Refractive Indices

706.5

1.67899

656.3

1.68251

643.8

1.68315

632.8

1.68445

589.3

1.68874

587.6

1.68893

546.1

1.69416

486.1

1.70462

480.0

1.70596

435.8

1.71786

404.7

1.72964

365.0

1.75182

Constants of Dispersion Formula

2.7617586

-1.125403910

2.822173710

1.754031510

-1.212705310

1.552238410

Relative Partial Dispersions  

0.2906

0.2415

0.2363

0.2327

0.5989

0.5299

0.0006

0.0063

Chemical Properties

Grade  

1

1

1

1

ThermalProperties

554

587

490

526

98

113

 Mechanical Properties

527

8570

3438

0.246

Stress-Optical 
Coefficient

Coloration Code

40/36

Other Properties

2.92

Internal Transmittance

2400

0.940

0.884

2200

0.961

0.923

2000

0.981

0.963

1800

0.991

0.983

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

0.996

0.993

650

0.995

0.991

600

0.996

0.993

550

0.996

0.993

500

0.994

0.988

480

0.992

0.984

460

0.990

0.980

440

0.987

0.975

420

0.982

0.964

400

0.957

0.916

390

0.920

0.847

380

0.83

0.69

370

0.60

0.36

360

0.20

0.04

350

0.02

340

330

320

310

300

290

280