<http://webisa.webdatacommons.org/259887951>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/516197790>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/259887951> .
<http://webisa.webdatacommons.org/259887951>	<http://www.w3.org/ns/prov#value>	"wherein, M is an alkali metal selected from Na, K, Li, Rb, and Cs and wherein the glass comprises at least 1 weight percent Na2O; and wherein, R is an alkaline earth metal selected from Mg, Ca, Ba, and Sr." .
<http://webisa.webdatacommons.org/259887951>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<freshpatents.com> .