Low melting glass powder is and advanced welding packaging material,made from a variety of non-metallic oxides after grading ,melting,calcining, cooling,crushing,grinding, classified, the material has a low melting temperature and sealing temperature,good chemical stability, high mechanical strength,  and widely used in  vacuum electronic and microelectronic technology,laser and infrared fields,high energy physics, energy,aerospace, automobile etc...Mutual sealing between glass,ceramic,metal and semiconductor can be realized.