Assertion: resin's characteristic | /r/HasProperty | difficult to determine
Facets:
value: very
type: DEGREE
Source sentences:
text: However, characteristics of exposure are very difficult to determine, bearing in mind that volumes of the materials used are very small, the residence time within the body of chemicals that take part in setting reactions is usually very short and the chemical and toxicological profiles of the set material are usually very different to those of the starting materials.