Refractive Indices

706.5

1.67899

656.3

1.68250

643.8

1.68351

632.8

1.68445

589.3

1.68874

587.6

1.68893

546.1

1.69416

486.1

1.70460

480.0

1.70594

435.8

1.71772

404.7

1.72926

365.0

1.75049

Constants of Dispersion Formula

2.7574008

-8.487719110

3.100288610

8.507593910

3.220600810

4.309927810

Relative Partial Dispersions  

0.2909

0.2418

0.2365

0.2330

0.5938

0.5253

0.0000

0.0012

Chemical Properties

Grade  

1

3

1

2

ThermalProperties

430

495

383

422

79

87

 Mechanical Properties

376

5562

2216

0.230

Stress-Optical 
Coefficient

Coloration Code

39/34

Other Properties

 4.21

Internal Transmittance

2400

0.954

0.911

2200

0.963

0.928

2000

0.983

0.966

1800

0.990

0.980

1600

0.997

0.994

1400

0.998

0.997

1200

0.999

0.998

1060

0.999

0.998

1000

0.998

0.997

950

0.998

0.997

900

0.998

0.997

850

0.998

0.996

800

0.997

0.995

700

0.997

0.994

650

0.996

0.993

600

0.996

0.993

550

0.996

0.993

500

0.994

0.989

480

0.993

0.987

460

0.991

0.983

440

0.989

0.978

420

0.985

0.970

400

0.974

0.948

390

0.961

0.923

380

0.940

0.883

370

0.90

0.81

360

0.81

0.65

350

0.61

0.37

340

0.24

0.06

330

0.03

320

310

300

290

280