It is a special plastic impeller mould, the material is nylon. 1 cavity pre-hardening steel plastic injection mould for our UK customer. it need fast cycle time around 40 seconds and need 3d printing technology to make the core and cavity insert of cooling channel to make sure that it can cool down each blade with same temperature. The conventional molding making solution is not possible to make like this. High technical mould with temperature sensor for the mould. Asia Billion can help you to realize your ideal to mass production, if you have any plastic impellers or fan blades molding project, please contact us freely