Silicone Extrude Machine（https://www.zjbaina.com/product/rubber-extruders-series/90mm-silicone-extrude-machine.html） Screw diameter ￠90 C9（－0.17～－0.257） L/D 20:1 Screw material Japan SM645　 Nitriding treatment （δ=0.4～0.7） hardness HV800~900 Max RPM 60rpm MAX Water circulation The central part of the screw has a circulating channel and a rotary joint.