asbestos liner

as·bes·tos li·ner

a layer of asbestos used to line a dental casting ring so that during the heating and expansion of the investment the compression of the liner will free the investment from the restraint of the ring.

as·bes·tos lin·er

(as-bestŏs līnĕr) Material used to line a dental casting ring so that during heating and expansion of the investment the compression of the liner will free the investment from restraint of ring.