Any material containing more than one percent asbestos (as determined by Polarized Light Microscopy) that, when dry, cannot be crumbled, pulverized, or reduced to powder by hand pressure.
NONFRIABLE ASBESTOS-CONTAINING MATERIALS
Meaning of NONFRIABLE ASBESTOS-CONTAINING MATERIALS in English
Environmental engineering English vocabulary. Английский словарь экологического инжиниринга. 2012