Refractive Indices

706.5

1.74954

656.3

1.75223

643.8

1.75298

632.8

1.75369

589.3

1.75686

587.6

1.75700

546.1

1.76078

486.1

1.76809

480.0

1.76901

435.8

1.77690

404.7

1.78428

365.0

1.79705

Constants of Dispersion Formula

3.0170177

-1.362514910

2.414248910

5.952069310

-1.214658910

1.444553410

Relative Partial Dispersions  

0.3007

0.2506

0.2381

0.2357

0.5547

0.4919

-0.0024

-0.0076

Chemical Properties

Grade

1

3

1

3

Thermal Properties

598

635

557

583

55

65

 Mechanical Properties

677

10906

4184

0.303

Stress-Optical 
Coefficient

Coloration Code

39/31

Other Properties

4.25

Internal Transmittance

2400

0.83

0.69

2200

0.956

0.913

2000

0.982

0.965

1800

0.995

0.990

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

0.998

0.997

850

0.998

0.996

800

0.994

0.988

700

0.994

0.988

650

0.994

0.989

600

0.994

0.988

550

0.994

0.988

500

0.994

0.989

480

0.993

0.987

460

0.991

0.983

440

0.989

0.978

420

0.985

0.971

400

0.978

0.957

390

0.972

0.945

380

0.960

0.921

370

0.94

0.88

360

0.91

0.82

350

0.85

0.72

340

0.77

0.59

330

0.66

0.43

320

0.50

0.25

310

0.26

0.07

300

0.04

290

280