Refractive Indices

706.5

1.64628

656.3

1.64821

643.8

1.64875

632.8

164925

589.3

1.65150

587.6

1.65160

546.1

1.65426

486.1

1.65936

480.0

1.66000

435.8

1.66538

404.7

1.67035

365.0

1.67884

Constants of Dispersion Formula

2.6876223

-1.437518710

1.254595410

1.464229510

-1.698246110

8.804863910

Relative Partial Dispersions  

0.3041

0.2536

0.2388

0.2368

0.5396

0.4788

-0.0006

-0.0035

Chemical Properties

Grade

2

3

3

4

ThermalProperties

644

674

598

628

71

80

 Mechanical Properties

572

0.51

9758

3820

0.277

Stress-Optical 
Coefficient

Coloration Code

37/30

Other Properties

3.62

Internal Transmittance

2400

0.83

0.69

2200

0.950

0.902

2000

0.982

0.965

1800

0.993

0.986

1600

0.997

0.995

1400

0.998

0.996

1200

0.998

0.996

1060

0.998

0.996

1000

0.998

0.996

950

0.998

0.996

900

0.998

0.996

850

0.998

0.996

800

0.998

0.997

700

0.999

0.998

650

0.999

0.998

600

0.999

0.998

550

0.999

0.998

500

0.999

0.998

480

0.998

0.996

460

0.997

0.994

440

0.996

0.991

420

0.994

0.989

400

0.991

0.981

390

0.985

0.970

380

0.977

0.954

370

0.957

0.915

360

0.92

0.85

350

0.87

0.75

340

0.79

0.62

330

0.66

0.43

320

0.51

0.26

310

0.35

0.12

300

0.22

0.05

290

0.10

0.01

280