fibreglass vs fibreglass wool

fibreglass

noun
  • Silica based glass extruded into fibers that possess a length at least 1000 times greater than their width. 

  • A composite material made from fine fibres of spun glass held together with resin. 

verb
  • To apply fibreglass to. 

fibreglass wool

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