Refractive Indices

706.5

1.69079

656.3

1.69297

643.8

1.69358

632.8

1.69415

589.3

1.69668

587.6

1.69680

546.1

1.69979

486.1

1.70552

480.0

1.70624

435.8

1.71234

404.7

1.71800

365.0

1.72767

Constants of Dispersion Formula

2.8274666

-1.456846210

1.852548710

3.748582010

-7.129174910

6.778193410

Relative Partial Dispersions  

0.3047

0.2545

0.2383

0.2363

0.5431

0.4821

-0.0028

-0.0085

Chemical Properties

Grade

1

3

1

5

ThermalProperties

635

668

627

637

67

74

 Mechanical Properties

761

1.25

11080

4290

0.293

Stress-Optical 
Coefficient

Coloration Code

37/29

Other Properties

3.70

Internal Transmittance

2400

0.79

0.62

2200

0.89

0.80

2000

0.979

0.958

1800

0.987

0.974

1600

0.994

0.988

1400

0.996

0.992

1200

0.998

0.996

1060

0.998

0.997

1000

0.997

0.995

950

0.997

0.995

900

0.997

0.995

850

0.996

0.998

800

0.990

0.980

700

0.990

0.980

650

0.989

0.979

600

0.989

0.978

550

0.988

0.977

500

0.988

0.976

480

0.986

0.973

460

0.985

0.970

440

0.982

0.965

420

0.980

0.961

400

0.976

0.953

390

0.970

0.94

380

0.964

0.93

370

0.94

0.89

360

0.93

0.87

350

0.87

0.75

340

0.80

0.64

330

0.70

0.49

320

0.58

0.34

310

0.46

0.21

300

0.35

0.12

290

0.24

0.06

280

0.17

0.03