Refractive Indices

706.5

1.61688

656.3

1.61877

643.8

1.61929

632.8

1.61979

589.3

1.62200

587.6

1.62210

546.1

1.62470

486.1

1.62974

480.0

1.63037

435.8

1.63575

404.7

1.64074

365.0

1.64930

Constants of Dispersion Formula

2.5792783

-5.681819610

2.029467110

-1.002187510

1.678755110

-7.937117910

Relative Partial Dispersions  

0.3034

0.2531

0.2375

0.2351

0.5476

0.4849

0.0005

-0.0015

Chemical Properties

Grade

1

3

1

3

ThermalProperties

657

702

600

637

66

75

 Mechanical Properties

598

0.54

8251

3247

0.270

Stress-Optical 
Coefficient

Coloration Code

37/32

Other Properties

3.63

Internal Transmittance

2400

0.909

0.827

2200

0.957

0.915

2000

0.986

0.972

1800

0.994

0.988

1600

0.997

0.994

1400

0.998

0.997

1200

0.998

0.997

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

0.998

0.996

650

0.997

0.995

600

0.997

0.995

550

0.997

0.995

500

0.997

0.994

480

0.996

0.992

460

0.995

0.991

440

0.995

0.990

420

0.993

0.987

400

0.989

0.978

390

0.983

0.966

380

0.973

0.946

370

0.951

0.905

360

0.908

0.824

350

0.82

0.67

340

0.65

0.42

330

0.37

0.14

320

0.10

0.01

310

300

290

280