What are non-combustible substances? Explain with examples. Share with your friends Share 3 Pankaj Singh answered this The substances which do not burn in air are called non-combustible substances. 4 View Full Answer Maitreyee Sethi answered this Not combustible; not able to burn; as, drapery should be made of noncombustible materials .most metals, rock, and glass are non-combustible 2