Refractive Indices

706.5

1.77126

656.3

1.77598

643.8

1.77734

632.8

1.77862

589.3

1.78446

587.6

1.78472

546.1

1.79190

486.1

1.80645

480.0

1.80834

435.8

1.82518

404.7

1.84211

365.0

Constants of Dispersion Formula

3.0551250

-1.215054310

3.838247710

3.203138410

2.409695510

2.967491810

Relative Partial Dispersions  

0.2867

0.2380

0.2357

0.2317

0.6147

0.5433

0.0022

0.0128

Chemical Properties

Grade  

1

3

1

3

ThermalProperties

433

478

385

420

82

92

 Mechanical Properties

390

0.38

5733

2301

0.246

Stress-Optical 
Coefficient

Coloration Code

43/37

Other Properties

4.87

Internal Transmittance

2400

0.956

0.914

2200

0.970

0.941

2000

0.984

0.969

1800

0.991

0.983

1600

0.998

0.996

1400

0.998

0.997

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

0.998

0.996

700

0.993

0.987

650

0.993

0.986

600

0.993

0.986

550

0.993

0.986

500

0.990

0.980

480

0.984

0.969

460

0.976

0.953

440

0.963

0.928

420

0.935

0.874

400

0.85

0.72

390

0.73

0.53

380

0.48

0.23

370

0.14

0.02

360

350

340

330

320

310

300

290

280