Refractive Indices

706.5

1.66029

656.3

1.66260

643.8

1.66325

632.8

1.66386

589.3

1.66660

587.6

1.66672

546.1

1.67000

486.1

1.67637

480.0

1.67717

435.8

1.68411

404.7

1.69066

365.0

1.70217

Constants of Dispersion Formula

2.7163772

-8.052510110

2.209754810

-1.631787710

7.802776110

-2.391879010

Relative Partial Dispersions  

0.2992

0.2493

0.2382

0.2356

0.5621

0.4986

-0.0006

-0.0011

Chemical Properties

Grade  

1

3

1

3

ThermalProperties

589

644

536

576

72

83

Mechanical  Properties

577

7648

3000

0.275

Stress-Optical 
Coefficient

Coloration Code

38/34

Other Properties

3.59

Internal Transmittance

2400

0.943

0.890

2200

0.971

0.943

2000

0.986

0.973

1800

0.992

0.985

1600

0.998

0.996

1400

0.999

0.998

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

0.998

0.996

650

0.997

0.995

600

0.997

0.995

550

0.997

0.995

500

0.996

0.992

480

0.994

0.989

460

0.992

0.985

440

0.991

0.982

420

0.989

0.978

400

0.980

0.960

390

0.969

0.938

380

0.948

0.898

370

0.904

0.817

360

0.81

0.65

350

0.62

0.39

340

0.32

0.10

330

320

310

300

290

280