Refractive Indices

706.5

1.76514

656.3

1.76780

643.8

1.76854

632.8

1.76924

589.3

1.77236

587.6

1.77250

546.1

1.77621

486.1

1.78337

480.0

1.78427

435.8

1.79196

404.7

1.79915

365.0

1.81153

Constants of Dispersion Formula

3.0731081

-1.504320510

2.393351810

5.569665110

-1.008234610

1.187326510

Relative Partial Dispersions  

0.3018

0.2518

0.2382

0.2359

0.5515

0.4890

-0.0029

-0.0097

Chemical Properties

Grade  

1

3

1

3

ThermalProperties

655

683

620

644

61

68

 Mechanical Properties

770

1.54

12190

4720

0.291

Stress-Optical 
Coefficient

Coloration Code

39/31

Other Properties

4.50

Internal Transmittance

2400

0.75

0.56

2200

0.89

0.79

2000

0.970

0.941

1800

0.981

0.962

1600

0.995

0.990

1400

0.998

0.996

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

0.998

0.996

800

0.997

0.995

700

0.997

0.995

650

0.997

0.995

600

0.997

0.994

550

0.997

0.994

500

0.995

0.991

480

0.994

0.989

460

0.993

0.987

440

0.990

0.980

420

0.985

0.971

400

0.977

0.954

390

0.966

0.934

380

0.949

0.90

370

0.927

0.86

360

0.89

0.79

350

0.83

0.69

340

0.75

0.56

330

0.63

0.40

320

0.47

0.22

310

0.22

0.05

300

290

280