Assertion: silicon carbide's purity | /r/HasProperty | low aluminum content
Facets:
Source sentences:
text: For preparing higher purity (green silicon-carbide), fresh and high purity (low aluminum content) raw materials are required.
text: Silicon carbide powder has a black color when the purity is low and products with purity higher than 90% is green.
text: For preparing higher purity (green silicon-carbide), fresh and high purity (low aluminum content) raw materials are required.