... :1x10^-10Pa.L/S Metallic welded bellows are widely used in aerospace, vacuum industry, semiconductor industry, solar energy photovoltaic industry, ... and also imported Korean stamping equipments. For better quality test of the welded bellows, it also equipped high precision vacuum life test ... temperature -250/450°C(316L), -250/800°C(AM350),The highest vacuum leak rate1*10-10Pa·L/SMaterialVacuum SUS 316L ...