chromium dioxide

noun
a strongly magnetic, black, semiconducting substance, CrO 2 , used as the active material in a type of recording tape.
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chromium dioxide
 
n
Also called (not in technical usage): chrome dioxide a chemical compound used as a magnetic coating on cassette tapes; chromium(IV) oxide. Formula: CrO2

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The vendor shall use chromium dioxide as the active recording element in the cartridges.
DuPont made other products on the site including chromium dioxide, which is still produced today.
When magnetic tape is used for long-term storage, chromium dioxide or evaporated metal tapes are recommended.
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