Refractive Indices

706.5

1.60891

656.3

1.61164

643.8

1.61242

632.8

1.61315

589.3

1.61644

587.6

1.61659

546.1

1.62058

486.1

1.62848

480.0

1.62949

435.8

1.63829

404.7

1.64680

365.0

1.66218

Constants of Dispersion Formula

2.5449193

-8.644771610

2.241594610

7.764345810

-1.195405010

3.825720910

Relative Partial Dispersions  

0.2938

0.2444

0.2370

0.2338

0.5825

0.5156

-0.0004

-0.0009

Chemical Properties

Grade  

3

1

2

1

ThermalProperties

430

490

84

92

Mechanical Properties

430

0.63

5608

2307

0.215

Stress-Optical 
Coefficient

Coloration Code

35/32

Other Properties

3.57

Internal Transmittance

2400

0.915

0.837

2200

0.940

0.884

2000

0.970

0.941

1800

0.982

0.964

1600

0.994

0.988

1400

0.998

0.996

1200

0.998

0.996

1060

0.998

0.996

1000

0.998

0.996

950

0.998

0.996

900

0.998

0.996

850

0.998

0.996

800

0.998

0.996

700

0.999

0.998

650

0.999

0.998

600

0.999

0.998

550

0.999

0.998

500

0.999

0.998

480

0.998

0.996

460

0.998

0.996

440

0.997

0.994

420

0.996

0.992

400

0.994

0.989

390

0.989

0.979

380

0.982

0.965

370

0.977

0.955

360

0.962

0.925

350

0.929

0.863

340

0.85

0.72

330

0.63

0.40

320

0.22

0.05

310

300

290

280