Specifications for Sitall (type CO115 M)

Sitall is Russian analogue of Zerodur.

Coefficient of linear thermal expansion, 10^-7 K^-1 from 213 to 333 K from 293 to 573 K	0.0 + 0.6 2.8 +/- 1.0
Specific heat, kJ/kg x K	0.92
Thermal conductivity, W/mK	1.71
Heat resistance, K	823
Density, g/cm³	2.46
Microhardness, 10⁷ Pa	784
Modulus of elongation (Young), GPa	92
Poisson's ratio	0.28
Bending strength, 10⁷ Pa	16.6
Relative abrasion hardness (referring to BK7 type of glass)	1.78
Refractive index, nd	1.536 +/- 0.004
Mean dispersion	0.0102 +/- 0.0003
Maximum dimension of blanks, mm diameter side of rectangular blank thickness	1500 1000 300

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