Refractive   Indices

706.5

1.61870

656.3

1.62133

643.8

1.62206

632.8

1.62276

589.3

1.62590

587.6

1.62604

546.1

1.62984

486.1

1.63734

480.0

1.63830

435.8

1.64660

404.7

1.65460

365.0

1.66901

Constants of Dispersion Formula

2.5784699

-8.397005110

2.124161710

9.199766410

-5.053500310

5.815301210

Relative Partial Dispersions  

0.2944

0.2454

0.2372

0.2338

0.5786

0.5113

0.0001

-0.0005

Chemical Properties

Grade  

1

1

1

1

ThermalProperties

497

562

442

485

86

92

 Mechanical  Properties

409

0.66

5900

2376

0.241

Stress-Optical 
Coefficient

Coloration Code

37/33

Other Properties

3.68

Internal Transmittance

2400

0.937

0.878

2200

0.950

0.903

2000

0.975

0.950

1800

0.986

0.973

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

0.998

0.997

900

0.998

0.996

850

0.997

0.995

800

0.997

0.994

700

0.991

0.995

650

0.994

0.989

600

0.995

0.991

550

0.996

0.992

500

0.994

0.988

480

0.993

0.987

460

0.992

0.984

440

0.991

0.982

420

0.990

0.981

400

0.987

0.975

390

0.981

0.963

380

0.973

0.947

370

0.961

0.924

360

0.930

0.865

350

0.86

0.74

340

0.69

0.47

330

0.33

0.11

320

0.06

310

300

290

280