Cable sheathing of a Pb—Ca—Sn alloy and method of manufacture thereof

A method for manufacturing a cable sheathing onto a power cable, wherein the method comprises the following steps:

• applying by an extruder
• a supply of molten Pb—Ca—Sn alloy, and
• a die-head adapted to receive the power cable to be coated and to exit the cable and simultaneously form a coating of supplied Pb—Ca—Sn alloy onto the power cable,
• wherein the Pb—Ca—Sn alloy has a composition comprising of from 0.0325 to 0.05 weight % Ca and of from 0.4 to 0.8 weight % Sn, based on the total mass of the alloy and where the balance is Pb and unavoidable impurities,
• wherein the extruder further has a stem adapted to solidify the Pb—Ca—Sn alloy and having an inlet fluidly connected to the supply of molten Pb—Ca—Sn alloy and an outlet for solidified Pb—Ca—Sn alloy, and
• the die-head has a cavity fluidly connected to the outlet for solidified Pb—Ca—Sn alloy, and
• wherein the method further comprises the steps of:
• supplying the Pb—Ca—Sn alloy at a temperature of from 350 to 380° C. to the stem of the extruder, and
• cooling and solidifying the Pb—Ca—Sn alloy inside the stem of the extruder to a temperature in the range of from 180 to 250° C. when exiting the stem and entering the cavity of the die-head.