Duct Rod

INTRODUCTION : Duct rods are manufactured from premium materials formulated to offer the high performance & durability demanded by our customers. The core of the rod is manufactured by the pultrusion process. This involves impregnating high strength continuous glass fiber filaments with a liquefied resin. The fibers are drawn in to a heated die where the resin matrix is cured, bonding the fibers together and allowing mecha- nical loads to be transmitted through the matrix and distri- buted amongst the fibers. The resulting pultruded rod combines both the high stiffness required to push the rod through long distances of ducting, with the flexibility to handle tight bends without damage. This inner core is then coated with a highly durable, scratch resistant polypropylene sheath which protects the core from mechanical damage

Rod Selection Which is the right rod diameter for any given application? The rod selection is usually governed by several factors,

including : 

•  The size of ducting it is to be pushed through 
•  The distance the rod is to be pushed 
•  The number and tightness of bends in the ducting 
•  If the ducting is already occupied by cable.

When being pushed through the duct, any rod will tend to form “sine waves”, hitting the wall of the duct at certain intervals. Each time the rod comes in contact with the wall of the duct, it causes friction. The friction will build and eventually prevent the rod from being pushed any further. Small rod in large duct will make a higher pressure contact with the ducting; the same rod in smaller duct will make less pressure on contact and therefore less friction, so it can be pushed further. Large rod in small ducting is a good situation, but reduced flexibility of the rod may cause increased friction in the tighter bends. The chart below is a rough guide as to rod diameter selection, but the above factors should all be taken into consideration before making the final selection.