Refractive Indices

706.5

1.63903

656.3

1.64209

643.8

1.64298

632.8

1.64380

589.3

1.64752

587.6

1.64769

546.1

1.65222

486.1

1.66124

480.0

1.66240

435.8

1.67257

404.7

1.68259

365.0

1.70125

Constants of Dispersion Formula

2.6399644

-1.164571810

2.306173310

1.734821910

-1.398605910

1.391667010

Relative Partial Dispersions  

0.2920

0.2427

0.2366

0.2331

0.5923

0.5242

0.0004

0.0042

Chemical Properties

Grade  

2

1

2

1

ThermalProperties

546

579

480

516

94

110

Mechanical  Properties

507

8050

3228

0.247

Stress-Optical 
Coefficient

Coloration Code

40/36

Other Properties

2.73

Internal Transmittance

2400

0.932

0.869

2200

0.953

0.908

2000

0.978

0.956

1800

0.989

0.979

1600

0.995

0.990

1400

0.997

0.995

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

0.999

0.998

700

0.999

0.998

650

0.997

0.995

600

0.996

0.993

550

0.995

0.991

500

0.991

0.983

480

0.989

0.979

460

0.986

0.973

440

0.984

0.969

420

0.980

0.961

400

0.960

0.921

390

0.927

0.859

380

0.85

0.72

370

0.66

0.43

360

0.26

0.07

350

0.05

340

330

320

310

300

290

280