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 {HEAD ~ 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 one or more transducers at {TAIL ~ an inside wall} or an outside wall of the housing 
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 { HEAD ~ 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 one or more transducers at { TAIL ~ an inside wall } or an outside wall of the housing
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