heatproof vs inflammable

heatproof

adj
  • insulating and incombustible 

verb
  • To make insulating and incombustible. 

inflammable

noun
  • Any inflammable substance. 

adj
  • Incapable of burning; not easily set on fire. 

  • Capable of burning; easily set on fire. 

  • Easily excited; set off by the slightest excuse; easily enraged or inflamed. 

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