Refractive Indices

706.5

1.57453

656.3

1.57636

643.8

1.57687

632.8

1.57735

589.3

1.57950

587.6

1.57960

546.1

1.58216

486.1

1.58712

480.0

1.58774

435.8

1.59307

404.7

1.59805

365.0

1.60665

Constants of Dispersion Formula

2.4533945

-9.217029110

1.421147110

5.226295410

-3.236290610

2.139700710

Relative Partial Dispersions  

0.3007

0.2506

0.2383

0.2360

0.5531

0.4911

0.0008

-0.0009

Chemical Properties

Grade  

1

3

1

2

ThermalProperties

576

641

511

555

78

86

 Mechanical Properties 

496

7472

2997

0.247

Stress-Optical 
Coefficient

Coloration Code

36/32

Other Properties

3.23

Internal Transmittance

2400

0.941

0.886

2200

0.958

0.917

2000

0.983

0.967

1800

0.992

0.984

1600

0.999

0.998

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

0.998

0.997

700

0.998

0.996

650

0.998

0.996

600

0.998

0.996

550

0.997

0.995

500

0.997

0.994

480

0.996

0.993

460

0.996

0.992

440

0.995

0.991

420

0.995

0.990

400

0.993

0.987

390

0.990

0.981

380

0.985

0.970

370

0.976

0.952

360

0.951

0.904

350

0.89

0.80

340

0.77

0.59

330

0.50

0.25

320

0.16

0.03

310

300

290

280