Specialist glass from Vetrotech Saint Gobain, the world's leading manufacturer of fire resisting glass. is being installed in the largest and most prestigious cruise liner of all time -- the [Pounds sterling]550 million Queen Mary 2. set to carry her first fare-paying passengers to Florida in January. Vetrotech Saint Gobain is supplying 1400 square metres of SGG Pyroswiss Extra for doorways between passenger cabins and their own external balconies -- a product that can be incorporated into double-glazed units, used in conjunction with solar control glass or low emissivity coatings for increased thermal insulation.