... Borosilicate glass Cu/SS-ALN(H)/SS-ALN(L)/ALN coatedThickness of glass tube1.6mmVacuum tube ... port, overflow, water inlet and outlet, electric heater is optionWelding:Argon arc weldingFastening pieces:stainless steel screw5 ... advance and 70% balance against copy of B/L or L/C, For sample T/T 100% 3). ... : 10 working days after receiving deposit or original L/C.4). Warranty: 5 years,If any leakage ...