Refractive Indices

706.5

1.63342

656.3

1.63566

643.8

1.63627

632.8

1.63686

589.3

1.63950

587.6

1.63962

546.1

1.64277

486.1

1.64891

480.0

1.64969

435.8

1.65635

404.7

1.66268

365.0

1.67382

Constants of Dispersion Formula

2.6324147

-8.725176210

1.912430210

4.485933110

-1.747329510

2.860114510

Relative Partial Dispersions  

0.2989

0.2497

0.2376

0.2346

0.5615

0.4963

0.0001

-0.0020

Chemical Properties

Grade  

1

3

1

3

ThermalProperties

621

670

562

601

63

70

Mechanical  Properties

482

7731

3052

0.266

Stress-Optical 
Coefficient

Coloration Code

37/33

Other Properties

3.83

Internal Transmittance

2400

0.924

0.854

2200

0.959

0.919

2000

0.985

0.971

1800

0.992

0.985

1600

0.997

0.995

1400

0.999

0.998

1200

0.999

0.998

1060

0.999

0.998

1000

0.998

0.997

950

0.998

0.996

900

0.998

0.996

850

0.997

0.995

800

0.996

0.993

700

0.996

0.992

650

0.995

0.991

600

0.995

0.991

550

0.996

0.992

500

0.995

0.990

480

0.994

0.988

460

0.993

0.986

440

0.992

0.984

420

0.990

0.980

400

0.983

0.967

390

0.975

0.951

380

0.962

0.925

370

0.936

0.877

360

0.88

0.78

350

0.78

0.61

340

0.57

0.33

330

0.24

0.06

320

310

300

290

280