Materials

Thermal Properties

	Semiconductor		Opaque
Manufacturer	GE	NSG	NSG	NSG
Grade	124	N	OP-1	OP-3
Strain Point		1090 C	1070 C	1070 C
Annealing Point		1180 C	1180 C	1180 C
Softening Point		1720 C*	1721 C*	1722 C*
Thermal Expansion (30 to 700 degrees C)		6.5 x 10^-7 /degree	^{6.0 x 10-7 /degree}	^{6.0 x 10-7 /degree}

* Extrapolated

Manufacturers: GE =Momentive (formerly known as General Electric NSG =Nippon Silica Glass (now TOSOH SGM USA) Osram =Osram Sylvania