BS EN 14321-1:2005

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Glass products
5 Fracture characteristics
6 Dimensions and tolerances
   6.1 Nominal thickness and thickness tolerances
   6.2 Width and length (sizes)
        6.2.1 General
        6.2.2 Maximum and minimum sizes
        6.2.3 Tolerances and squareness
        6.2.4 Edge deformation produced by vertical toughening
   6.3 Flatness
        6.3.1 General
        6.3.2 Measurement of overall bow
        6.3.3 Measurement of local bow
        6.3.4 Limitation on overall and local bow
7 Edge work, holes, notches and cut-outs
   7.1 Warning
   7.2 Edge working of glass before toughening
   7.3 Profiled edges
   7.4 Round holes
        7.4.1 General
        7.4.2 Diameter of holes
        7.4.3 Limitations on position of holes
        7.4.4 Tolerances on hole diameters
        7.4.5 Tolerances on position of holes
   7.5 Notches and cut-outs
   7.6 Shaped panes
8 Fragmentation test
   8.1 General
   8.2 Dimensions and number of test specimens
   8.3 Test procedure
   8.4 Assessment of fragmentation
   8.5 Minimum values from the particle count
   8.6 Selection of the longest particle
   8.7 Maximum length of longest particle
9 Other physical characteristics
   9.1 Optical distortion
        9.1.1 Thermally toughened alkaline earth silicate
               safety glass produced by vertical toughening
        9.1.2 Thermally toughened alkaline earth silicate safety
               glass produced by horizontal toughening
   9.2 Anisotropy (iridescence)
   9.3 Thermal durability
   9.4 Mechanical strength
   9.5 Classification of performance under accidental
        human impact
10 Marking
Annex A (informative) Curved thermally toughened alkaline
        earth silicate safety glass
Annex B (informative) Example of particle count

Defines tolerances, flatness, edgework, fragmentation and physical and mechanical characteristics of monolithic flat thermally toughened alkaline earth silicate safety glass for use in buildings.

This European Standard specifies tolerances, flatness, edgework, fragmentation and physical and mechanical characteristics of monolithic flat thermally toughened alkaline earth silicate safety glass for use in buildings. Information on curved thermally toughened alkaline earth silicate safety glass is given in Annex A, but this product does not form part of this European Standard. Other requirements, not specified in this European Standard, can apply to thermally toughened alkaline earth silicate safety glass which is incorporated into assemblies, e.g. laminated glass or insulating units, or undergo an additional treatment, e.g. coating. The additional requirements are specified in the appropriate product standard. Thermally toughened alkaline earth silicate safety glass, in this case, does not lose its mechanical or thermal characteristics.