Assertion: chrysotile | /r/ObjectUse | used in the plant
Facets:
value: historically
type: TEMPORAL
Source sentences:
text: Although we were not able to obtain samples representative of all of the chrysotile historically used in the plant, available samples of chrysotile assessed in 2000 by x-ray diffraction analysis and analytical transmission electron microscopy revealed that amphibole contamination was very low (<0.001% tremolite fibre).8