... L/S Metallic welded bellows are widely used in aerospace, vacuum industry, semiconductor industry, solar energy photovoltaic industry, medical ... equipments. For better quality test of the welded bellows, it also equipped high precision vacuum life test equipment from Taiwan, Varian VS leak ... -250/450°C(316L), -250/800°C(AM350),The highest vacuum leak rate1*10-10Pa·L/SMaterialVacuum SUS 316L,SUS 304 ...