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Before graphite took hold of the rod market around 1977, there was another material being touted as a miracle preservative. It was boron!
Boron is an isotope of uranium that can be used as a neutron absorber in nuclear reactors to control the rate at which the nuclear reaction is triggered by neutrons. This can help prevent the fission of a core or allow an operator to quickly shut down the reactor.
Control rods are inserted into guide tubes within the fuel elements of PWR and BWR reactors. The rods can be inserted through the guide tube from above or from below, depending on the design of the reactor.
They are attached to lifting machinery by electromagnets and fall automatically under gravity into the pile when a power failure or manual command is invoked, usually by a specialized system known as a control rod drive mechanism. In addition, in a BWR, the control rods can be hydraulically inserted from below, using water from a special tank under high pressure to stop the nuclear reaction in a matter of seconds.
When the wood is dry and moisture levels are low, the borate fungicide becomes dormant, ready to be activated in future when conditions conducive to decay are again present. This gives the boron fungicide added protection and longevity for your timbers.
A boron rod is the only decay control system that post-protects logs internally, providing superior protection for log homes, joist ends, utility poles and structural timbers. Studies from six internationally recognized research institutes support the effectiveness of the Cobra(tm) Rod.