Aluminum phosphate cement compositions and lamp assemblies...

Details Aluminum phosphate cement compositions and lamp assemblies... Aluminum phosphate cement compositions and lamp assemblies...

C - Chemistry, Metallurgy

04

B

240/147, 6/225

C04B 28/34 (2006.01) C04B 12/02 (2006.01) F21V 19/00 (2006.01) H01J 5/58 (2006.01)

Patent

CA 1326941

ALUMINUM PHOSPHATE CEMENT COMPOSITIONS AND LAMP ASSEMBLIES CONTAINING SAME ABSTRACT OF THE DISCLOSURE This invention relates to aluminum phosphate refractory cement compositions which comprise a mixture of aluminum phosphate containing excess phosphoric acid, relatively small particle size alumina and a mixture of relatively medium and coarse particle size inert filler materials. This cement is useful for cementing tungsten-halogen lamps into glass reflectors. The aluminum phosphate is formed with an excess of phosphoric acid which reacts with the alumina when the cement is baked at elevated temperatures.

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