Refractive Indices

706.5

1.56400

656.3

1.56575

643.8

1.56624

632.8

1.56670

589.3

1.56874

587.6

1.56883

546.1

1.57125

486.1

1.57590

480.0

1.57648

435.8

1.58147

404.7

1.58611

365.0

1.59402

Constants of Dispersion Formula

2.4196645

-8.332931410

1.539739010

-1.739165410

6.218322010

-3.062131010

Relative Partial Dispersions  

0.3034

0.2529

0.2384

0.2363

0.5488

0.4872

-0.0010

-0.0015

Chemical Properties

Grade

1

1

1

1

ThermalProperties

581

642

541

580

77

86

 Mechanical Properties

578

 1.05

8241

3315

0.243

Stress-Optical 
Coefficient

Coloration Code

36/33

Other Properties

2.83

Internal Transmittance

2400

0.930

0.864

2200

0.953

0.908

2000

0.983

0.967

1800

0.991

0.983

1600

0.997

0.995

1400

0.998

0.996

1200

0.998

0.997

1060

0.999

0.998

1000

0.999

0.998

950

0.999

0.998

900

0.998

0.997

850

0.998

0.997

800

0.998

0.996

700

0.998

0.996

650

0.997

0.995

600

0.997

0.994

550

0.997

0.994

500

0.996

0.993

480

0.996

0.992

460

0.995

0.990

440

0.994

0.988

420

0.993

0.986

400

0.989

0.978

390

0.982

0.965

380

0.970

0.94

370

0.95

0.90

360

0.90

0.80

350

0.78

0.60

340

0.54

0.29

330

0.19

0.04

320

310

300

290

280