Abstract
Some kinds of the electrical cables and elastomer/plastomer materials, though having high outgassing rates, are occasionally used in a high vacuum system. In order to evaluate the ultimate pressure of the system in which those materials are to be installed, their outgassing rates have been measured as a function of pumping time by a through-put method. The outgassing rates of the cables and glass-fiber sleevings ranged from 10-9 to 10-5 Pa·m3. s-1. m-1 at 100 h, depending on the insulation materials or varnishing treatment. From the tests of the elastomer/plastomer materials, it was ascertained that the organic materials give high outgassing rates of the orders of 10-5 to 10-3 Pa·m3·s-1·m-2 at 100 h.
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