al·​si·​film | \ˈalsəˌfilm\
plural -s

Definition of alsifilm 

: an oil-resistant and heat-resistant material produced in sheets from a gel of bentonite and used especially for electrical insulation

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First Known Use of alsifilm

1938, in the meaning defined above

History and Etymology for alsifilm

aluminum silicate + film

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The first known use of alsifilm was in 1938

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