Assertion: newtonian telescope's mirror | /r/HasProperty | coated with protective layer of sio
Facets:
value: for durability
type: PURPOSE
Source sentences:
text: The mirror is coated with enhanced aluminum to at least 92% reflectivity and coated with a protective layer of SiO 2 (quartz) for durability.
text: The mirror is coated with enhanced aluminum to at least 92% reflectivity and coated with a protective layer of SiO 2 (quartz) for durability.
text: The mirror is coated with enhanced aluminum to at least 92% reflectivity and coated with a protective layer of SiO 2 (quartz) for durability.
text: The mirror is coated with enhanced aluminum to at least 92% reflectivity and coated with a protective layer of SiO 2 (quartz) for durability.