The PEEK, PAI or PPS material is used to fabricate a chemical bath housing that is substantially unreactive when exposed to many low pH or high pH liquids and that permits introduction of vibrations, in a frequency band that ranges from 20 kHz up to at least 750 kHz, into the chemical bath liquid contained in the housing, by positioning {HEAD ~ one or more transducers} at an inside wall or {TAIL ~ an outside wall} of the housing 
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The PEEK , PAI or PPS material is used to fabricate a chemical bath housing that is substantially unreactive when exposed to many low pH or high pH liquids and that permits introduction of vibrations , in a frequency band that ranges from 20 kHz up to at least 750 kHz , into the chemical bath liquid contained in the housing , by positioning { HEAD ~ one or more transducers } at an inside wall or { TAIL ~ an outside wall } of the housing
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