HDPE pipe during extrusion. The HDPE content is coming with the heater, in to the die, then in the cooling tank. This Acu-Energy conduit pipe is co-extruded - black within with a skinny orange jacket, to designate electrical power cables. Also called "hole flanging", hollow cavities in extruded product can https://aluminium-design02234.estate-blog.com/28796080/an-unbiased-view-of-aluminium-design