产 品 说 明                                                                                                                    

	Refractive Index	nd = 1.51680; ne = 1.51872
	Reflection Loss	8.3% at 588nm (2 surfaces)
	Abbe Constant	nd = 64.17; ne = 63.96
	Principal Dispersion	nF – nC = 0.008054 nF' - nC' = 0.008110
	Density	2.51 g/cm3
	Thermal Conductivity	1.114 W/(m*K)
	Specific Heat Capacity	0.858 J/(g*K)
	Coefficient of Expansion	a (-30/+70°C) = 7.1? 10-6/K a (20/300°C) = 8.3? 10-6/K
	Transformation Temperature, Tg	557°C
	Temperature of the glass at a viscosity of 1013 dPa? s	557°C
	Temperature of glass in at a viscosity of 107.6 dPa s	719°C
	Elasticity Modulus	82 x 103 N/mm²
	Poisson's Ratio	0.206
	Stress optical coefficient	2.77 x 10-6 mm²/N
	Knoop hardness (0.1/20)	610
	Bubble class	0
	Climatic resistance	2
	Stain resistance	0
	Acid resistance	1
	Alkali resistance	2.0
	Phosphate resistance	2.3
	Melting Frequency	I