Refractive Indices

706.5

1.73617

656.3

1.73874

643.8

1.73946

632.8

1.74014

589.3

1.74317

587.6

1.74330

546.1

1.74690

486.1

1.75384

480.0

1.75471

435.8

1.76214

404.7

1.76907

365.0

1.78109

Constants of Dispersion Formula

2.9753491

-1.461347010

2.109638310

1.198038010

-1.188738810

7.344435010

Relative Partial Dispersions  

0.3018

0.2516

0.2384

0.2361

0.5493

0.4872

-0.0030

-0.0103

Chemical Properties

Grade  

1

3

1

3

ThermalProperties

590

621

550

582

58

63

 Mechanical Properties

698

1.43

10678

4084

0.307

Stress-Optical 
Coefficient

Coloration Code

 38/30

Other Properties

4.16

Internal Transmittance

2400

0.80

0.64

2200

0.939

0.881

2000

0.976

0.952

1800

0.989

0.979

1600

0.996

0.992

1400

0.998

0.996

1200

0.998

0.997

1060

0.999

0.998

1000

0.999

0.998

950

0.999

0.998

900

0.999

0.997

850

0.998

0.996

800

0.998

0.995

700

0.997

0.994

650

0.997

0.993

600

0.997

0.993

550

0.997

0.993

500

0.995

0.990

480

0.993

0.987

460

0.992

0.984

440

0.988

0.977

420

0.985

0.970

400

0.978

0.956

390

0.970

0.940

380

0.954

0.910

370

0.93

0.86

360

0.88

0.78

350

0.81

0.65

340

0.71

0.50

330

0.57

0.32

320

0.41

0.17

310

0.25

0.06

300

0.10

0.21

290

280