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 Cure of thermosetting resin is initiated by heat in the die and catalyst in the resin mix. The rate of reaction is controlled by heating and cooling zones in the die. The resulting high strength profile is cut to length, ready to use as it leaves the pultrusion machine. The controversy over metal versus fiberglass antennas continues, despite the over whelming evidence in favor of fiberglass. This article summarizes the contents of a number of other separate articles which have appeared in the industry media from time to time and is intended, from an objective point of view, to add credence to our claim that fiberglass is better. The ipso facto use of fiberglass, of course, does not guarantee a good antenna and there are a few antenna manufacturers who have "missed the boat" on techniques, which means there are poor quality fiberglass antennas, just as there are poor quality metal antennas, out there. Both constructions use the same type of material, basically a thermoset FRP (fiberglass reinforced plastic), which includes specially formulated resins, flame retardants and UV stabilizers to produce the unique benefits which characterize fiberglass reflectors. Because some antenna installations must exist in environments containing many corrosive agents, the materials in the construction of the antenna must be carefully selected to alleviate corrosion problems. Obviously, in the case of an aluminum structure, dissimilar metal contact is always a risk factor. A fiberglass dish, on the other hand, all but eliminates this problem - for obvious reasons. The resins used in antennas have been subjected to both field and laboratory tests involving over 130 highly corrosive chemicals at temperatures up to at least 120° F (50° C), with results that indicated little or no detectable degradation of the test samples. Foreign Orders We do accept foreign orders. Foreign customers pay any applicable tariffs or duties, and must furnish shipping instructions. We will package and obtain exact shipping costs based on your preferred shipping method, and will provide an order total which must be prepaid before we ship. When specifying shipping instructions, please remember that our packages are usually 8 feet (96 inches) long! Interested in great deals on vacuum variable capacitors, ceramic transmitting tubes, vacuum relays, roller inductors, test equipment, and more? From time to time all of these items can be found Vacuum relays and other RF relays Vacuum variable capacitors, "doorknob" capacitors, and transmitting tubes Test equipment, receivers, and transmitters Transformers. look no further for all your fiberglass rods and products
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