Refractive Indices

706.5

1.71470

656.3

1.71780

643.8

1.71868

632.8

1.71950

589.3

1.72323

587.6

1.72340

546.1

1.72791

486.1

1.73684

480.0

1.73797

435.8

1.74793

404.7

1.75757

365.0

1.77524

Constants of Dispersion Formula

2.8820918

-7.801887210

3.066715210

-6.931716110

1.005107310

5.163785110

Relative Partial Dispersions  

0.2944

0.2449

0.2368

0.2338

0.5825

0.5163

0.0000

0.0015

Chemical Properties

Grade  

1

3

1

3

ThermalProperties

536

600

497

532

83

90

Mechanical  Properties

493

8010

3141

0.275

Stress-Optical 
Coefficient

Coloration Code

40/35

Other Properties

4.42

Internal Transmittance

2400

0.933

0.870

2200

0.961

0.924

2000

0.982

0.964

1800

0.992

0.984

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

0.999

0.998

850

0.999

0.998

800

0.998

0.997

700

0.998

0.997

650

0.998

0.997

600

0.998

0.996

550

0.998

0.996

500

0.997

0.995

480

0.996

0.992

460

0.994

0.989

440

0.992

0.984

420

0.986

0.972

400

0.969

0.939

390

0.950

0.903

380

0.92

0.84

370

0.84

0.72

360

0.69

0.48

350

0.41

0.17

340

0.09

0.01

330

320

310

300

290

280