Refractive Indices

706.5

1.63308

656.3

1.63505

643.8

1.63561

632.8

1.63613

589.3

1.63844

587.6

1.63854

546.1

1.64129

486.1

1.64657

480.0

1.64723

435.8

1.65287

404.7

1.65813

365.0

1.66715

Constants of Dispersion Formula

2.6365277

-9.755846410

1.714366510

2.259249710

3.085534210

4.583191710

Relative Partial Dispersions  

0.3030

0.2525

0.2384

0.2362

0.5473

0.4875

-0.0007

-0.0040

Chemical Properties

Grade

1

3

2

4

ThermalProperties

655

697

601

636

71

79

 Mechanical Properties

512

8711

3423

0.272

Stress-Optical 
Coefficient

Coloration Code

38/33

Other Properties

3.69

Internal Transmittance

2400

0.88

0.78

2200

0.945

0.893

2000

0.981

0.962

1800

0.991

0.982

1600

0.997

0.994

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

0.999

0.998

700

0.999

0.998

650

0.999

0.998

600

0.999

0.998

550

0.999

0.998

500

0.997

0.995

480

0.996

0.993

460

0.994

0.989

440

0.993

0.986

420

0.991

0.983

400

0.983

0.967

390

0.974

0.948

380

0.952

0.907

370

0.911

0.83

360

0.82

0.68

350

0.66

0.43

340

0.37

0.14

330

0.08

0.01

320

310

300

290

280