Refractive Indices

706.5

1.46704

656.3

1.46829

643.8

1.46864

632.8

1.46897

589.3

1.47040

587.6

1.47047

546.1

1.47214

486.1

1.47533

480.0

1.47572

435.8

1.47907

404.7

1.48215

365.0

1.48736

Constants of Dispersion Formula

 2.1387715

 -9.647612210

 8.696348710

 2.287728610

-1.368426310

  7.599432310

Relative Partial Dispersions  

 0.3097

0.2585 

 0.2372

0.2359 

 0.5313

0.4732

 -0.0001

 -0.0006

Chemical Properties

Grade

1

3

5

5

ThermalProperties

399

497

365

411

78

82

Mechanical Properties

374

4828

1955

0.235

Stress-Optical 
Coefficient

Coloration Code

33/29

Other Properties

2.30

Internal Transmittance

2400

2200

2000

1800

1600

1400

1200

1060

1000

950

900

850

800

700

0.999

0.998

650

0.998

0.997

600

0.998

0.997

550

0.998

0.997

500

0.997

0.994

480

0.996

0.993

460

0.996

0.992

440

0.994

0.988

420

0.994

0.988

400

0.995

0.990

390

0.994

0.998

380

0.990

0.990

370

0.992

0.984

360

0.989

0.978

350

0.981

0.963

340

0.965

0.932

330

0.931

0.867

320

0.86

0.74

310

0.73

0.53

300

0.50

0.25

290

0.24

0.06

280