scope:

This Japanese Industrial Standard specifies the tempered fire resistance glass which is rectangular or square in shape and used for fire protection equipment in buildings. The tempered fire resistance glass constituting sealed insulating glass, laminated glass and laminated sealed insulating glass is also within the scope of this Standard.

NOTE: The tempered fire resistance glass is a glass manufactured to be suitable for fire protective purposes by the following process: The soda lime glass, used as a base material, is cut to the specified dimensions, given a special polishing around the edge, and then given a controlled thermal treatment to induce compressive stress on the glass surface, and the edge strength is increased so that its heat crack resistance is enhanced.