Refractive Indices

706.5

1.82371

656.3

1.82738

643.8

1.82842

632.8

1.82940

589.3

1.83380

587.6

1.83400

546.1

1.83932

486.1

1.84982

480.0

1.85115

435.8

1.86278

404.7

1.87395

365.0

1.89401

Constants of Dispersion Formula

3.2618526

-1.537579410

3.315289810

1.409003310

-5.529560510

7.136036710

Relative Partial Dispersions  

0.2950

0.2455

0.2371

0.2340

0.5774

0.5116

-0.0014

-0.0039

Chemical Properties

Grade

1

3

1

3

ThermalProperties

585

625

63

70

 Mechanical Properties

670

1.28

12480

4810

0.296

Stress-Optical 
Coefficient

2.15

Coloration Code

42/35

Other Properties

4.55

Internal Transmittance

2400

0.85

0.72

2200

0.950

0.903

2000

0.979

0.958

1800

0.988

0.976

1600

0.992

0.984

1400

0.998

0.997

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

0.998

0.997

700

0.998

0.996

650

0.997

0.995

600

0.997

0.995

550

0.997

0.994

500

0.993

0.987

480

0.990

0.980

460

0.986

0.972

440

0.980

0.960

420

0.971

0.942

400

0.943

0.890

390

0.917

0.840

380

0.87

0.75

370

0.78

0.61

360

0.64

0.41

350

0.41

0.17

340

0.14

0.02

330

320

310

300

290

280