Refractive Indices

706.5

1.79120

656.3

1.79611

643.8

1.79752

632.8

1.79885

589.3

1.80491

587.6

1.80518

546.1

1.81265

486.1

1.82773

480.0

1.82968

435.8

1.84701

404.7

1.86430

365.0

1.89708

Constants of Dispersion Formula

3.1215977

-1.187173610

4.008587310

3.498813910

-2.584040310

2.841529010

Relative Partial Dispersions  

0.2870

0.2384

0.2360

0.2320

0.6099

0.5390

0.0015

0.0075

Chemical Properties

Grade  

1

3

1

4

ThermalProperties

430

465

80

86

 Mechanical Properties

330

0.50

5484

2237

0.226

Stress-Optical 
Coefficient

Coloration Code

43/36

Other Properties

5.19

Internal Transmittance

2400

0.950

0.903

2200

0.965

0.931

2000

0.980

0.960

1800

0.990

0.980

1600

0.996

0.992

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

0.999

0.998

800

0.998

0.996

700

0.997

0.995

650

0.997

0.995

600

0.997

0.995

550

0.997

0.994

500

0.994

0.989

480

0.991

0.982

460

0.986

0.973

440

0.977

0.955

420

0.956

0.914

400

0.90

0.81

390

0.84

0.71

380

0.75

0.56

370

0.57

0.32

360

0.28

0.08

350

340

330

320

310

300

290

280