the form of an alkali metal salt and most preferably as the sodium or potassium salt the antifreeze concentrate of the present invention contains by weight 0 01 to 0 50 borate calculated as b 4 o 7 0 1 to 0 5 sebacate calculated as c 10 h 16 o 4 0 53 to 1 0 molybdate calculated as moo 4 0 04 to 0 22 mercaptobenzothiazole calculated as mercaptobenzothiazole 0 04 to 0 30 nitrate calculated as no 3 0 05 to 0 30 tolyltriazole calculated as tolyltriazole and 0 042 to 0 09 silicate calculated as sio 2 it is desirable to include an effective amount of an antifoaming compound in the concentrate such components are well known and preferably may be a polyglycol type or a silicone type antifoaming agent the concentrate contains small amounts of water usually 1 to 5 by weight water alkali metal hydroxide is employed to provide a final ph of 9 10 for the concentrate plus water coolant formulation sodium tetraborate is the preferred borate additive the available hydrates such as sodium tetraborate pentahydrate na 2 b 4 o 7 5h 2 o and sodium tetraborate decahydrate na 2 b 4 o 7 10h 2 o are conveniently employed the latter being preferred borate expressed as sodium tetraborate decahydrate in amount of 0 80 to 1 2 wt of the concentrate is employed in accordance with the invention in order to form sebacate sebacic acid and alkali metal hydroxide can be separately added to the formulation with the alkali metal sebacate formed in situ alternatively the sebacate salt e g sodium sebacate na 2 c 10 h 16 o 4 can be used directly sebacate expressed as sebacic acid is employed in accordance with the invention in amount of 0.