flameproof vs heatproof

flameproof

verb

  • To make flameproof. 

adj

  • Resistant to catching fire. 

heatproof

verb

  • To make insulating and incombustible. 

adj

  • insulating and incombustible 

How often have the words flameproof and heatproof occurred in a corpus of books? (source: Google Ngram Viewer )