Refractive Indices

706.5

1.79071

656.3

1.79387

643.8

1.79476

632.8

1.79560

589.3

1.79935

587.6

1.79952

546.1

1.80401

486.1

1.81280

480.0

1.81391

435.8

1.82351

404.7

1.83264

365.0

1.84877

Constants of Dispersion Formula

3.1536520

-1.563063810

2.874171710

8.086808410

-1.016463510

2.961551110

Relative Partial Dispersions  

0.2983

0.2486

0.2372

0.2345

0.5662

0.5014

-0.0021

-0.0076

Chemical Properties

Grade  

1

3

1

2

ThermalProperties

602

630

559

587

59

68

 Mechanical Properties

698

1.22

11076

4249

0.303

Stress-Optical 
Coefficient

Coloration Code

40/34

Other Properties

4.51

Internal Transmittance

2400

0.85

0.73

2200

0.960

0.921

2000

0.984

0.969

1800

0.995

0.990

1600

0.998

0.996

1400

0.999

0.998

1200

0.999

0.998

1060

0.998

0.997

1000

0.998

0.997

950

0.998

0.996

900

0.998

0.996

850

0.998

0.996

800

0.998

0.997

700

0.998

0.997

650

0.998

0.997

600

0.998

0.996

550

0.997

0.995

500

0.997

0.994

480

0.996

0.993

460

0.995

0.991

440

0.992

0.985

420

0.987

0.974

400

0.974

0.949

390

0.961

0.924

380

0.949

0.90

370

0.90

0.81

360

0.82

0.68

350

0.68

0.46

340

0.38

0.15

330

0.08

0.01

320

310

300

290

280