Refractive Indices

706.5

1.72885

656.3

1.73307

643.8

1.73427

632.8

1.73540

589.3

1.74054

587.6

1.74077

546.1

1.74706

486.1

1.75975

480.0

1.76139

435.8

1.77597

404.7

1.79046

365.0

Constants of Dispersion Formula

2.8987780

-2.090657210

4.766570410

-2.012197210

5.034048610

-1.680607910

Relative Partial Dispersions  

0.2886

0.2397

0.2358

0.2320

0.6079

0.5377

0.0012

0.0095

Chemical Properties

Grade  

1

3

1

2

ThermalProperties

449

491

388

426

75

84

 Mechanical  Properties

375

0.45

5973

2411

0.238

Stress-Optical 
Coefficient

Coloration Code

41/37

Other Properties

4.46

Internal Transmittance

2400

0.948

0.898

2200

0.962

0.925

2000

0.982

0.965

1800

0.990

0.981

1600

0.997

0.995

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

0.999

0.998

700

0.998

0.997

650

0.998

0.997

600

0.998

0.996

550

0.998

0.996

500

0.996

0.992

480

0.994

0.989

460

0.991

0.983

440

0.986

0.973

420

0.972

0.944

400

0.904

0.818

390

0.79

0.63

380

0.55

0.30

370

0.19

0.03

360

350

340

330

320

310

300

290

280