Refractive Indices

706.5

1.60774

656.3

0.60954

643.8

1.61005

632.8

1.61052

589.3

1.61262

587.6

1.61272

546.1

1.61521

486.1

1.62000

480.0

1.62060

435.8

1.62570

404.7

1.63043

365.0

1.63850

Constants of Dispersion Formula

2.5584621

-9.745728310

1.511049510

2.327333310

1.113724910

1.642476710

Relative Partial Dispersions  

0.3037

0.2532

0.2384

0.2364

0.5447

0.4834

0.0001

-0.0012

Chemical Properties

Grade

1

3

2

3

ThermalProperties

662

708

602

640

67

76

 Mechanical Properties

516

8253

3256

0.267

Stress-Optical 
Coefficient

Coloration Code

36/31

Other Properties

3.57

Internal Transmittance

2400

0.905

0.819

2200

0.952

0.906

2000

0.985

0.970

1800

0.993

0.987

1600

0.998

0.996

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

0.998

0.996

850

0.997

0.995

800

0.996

0.993

700

0.996

0.993

650

0.996

0.992

600

0.996

0.992

550

0.995

0.991

500

0.995

0.990

480

0.994

0.988

460

0.993

0.986

440

0.992

0.984

420

0.992

0.984

400

0.989

0.979

390

0.985

0.971

380

0.978

0.956

370

0.963

0.928

360

0.934

0.873

350

0.88

0.78

340

0.79

0.62

330

0.63

0.40

320

0.41

0.17

310

0.17

0.03

300

290

280