... of silicon core pipes or bare pipes:40/33,50/42,48/40,32/26. 1. HDPE duct for ... . 3. 50/42, 40/33, 32/26mm...1. Adopt the mode of multi-machine co-extrusion, silicon core layer ... tensioned in the pipe. Trough using cable blowing machine, one time blowing length can be 1000 to 2000 meter under ... ability, and its suitable temperature scope is from -40 to 100.7. Convenient in construction. This will ...