Refractive Indices

706.5

1.68853

656.3

1.69221

643.8

1.69326

632.8

1.69425

589.3

1.69875

587.6

1.69895

546.1

1.70445

486.1

1.71546

480.0

1.71687

435.8

1.72939

404.7

1.74174

365.0

1.76486

Constants of Dispersion Formula

2.7906689

-1.064497710

2.907185410

2.128660710

-1.581562510

1.714524710

Relative Partial Dispersions  

0.2899

0.2409

0.2366

0.2329

0.5993

0.5303

0.0006

0.0048

Chemical Properties

Grade  

1

1

1

1

ThermalProperties

467

519

405

446

77

84

 Mechanical Properties

405

0.56

6079

2466

0.232

Stress-Optical 
Coefficient

Coloration Code

41/37

Other Properties

4.06

Internal Transmittance

2400

0.960

0.921

2200

0.967

0.935

2000

0.984

0.969

1800

0.991

0.982

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

0.998

0.997

900

0.998

0.997

850

0.997

0.995

800

0.997

0.994

700

0.996

0.993

650

0.995

0.991

600

0.995

0.990

550

0.995

0.990

500

0.992

0.985

480

0.990

0.980

460

0.987

0.975

440

0.983

0.967

420

0.973

0.946

400

0.918

0.843

390

0.82

0.68

380

0.62

0.38

370

0.26

0.07

360

0.03

350

340

330

320

310

300

290

280