Refractive Indices

706.5

1.66441

656.3

1.66679

643.8

1.66745

632.8

1.66808

589.3

1.67090

587.6

1.67103

546.1

1.67440

486.1

1.68098

480.0

1.68181

435.8

1.68897

404.7

1.69576

365.0

1.70771

Constants of Dispersion Formula

2.7316187

-9.572925410

2.074914110

4.689910510

-7.830578010

2.259335110

Relative Partial Dispersions  

0.2987

0.2489

0.2378

0.2351

0.5635

0.4993

-0.0003

-0.0015

Chemical Properties

Grade  

1

3

1

2

ThermalProperties

583

652

540

580

73

83

Mechanical  Properties

626

9696

3807

0.273

Stress-Optical 
Coefficient

Coloration Code

38/34

Other Properties

3.58

Internal Transmittance

2400

0.943

0.889

2200

0.971

0.942

2000

0.986

0.972

1800

0.992

0.984

1600

0.998

0.997

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

0.998

0.997

850

0.998

0.996

800

0.995

0.991

700

0.995

0.990

650

0.995

0.990

600

0.994

0.989

550

0.994

0.989

500

0.992

0.985

480

0.991

0.983

460

0.990

0.980

440

0.988

0.976

420

0.985

0.971

400

0.976

0.953

390

0.964

0.930

380

0.941

0.886

370

0.89

0.80

360

0.79

0.63

350

0.58

0.34

340

0.23

0.06

330

320

310

300

290

280