Products,Glazing Techniques and Maintenance

1 GGF Datasheet for the Quality ofThermally Toughened Soda Lime Silicate Safety Glass for Annex A2. Definition, characteristics and manufacturing Glass products4. Fracture characteristics5. Dimensions and tolerances6. Edge and/or surface work, holes,notches and cut-outs7. Shaped flat appearance9. test12. IdentificationAnnex and distortionsspecific to thermally toughened soda limesilicate safety glass produced by the verticaltong hung processAnnex Method of MeasuringRoller WaveAnnex of Particle datasheet defines the products andspecifies the characteristics and associatedmeasurement procedures and testmethods for thermally toughened sodalime silicate safety glass that is incompliance with BS EN characteristics length,width, thickness and flatness.

2 And theirapplicable tolerances are specified forthermally toughened soda lime silicatesafety glass. Recommendations are alsomade on the dimensions and tolerances of acceptableedgework are also :Tolerances etc. specific to thevertical tong hung process are given inannex test method is described for assessingthe fragmentation of thermally toughenedsoda lime silicate safety glass to show howthe quality and consistency of manufacturecan be requirements, not specified in thisdatasheet, may apply to thermallytoughened soda lime silicate safety glasswhich is incorporated into assemblies, glass or insulating glass units, orundergo an additional treatment.

3 Additional requirements are specified inthe appropriate product soda lime silicate safety glass,inthis case, does not lose its mechanical orthermal data sheet does not apply to curvedthermally toughened soda lime silicatesafety :GGF Data Sheet coversthese Definitions, characteristics andmanufacturing processesWhere appropriate these definitions havebeen taken from EN edge deformation Deformation of the edge caused by thetong edge lift(also referred to as edge dip) Distortion produced in horizontaltoughened glass,at the leading and trailingedge of the is a distortionproduced by a reduction in surface flatness enamelled thermally toughenedsoda lime silicate safety glass thermally toughened soda lime silicatesafety glass which has a ceramic frit firedinto the surface during the tougheningprocess.

4 After toughening the ceramic fritbecomes an integral part of the glass NOTE 1:Also known as opaque thermallytoughened soda lime silicate safety 2:The application of the ceramicfrit may be by a continuous process ordiscontinuous application, enamelled surface could bepartially or wholly flat thermally toughened sodalime silicate safety glass thermally toughened soda lime silicatesafety glass which has not been deliberatelygiven a specific profile during manufacture thermally toughened soda limesilicate safety glass Glass within which a permanent surfacecompressive stress, additionally to the basicmechanical strength.

5 Has been induced by acontrolled heating and cooling process inorder to give it greatly increased resistanceto mechanical and thermal stress andprescribed fragmentation characteristics NOTE:The mechanical properties, durability and mechanical strength,and safety properties, fragmentationcharacteristics, are generated by the levelof surface propertiesare not size horizontal process Process in which the glass is supported onhorizontal rollers local distortion Local deformation of vertically toughenedglass underneath the tong marks Products.

6 Glazing Techniques and MaintenanceSECTION 4 August overall bow deformation of the whole pane ofhorizontally and vertically toughened glasscaused by the heating and cooling process roller wave distortion distortion produced in horizontaltoughened glass as a result of the glassbeing in contact with the rollers during thetoughening is the surfacedistortion produced by a reduction insurface flatness vertical tong hung process process in which the glass is suspended by tongsNOTE:This process is now of very Glass products thermally toughened soda lime silicatesafety glass is made from a monolithic glassgenerally corresponding to one of thefollowing standards: soda lime silicate glass products according to EN 572-1 including; float glass according to EN 572-2; drawn sheet glass according to EN 572-4; patterned glass according to EN 572-5; supplied and final cut sizes according to EN 572-8.

7 A coated glass, with a substrate as above, that is in accordance with EN of nominal thicknesses other thanthose covered in the above standards is Fracture characteristics The fracture characteristics of thermallytoughened soda lime silicate safety glass aredirectly related to the amount of surfacecompression, these properties are not size the thermally toughened soda limesilicate safety glass is manufactured with anappropriate degree of surface compressionthen in the event of breakage the thermallytoughened soda lime silicate safety glassfractures into numerous small pieces, theedges of which are generally.

8 The degree of surface compressionrequired is dependent upon glass type and fragmentation test described in clause11 is undertaken on unrestrained fragmentation in service may notalways correspond to that determinedduring the fragmentation test due to theimposition of other stresses, from fixingor from reprocessing ( laminating).5 Dimensions and tolerances Nominal thickness andthickness tolerances The nominal thicknesses and thicknesstolerances are those given in the relevantproduct standard (see clause 4), some ofwhich are reproduced in Table 1a and 1a Nominal thicknesses andthickness tolerances float and patterned glass.

9 Dimensions in millimeters Table 1b Nominal thicknesses andthickness tolerances for drawn sheet andnew antiques sheet glass. Dimensions inmillimetersThe limits of squareness are described bydeviation between diagonals. Limits aregiven in Table 3 The thickness of a pane shall be determinedas for the basic measurementshall be taken at the centers of the 4 sides,and away from the area of any tong marks(see Figure 3), which may be Width and length (sizes) General When thermally toughened soda limesilicate safety glass dimensions are quotedfor rectangular panes, the first dimensionshall be the width, B, and the seconddimension the length, H, as shown in Figure1.

10 It shall be made clear which dimension isthe width, B, and which is the length, H,when related to its installed 1 Examples of width, B, andlength, H, relative to the pane shape Maximum and minimum sizes For maximum and minimum sizes, themanufacturer should be Tolerances and squarenessThe nominal dimensions for width andlength being given, the finished pane shallnot be larger than a prescribed rectangleresulting from the nominal dimensionsincreased by the tolerance, t, or smallerthan a prescribed rectangle reduced by thetolerance, sides of the prescribedrectangles are parallel to one another andthese rectangles shall have a are given in Table 2 Tolerance limits fordimensions of rectangular panesKey.