Refractive Indices

706.5

1.70648

656.3

1.71032

643.8

1.71142

632.8

1.71245

589.3

1.71715

587.6

1.71736

546.1

1.72310

486.1

1.73464

480.0

1.73613

435.8

1.74930

404.7

1.76244

365.0

1.78736

Constants of Dispersion Formula

2.8508499

-1.323461010

2.941532510

2.554266610

-2.123213310

2.226193610

Relative Partial Dispersions  

0.2893

0.2404

0.2362

0.2324

0.6033

0.5337

0.0011

0.0078

Chemical Properties

Grade  

1

1

1

1

ThermalProperties

591

628

531

566

93

106

 Mechanical Properties

520

8826

3518

0.254

Stress-Optical 
Coefficient

Coloration Code

42/36

Other Properties

3.06

Internal Transmittance

2400

0.940

0.883

2200

0.960

0.922

2000

0.980

0.960

1800

0.990

0.980

1600

0.998

0.997

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

0.998

0.996

650

0.996

0.994

600

0.996

0.993

550

0.995

0.991

500

0.991

0.982

480

0.988

0.976

460

0.984

0.968

440

0.979

0.958

420

0.966

0.934

400

0.923

0.852

390

0.87

0.75

380

0.73

0.53

370

0.44

0.19

360

0.09

0.01

350

340

330

320

310

300

290

280