Assertion: aerated concrete | /r/MadeOf | alum slate
Facets:
value: no longer
type: TEMPORAL
Source sentences:
text: By using new formulations, containing only quartz sand, calcined gypsum, lime (mineral), cement, water and aluminum powder, Ytong produced a new type of aerated concrete which no longer contains alum slate and thus has eliminated the problem of radon exposure from this raw material.