Refractive Indices

706.5

1.54257

656.3

1.54411

643.8

1.54453

632.8

1.54493

589.3

1.54670

587.6

1.54678

546.1

1.54886

486.1

1.55282

480.0

1.55332

435.8

1.55750

404.7

1.56137

365.0

1.56796

Constants of Dispersion Formula

2.3605016

-1.022745510

1.139644010

3.862263010

-3.511410310

2.191206310

Relative Partial Dispersions  

0.3065

0.2560

0.2388

0.2366

0.5373

0.4755

-0.0008

-0.0015

Chemical Properties

Grade

1

3

1

2

ThermalProperties

590

656

531

572

65

74

 Mechanical Properties

530

7989

3249

0.230

Stress-Optical 
Coefficient

Coloration Code

35/30

Other Properties

2.84

Internal Transmittance

2400

0.908

0.825

2200

0.942

0.888

2000

0.983

0.967

1800

0.992

0.984

1600

0.996

0.993

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

0.998

0.997

650

0.998

0.996

600

0.998

0.996

550

0.998

0.996

500

0.997

0.995

480

0.997

0.994

460

0.996

0.993

440

0.995

0.991

420

0.995

0.991

400

0.995

0.991

390

0.992

0.985

380

0.988

0.977

370

0.986

0.973

360

0.976

0.952

350

0.957

0.915

340

0.919

0.845

330

0.85

0.72

320

0.73

0.53

310

0.53

0.28

300

0.28

0.08

290

0.08

280