Refractive Indices

706.5

1.82594

656.3

1.82919

643.8

1.83011

632.8

1.83097

589.3

1.83483

587.6

1.83500

546.1

1.83962

486.1

1.84862

480.0

1.84975

435.8

1.85955

404.7

1.86881

365.0

1.88494

Constants of Dispersion Formula

3.2729098

-1.288825710

3.345136310

-6.822138110

1.121542710

-4.048565910

Relative Partial Dispersions  

0.2989

0.2490

0.2378

0.2351

0.5627

0.4988

-0.0028

-0.0082

Chemical Properties

Grade

1

3

1

2

ThermalProperties

674

706

635

660

66

74

 Mechanical Properties

804

12533

4843

0.294

Stress-Optical 
Coefficient

Coloration Code

41/33

Other Properties

4.95

Internal Transmittance

2400

2200

2000

1800

1600

1400

1200

1060

1000

950

900

850

800

700

0.997

0.995

650

0.997

0.995

600

0.997

0.994

550

0.996

0.993

500

0.994

0.989

480

0.993

0.986

460

0.990

0.981

440

0.987

0.974

420

0.981

0.963

400

0.969

0.939

390

0.957

0.915

380

0.938

0.880

370

0.89

0.80

360

0.82

0.68

350

0.68

0.47

340

0.44

0.19

330

0.12

0.01

320

310

300

290

280