Glass Specifications - Toughened Safety Glass, Notches & Special Cases

 

Notches

When the outer edges of the accessory are aligned with the edges of the glass, the clearance between the inner part of the accessory and the glass must always be between 4mm (maximum) and 1mm (minimum).

• Rules for position of notches (see fig. 5)
  Y1 < X1 and Y1 < X2 : the height of a notch must not exceed its width.
  b > X1/2 : the distance between two notches must be at least half the width of the largest notch.
  a > X1/2 and a > 100mm : the distance between the notch and the edge of the glass must be at least half the width of the notch, and this distance must be greater than 100mm (see fig. 6).
  R > t : the radius of the notch must be at least equal to the thickness of the glass.
• Rules for position of angled notches (see fig. 7)
  X < B/3 and X < 200mm
  Y < H/3 and Y < 200mm
  The width of the notch must not exceed 1/3 the width of the sheet of glass. For flat toughening, the width or height of the notch must not exceed 200mm.
• Tolerances on notch position Tolerance on positioning: ± 2mm

Special Cases

• Trapezoidal sheets
  Do not exceed the length/width ratio < 8 where width =
  and B must be at least 250mm
• Acute angle sheets
  The same rules as for trapezoidal sheets apply. Section B (below) cannot be notched, sometimes known as “shortened corner”, and is measured in the following way (in mm):
  IF 0 = the acute angle, (expressed in degrees)
  0 < 65° : B min = 18 - 0.2 x 0
  0 > 65° : B > 5mm
  The guidance given above is indicative and final manufacturing confirmation should be sought from the supplying branch.