asbestos vs noncombustible

asbestos

noun
  • Any of several fibrous mineral forms of magnesium silicate, used for fireproofing, electrical insulation, building materials, brake linings, chemical filters, suits, fireman's gloves, etc. 

  • Any of asbestos-like forms of several minerals, asbestiforms 

verb
  • To insulate or buffer. 

  • To coat or line with asbestos. 

  • To expose to asbestos; to cause to suffer asbestosis. 

noncombustible

noun
  • Any substance that is not combustible. 

adj
  • That will not readily ignite and burn. 

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