Metalworking fluid concentrate

A metalworking fluid concentrate with improved stability and overall performance is described, comprising (A1) 1.5 - 4.0wt% of a blend of a C8-C30 alcohol (e.g. Guerbet alcohol) with a fatty acid ester R1CO2R2 where R1 is a C8-C30 acid residue and R2 is a C1-C12 alcohol residue; (A2) 1.5 - 4.0wt% of a surfactant; (A3) 0.5 - 3.0wt% of additives selected from anti-gelling agents, foam control agents, antiwear additives, extreme pressure additives, pH buffers and biocides; (B1) 6 - 15wt% of an amine which is water-soluble at room temperature (e.g. triethanolamine); (B2) 2 - 5wt% of a corrosion inhibitor which is water-soluble at room temperature; (B3) 5 - 15wt% of a compound selected from ethylene oxide or propylene oxide block copolymers, ethylene oxide or propylene oxide random copolymers, ethylene oxide or propylene oxide polymer esters and ethylene oxide ethers; and (B4) 60-80wt% of water.