fig1 shows a window structure comprising a wood frame system 1 , which has a plurality of geometrically different frame areas . the geometric structure , which is shown in fig1 , is only one example of a window structure used for test purposes , in order to be able to test different shaped fire - resistant windows at the same time . the individual frame areas have different geometric shapes depending on their function to provide different spatial closures and / or desired designs . however generally the different frame areas have no special function . fig1 and 4 show the possible arrangements of the glass panes in the frame structure ( e . g . maximum heights and widths ) and special shapes ( triangular , curved , etc ), as they must usually be tested for granting a construction permit . typically the fire - resistant glass panes 2 ( functioning panes ) in these frame areas are made from glass with a softening point above 875 ° c ., which is manufactured by the float process and thermally pre - stressed . they each have a thickness of 4 mm and a transmission for visible light in a range of from 90 to 92 %. the window structure comprises pure glass separating walls and also their combination with doors and windows in the scope of the present invention . a preferred embodiment is characterized by a glass door connected with a high window and side windows in a glass separating wall . the wood structure can be constructed in any arbitrary manner with a stop section or with a glass molding or glass frame 3 that is nailed in , screwed in or glued in on both sides of the glass pane ( fig2 and 3 ). fig2 and 3 show how the fire - resistant glass pane 2 is mounted in the wood frame 1 with a screwed - in glass molding 3 . in the embodiment shown in fig2 a glass molding 3 is attached on both sides of the glass pane 2 with attaching screws 4 . in the embodiment shown in fig3 the glass molding 3 is screwed into the wood frame 1 on only one side of the glass pane . the glass pane 2 is mounted in the wood frame 1 with its edge in the groove or recess in the wood frame 1 and the edge of the glass pane is sealed in the groove with a silicone adhesive 5 . the dimensions of the largest glass pane in this window structure amounted to 1 , 600 mm × 3 , 000 mm . the glass insertion depth amounted to 15 mm . fire testing according din en 1363 - 1 took place with this window structure . the service life of this structure amounted to more than 60 min , so that this fire - resistant window had a fire resistance class of e 60 . fig4 shows a second embodiment of a window structure comprising steel frame 6 . it has several frame areas with different geometric shapes like the first embodiment according to fig1 . what was said for the frame areas of the window structure of fig1 can also be said of the frame areas of the window structure according to fig4 . typically fire - resistant glass panes 2 ( functioning panes ) are installed in these frame areas , which are made from a glass with a softening point above 875 ° c . and a thickness of 8 mm , which is manufactured by the float process and chemically pre - stressed . the total dimensions of the window structure in the case of fig1 are 4000 mm × 3000 mm . the largest glass pane measures 1 , 300 mm × 2 , 500 mm . the glass insertion depth amounted to 15 mm . the window structure shown in fig4 , like that of the first embodiment according to fig1 , can be embodied as pure glass separating walls or with glass walls combined with doors . the steel frame 6 can be optionally constructed with a stop section or with a glass molding or glass frame that is clipped or screwed in on both sides of the glass pane , as shown in the embodiments of fig5 a or 5 b . a hollow steel strip 3 a or a steel angle bracket 3 b can be used as the glass molding or glass frame . fire testing according din en 1363 - 1 took place with these structures . the service life of the window structure of fig5 a and 5b amounted to more than 180 min , so that this fire - resistant window had a fire resistance glass of e 180 . in a third embodiment the window structure has dimensions of 4 , 000 mm × 3 , 000 mm with plural frame areas as shown in fig4 . this window structure comprises a glass pane with a softening point above 875 ° c . and a thickness of 6 mm , which was made from glass that was manufactured by the float process and chemically pre - stressed , and a counter glass pane made from 4 - mm thick ca — na glass , which is spaced from the chemically pre - stressed glass pane with a steel spacer of 12 mm , so as to form a glass insulating window structure . the largest glass pane dimension amounted to 1 , 400 mm × 2 , 800 mm . the glass insertion depth amounted to 15 mm . the stop section and screwed in glass molding were selected . fire testing took place with this window structure according to the din en 1363 - 1 . the service life of this window structure amounted to more than 120 min , so that this fire - resistant window had a fire resistance class of e 120 . the window structure , like that of example 1 , can be embodied as a pure glass separating wall or in combination with a door . the purpose of the installation of insulating glass laminates or combination structures in building interiors is usually reduction of sound wave transmission from one room to another . when used in the outer parts of a building the insulating glass laminates or combination structures can also reduce heat losses to the environment . fig6 shows the above - mentioned insulating glass laminate or combination structure , which comprises at least two glass panes , in which the first pane 2 comprises a monolithic glass pane or a combination as described in examples 1 and 2 according to the invention and the other glass pane is a counter pane 7 . an aluminum or steel spacer 8 , which is filled with a drying agent , is arranged in the intervening space 7 a between the glass panes in the edge region 2 a . a primary seal 9 and a secondary seal 10 , which comprise known sealing material , seal the laminate window structure . melt vents are optionally arranged in the spacer 8 . an unstressed ca / na ( soda lime ) glass pane , an esg glass pane , or a vsg glass pane comprising a ca — na or an esg glass pane , can be used as the counter pane 7 . the counter pane 7 can be optionally colored , printed and / or painted . according to a fourth embodiment the glass pane can be made from glass with a softening point above 875 ° c ., which is manufactured by the float process and chemically pre - stressed , which is provided with a reflective coating , a so - called low - e coating , and a sun - protective coating . the purpose for using these layers is , according to the particular application , to save energy by reducing heat loss through the window , to reduce the action of the suns rays through the window , and / or to reduce the ir or heat radiation passing through the window ( ew class window ). the layers are applied according to know sputtering , pyrolysis or dipping processes . properties , such as sun and heat protection , can be combined with high resistance to mechanical stresses and splinter - binding action by combining the coated glass pane 2 and the counter glass pane 7 described in example 3 . while the invention has been illustrated and described as embodied in a fire - resistant window , it is not intended to be limited to the details shown , since various modifications and changes may be made without departing in any way from the spirit of the present invention . without further analysis , the foregoing will so fully reveal the gist of the present invention that others can , by applying current knowledge , readily adapt it for various applications without omitting features that , from the standpoint of prior art , fairly constitute essential characteristics of the generic or specific aspects of this invention .