Assertion: high purity boron | /r/HasProperty | required
Facets:
Source sentences:
text: Today, boron is obtained by heating borax (Na 2 B 4 O 7 ·10H 2 O) with carbon, although other methods are used if high-purity boron is required.
text: Today, boron is obtained by heating borax (Na2B4O7·10H2O) with carbon, although other methods are used if high-purity boron is required.