress that is not less than 5500 pounds per square inch. Large windows conforming to this specification are believed to have little likelihood to develop dangerous islands of glass that separate from the glass sheets when they fracture. The present invention provides method and apparatus to develop heat-strengthened glass sheets of large dimensions such as used for commercial construction that develop suitable break patterns when fractured.</p> |
