Refractive Indices

706.5

1.71238

656.3

1.71511

643.8

1.71588

632.8

1.71660

589.3

1.71985

587.6

1.72000

546.1

1.72391

486.1

1.73159

480.0

1.73256

435.8

1.74098

404.7

1.74901

365.0

1.76329

Constants of Dispersion Formula

2.8876161

-1.132240610

2.346206610

8.791557810

-3.937272410

4.435317410

Relative Partial Dispersions  

0.2969

0.2472

0.3275

0.2347

0.5697

0.5047

0.0002

-0.0016

Chemical Properties

Grade  

1

3

1

3

ThermalProperties

584

637

538

576

73

84

 Mechanical Properties

578

10143

3925

0.292

Stress-Optical 
Coefficient

Coloration Code

40/35

Other Properties

 3.89

Internal Transmittance

2400

0.944

0.892

2200

0.979

0.959

2000

0.990

0.980

1800

0.995

0.991

1600

0.999

0.998

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

0.999

0.998

850

0.998

0.997

800

0.998

0.996

700

0.997

0.994

650

0.996

0.993

600

0.996

0.993

550

0.996

0.992

500

0.993

0.986

480

0.991

0.982

460

0.988

0.976

440

0.983

0.967

420

0.975

0.951

400

0.951

0.905

390

0.925

0.856

380

0.88

0.77

370

0.79

0.63

360

0.62

0.39

350

0.36

0.13

340

0.09

0.01

330

320

310

300

290

280