Refractive Indices

706.5

1.66342

656.3

1.66579

643.8

1.66646

632.8

1.66709

589.3

1.66990

587.6

1.67003

546.1

1.67340

486.1

1.67999

480.0

1.68082

435.8

1.68799

404.7

1.69480

365.0

1.70680

Constants of Dispersion Formula

2.7324621

-1.249046010

1.856233410

9.999053610

-6.838855210

4.925793110

Relative Partial Dispersions  

0.2984

0.2485

0.2377

0.2350

0.5640

0.4999

-0.0001

-0.0013

Chemical Properties

Grade  

1

3

1

2

ThermalProperties

583

652

539

580

73

83

 Mechanical  Properties

626

9448

3704

0.275

Stress-Optical 
Coefficient

Coloration Code

38/34

Other Properties

3.57

Internal Transmittance

2400

0.941

0.886

2200

0.971

0.942

2000

0.986

0.972

1800

0.991

0.982

1600

0.998

0.996

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