Refractive Indices

706.5

1.73630

656.3

1.73906

643.8

1.73984

632.8

1.74057

589.3

1.74386

587.6

1.74400

546.1

1.74794

486.1

1.75563

480.0

1.75660

435.8

1.76496

404.7

1.77285

365.0

1.78660

Constants of Dispersion Formula

2.9657374

-9.657162410

2.602452510

3.668464110

2.820555110

-1.373992910

Relative Partial Dispersions  

0.2982

0.2484

0.2378

0.2352

0.5628

0.4988

-0.0010

-0.0064

Chemical Properties

Grade

1

3

1

3

ThermalProperties

682

736

625

667

75

83

 Mechanical Properties

511

8587

3325

0.291

Stress-Optical 
Coefficient

Coloration Code

38/32

Other Properties

4.36

Internal Transmittance

2400

0.918

0.843

2200

0.963

0.928

2000

0.982

0.965

1800

0.991

0.982

1600

0.997

0.995

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

0.998

0.996

800

0.996

0.992

700

0.995

0.991

650

0.995

0.990

600

0.994

0.989

550

0.994

0.989

500

0.992

0.985

480

0.991

0.982

460

0.989

0.978

440

0.987

0.975

420

0.986

0.972

400

0.980

0.961

390

0.974

0.948

380

0.960

0.921

370

0.934

0.872

360

0.88

0.78

350

0.81

0.65

340

0.68

0.46

330

0.48

0.23

320

0.24

0.06

310

300

290

280