Refractive Index	nF (486nm) = 1.4631; nd (588nm) = 1.4585; nC (656nm) = 1.4564
	Reflection Loss	for two surfaces at 200nm - 9.1%; at 588nm - 6.8%;
	Birefringence Constant	3.54 nm/cm
	Abbe Constant	67.8
	Bubbles/Inclusions	none
	Fluorescence	Virtually fluorescence free
	Impurity Content	Total metallic impurities: approximately 5 ppm
	OH- Content	> 1000 ppm
	Density	2.201 g/cm3
	Specific Heat Capacity	703 J Kg-1K-1
	Thermal Conductivity	1.38 Wm-1K-1
	Coefficient of Expansion	0.55 x 10-6 /oC
	Softening Point	1600oC (2912oF)
	Annealing Point	1120oC (2048oF)
	Strain Point	1025oC (1877oF)
	Max. Service Temperature	950oC (1742oF) - continuous 1200oC (2192oF) - limited time
	Dielectric Constant	3.91 at 1kHz
	Dielectric Strength	250-400 kV/cm at 20oC
	Young's Modulus	73 GPa at 25oC
	Shear Modulus	31 GPa at 25oC
	Rupture Modulus	50 MPa at 25oC
	Bulk Modulus	36.9 GPa at 25oC
	Apparent Elastic Limit	55MPa (7980 psi)
	Compressive Strength	1.1 GPa
	Tensile Strength	50 MPa
	Poisson Ratio	0.17 at 25oC
	Knoop Hardness	500 kg/mm2
	Molecular Weight	28.09
	Class/Structure	Amorphous glass
	Chemical Stability	High resistance to water and acids (except hydrofluoric).

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