Assertion: cordierite | /r/HasProperty | 2mgo.2al 2 o 3 .5sio 2
Facets:
Source sentences:
text: The objective of this invention is to provide a glass which is transformation toughened through the use of zirconia, which glass is crystallized to a cordierite (2MgO.2Al 2 O 3 .5SiO 2 ) glass-ceramic upon heat treatment.