Refractive Indices

706.5

1.56777

656.3

1.56948

643.8

1.56996

632.8

1.57041

589.3

1.57241

587.6

1.57250

546.1

1.57487

486.1

1.57944

480.0

1.58001

435.8

1.58491

404.7

1.58947

365.0

1.59726

Constants of Dispersion Formula

2.4325095

-8.298320110

1.460997610

1.539729110

3.727578210

-1.762167310

Relative Partial Dispersions  

0.3028

0.2524

0.2382

0.2360

0.5490

0.4872

0.0007

0.0012

Chemical Properties

Grade

1

3

1

2

ThermalProperties

593

662

78

85

 Mechanical Properties

530

 0.69

7378

2972

0.241

Stress-Optical 
Coefficient

Coloration Code

35/30

Other Properties

3.18

Internal Transmittance

2400

0.925

0.856

2200

0.956

0.914

2000

0.976

0.953

1800

0.990

0.980

1600

0.996

0.992

1400

0.998

0.996

1200

0.998

0.997

1060

0.998

0.997

1000

0.998

0.997

950

0.999

0.998

900

0.999

0.998

850

0.999

0.998

800

0.999

0.998

700

0.999

0.998

650

0.999

0.998

600

0.999

0.998

550

0.999

0.998

500

0.999

0.998

480

0.999

0.998

460

0.999

0.998

440

0.999

0.998

420

0.998

0.996

400

0.996

0.993

390

0.993

0.986

380

0.986

0.973

370

0.973

0.946

360

0.963

0.927

350

0.93

0.86

340

0.86

0.74

330

0.74

0.55

320

0.56

0.31

310

0.32

0.10

300

0.04

290

280