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Cure of thermosetting resin is initiated by heat in the die and catalyst in uhf transmitters 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, uhf 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 uhf antennas, just as there are poor quality metal antennas, out there. we have a large inventory of 26 volt dc, multi-pole, high quality, mil-spec motors at rock-bottom prices. inquire by email. wrenches-- we stock sets of the 9 most popular sizes wrenches, (sometimes erroneously called "" wrenches). these wrenches are very difficult to find, and are a necessity to work on a great deal of military, gear, among others. brand new 9-piece sets (us made, absolutely the world''s highest quality) are $13.95 plus $2 shipping/handling in the us and possessions, $3 shipping/handling worldwide! this set includes the smallest made...a must for many applications! sizes listed in right table are in stock....available for immediate shipment! we are seeking a wholesale supplier of turns-counting dials. if you know of one, please email us. fiberglass-reinforced thermosetting resin pipe (rtrp) is available in diameters from 1 in. to 84 in., using epoxy and vinyl ester resin systems. centrifugally cast pipe is available in sizes from 1 in. through 14 in., and it is used, along with f-chem filament wound pipe, where extreme corrosion resistance, strength, and durability are required. the installation cost is less expensive than steel pipes. literature describes uhf advanced performance, epoxy, vinyl ester, high pressure, and specialty piping systems. a chart lists the size range, pressure rating, maximum temperature, types of joints, and typical applications for each type of pipe. the brochure describes 10 different joining systems, tools and accessories, and various fittings.
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