Refractive Indices

706.5

1.78018

656.3

1.78300

643.8

1.78379

632.8

1.78453

589.3

1.78785

587.6

1.78800

546.1

1.79195

486.1

1.79959

480.0

1.80055

435.8

1.80878

404.7

1.81649

365.0

1.82981

Constants of Dispersion Formula

3.1212281

-1.411990910

2.652062210

4.041576310

1.426063410

3.164256010

Relative Partial Dispersions  

0.3012

0.2510

0.2381

0.2358

0.5537

0.4911

-0.0030

-0.0090

Chemical Properties

Grade

1

3

1

3

ThermalProperties

662

697

620

646

62

70

 Mechanical Properties

795

12223

4727

0.293

Stress-Optical 
Coefficient

Coloration Code

39/32

Other Properties

4.56

Internal Transmittance

2400

0.83

0.69

2200

0.960

0.922

2000

0.986

0.972

1800

0.997

0.995

1600

0.999

0.998

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

0.999

0.998

700

0.999

0.998

650

0.998

0.997

600

0.998

0.997

550

0.997

0.995

500

0.996

0.993

480

0.995

0.991

460

0.993

0.987

440

0.991

0.983

420

0.988

0.977

400

0.981

0.963

390

0.973

0.947

380

0.960

0.921

370

0.936

0.877

360

0.90

0.81

350

0.84

0.70

340

0.74

0.55

330

0.59

0.35

320

0.35

0.12

310

0.07

300

290

280