Assertion: lignin's amount | /r/HasProperty | greater than 20%
Facets:
Source sentences:
text: Because of the comparably poor electrical conductivity, remarkable amounts (greater than 20% mass) of carbon needed to be added to the polymer to achieve electrical conductivity (Li et al. 2000; Gindl-Altmutter et al. 2015; Köhnke et al. 2016).