Refractive Indices

706.5

1.61680

656.3

1.61878

643.8

1.61934

632.8

1.61986

589.3

1.62220

587.6

1.62231

546.1

1.62509

486.1

1.63049

480.0

1.63117

435.8

1.63698

404.7

1.64242

365.0

1.65181

Constants of Dispersion Formula

2.5835857

-8.909337210

1.669586810

3.730455910

-8.629757310

1.090865910

Relative Partial Dispersions  

0.3015

0.2511

0.2374

0.2351

0.5542

0.4912

0.0005

-0.0010

Chemical Properties

Grade  

1

3

1

3

ThermalProperties

636

701

579

621

68

74

 Mechanical  Properties

497

7684

3031

0.268

Stress-Optical 
Coefficient

Coloration Code

37/32

Other Properties

3.66

Internal Transmittance

2400

0.931

0.866

2200

0.961

0.923

2000

0.986

0.973

1800

0.993

0.987

1600

0.998

0.997

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

0.999

0.998

650

0.999

0.998

600

0.999

0.998

550

0.999

0.998

500

0.998

0.996

480

0.997

0.994

460

0.996

0.992

440

0.994

0.989

420

0.992

0.985

400

0.985

0.970

390

0.975

0.951

380

0.961

0.924

370

0.935

0.874

360

0.88

0.78

350

0.79

0.62

340

0.62

0.39

330

0.37

0.14

320

0.10

0.01

310

300

290

280