Tempered glass can no be cutted and drilled by glass tools, can only be processed to the required shape before tempered. and possibility to explode blew in high temperature changed.
1. Minimum width of glass containing holes that can be satisfactorily tempered is eight times the thickness of the glass.
2. The distance from any edge of glass to nearest point on rim of hole must be at least 1.5 times the thickness of the glass on glass that is 12mm or less in thickness and at least 2 times the thickness of the glass that is over 12mm in thickness.
3. Circular holes must have a diameter at least 1.6mm greater than the thickness of the glass .the maximum size of hole must not be more than one-third the narrow dimensions of the plate. In other circular holes ,any corners must have fillets ,the radius of which must be equal to the thickness of the glass.
4. Holes near corners must be located so that the nearest edge of hole is at least 6.5 times the thickness of the glass from the tip of the corner when the corner is 90o or more.
5. Notches and cutouts must have fillets, the radius of which must be equal to，or greater than，the thickness of the glass.
Point support glass curtain wall should use tempered glass, shall not use ordinary float glass. The center of the glass hole from the edge of the distance should meet the design requirements, and not less than 100mm.
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