Construction material used for its fire resistance, but is now known to be carcinogenic

Answer of Word Craze Construction material used for its fire resistance but is now known to be carcinogenic

This is a tricky question of Word Craze which last appeared on Level 424. Meanings or answers can change from time to time with each game update if you noticed a change on the answer of this clue please do let us know by commenting below so we can fix it A.S.A.P.
The solution below is:

For other clue answers of Level 424 Word Craze Level 424 Answer open the the level link.