Multi-layered aluminium brazing sheet material

A multi-layered brazing sheet material consisting of an aluminium core alloy layer provided with a first brazing clad layer material on one face of said aluminium core layer and a second brazing clad layer material on another face of said aluminium core layer, and an inter-layer on one or either sides of the core layer positioned between the aluminium core alloy layer and the first brazing clad layer material or second brazing clad layer material,

• wherein the core layer is made from 3xxx-series aluminium alloy having, in wt. %, up to 0.4% Si, up to 0.5% Fe, 0.4% to 0.75% Cu, 0.6% to 1.1% Mn, up to 0.07% Mg, up to 0.2% Cr, up to 0.25% Zr, up to 0.2% Ti, up to 0.15% Zn, balance aluminium and impurities,
• wherein the first brazing layer and the second brazing layer are made from an 4xxx-series aluminium alloy having 6% to 14% Si and up to 2% Mg, balance aluminium and impurities, and
• wherein the inter-layer(s) is made from an aluminium alloy of the 3xxx-series alloys, having, in wt. %, up to 0.6% Si, 0.2% to 0.7% Fe, up to 0.2% Cu, 1.0% to 1.6% Mn, up to 0.25% Zn, up to 0.04% Mg, up to 0.2% Cr, up to 0.2% Zr, up to 0.07% Ti, balance aluminium and impurities.