Refractive Indices

706.5

1.68852

656.3

1.69221

643.8

1.69326

632.8

1.69425

589.3

1.69875

587.6

1.69894

546.1

1.70444

486.1

1.71547

480.0

1.71689

435.8

1.72948

404.7

1.74204

365.0

1.76588

Constants of Dispersion Formula

2.7919943

-1.231120610

2.880274010

2.143005910

-1.693211910

1.974176610

Relative Partial Dispersions  

0.2897

0.2407

0.2362

0.2325

0.6028

0.5333

0.0010

0.0083

Chemical Properties

Grade  

2

1

1

1

ThermalProperties

576

613

517

551

95

107

 Mechanical Properties

521

8410

3371

0.248

Stress-Optical 
Coefficient

Coloration Code

41/36

Other Properties

2.95

Internal Transmittance

2400

0.938

0.880

2200

0.959

0.920

2000

0.980

0.960

1800

0.990

0.980

1600

0.999

0.998

1400

0.999

0.998

1200

0.999

0.998

1060

0.999

0.998

1000

0.999

0.998

950

0.999

0.998

900

0.999

0.998

850

0.999

0.998

800

0.999

0.998

700

0.996

0.993

650

0.995

0.990

600

0.996

0.993

550

0.996

0.993

500

0.993

0.986

480

0.990

0.981

460

0.987

0.975

440

0.984

0.968

420

0.976

0.952

400

0.944

0.892

390

0.90

0.81

380

0.79

0.62

370

0.51

0.26

360

0.13

0.02

350

340

330

320

310

300

290

280