Usage History of 'heatproof'

The following chart shows how frequently 'heatproof' appeared in printed materials over time. For example, the word 'heatproof' occurred 1 time in books in 1840 and 2,216 times in 2008. From 1840 to 2008, the word 'heatproof' was used a total of 47,060 times in books scanned by Google. See Reference: Google Ngram project.

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