Refractive Indices

706.5

1.60710

656.3

1.60960

643.8

1.61032

632.8

1.61098

589.3

1.61400

587.6

1.61413

546.1

1.61777

486.1

1.62494

480.0

1.62586

435.8

1.63380

404.7

1.64142

365.0

1.65512

Constants of Dispersion Formula1

2.5436416

-8.692521610

2.004919210

8.979535210

-4.973447310

5.355600010

Relative Partial Dispersions  

0.2952

0.2451

0.2373

0.2342

0.5776

0.5109

-0.0003

0.0001

Chemical Properties

Grade  

1

1

1

1

ThermalProperties

474

550

420

467

85

91

 Mechanical  Properties

416

0.74

6217

2514

0.237

Stress-Optical 
Coefficient

Coloration Code

36/33

Other Properties

3.56

Internal Transmittance

2400

0.946

0.894

2200

0.955

0.912

2000

0.979

0.958

1800

0.988

0.977

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

0.998

0.997

850

0.998

0.997

800

0.997

0.995

700

0.996

0.993

650

0.996

0.993

600

0.996

0.993

550

0.996

0.993

500

0.995

0.991

480

0.995

0.990

460

0.994

0.988

440

0.993

0.987

420

0.992

0.985

400

0.989

0.979

390

0.985

0.970

380

0.978

0.956

370

0.970

0.940

360

0.945

0.893

350

0.89

0.79

340

0.75

0.56

330

0.42

0.18

320

0.07

310

300

290

280