Toxic Material Once Widely Used in Fireproofing
This page is the CodyCross answer for the clue below from Tundra and Taiga, Group 1686, Puzzle 2 (Trans Siberian Railway).
Question is: Toxic Material Once Widely Used in Fireproofing
and the answer is: ASBESTOS
Word Meaning:
ASBESTOS — (mineralogy) 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.
Definitions from Wiktionary.