Transmission range  (mm)

0.18 ~ 16.0

Refractive index within 0.26~12.00 mm

1.5122~1.3703

Reflection Loss at 10.35 mm

5.3% (2 surfaces)

Absorption Coefficient at 6mm (cm-1)

3.2×10^-4

Density (g/cm³)

4.89

Melting point (℃)

1280

Thermal conductivity at 286K  (Wm^-1K^-1)

11.72

Thermal expansion at 273K (K-1)

18.1×10^-6

Knoop hardness

82 with 500g indenter

Specific heat   (J Kgm^-1K^-1)

410

Dielectric constant at 1MHz

7.33

Elastic Coefficients

C₁₁ = 89.2  C₁₂ = 40.0  C₄₄ = 25.4

Apparent Elastic Limit (Mpa)

26.9 (3900psi)

Possion ratio

0.343

Solubility in 100g water at 23℃ (g)

0.17

Size

Diameter up to 100mm;

Inclusion

None visible

Dimension tolerance

±0.1mm

Oriential tolerance

2 arc minutes

Angle tolerance

10 arc minutes

Scratch/Dig code

40/20 to MIL-O-13830A

Parallelism

20 arc seconds

Flatness

λ/5 @ 632.8nm