Refractive Indices

706.5

1.73970

656.3

1.74319

643.8

1.74419

632.8

1.74511

589.3

1.74932

587.6

1.74950

546.1

1.75458

486.1

1.76461

480.0

1.76589

435.8

1.77705

404.7

1.78784

365.0

1.80734

Constants of Dispersion Formula

2.9679939

-1.367977910

3.030079410

1.226655310

-4.482401910

7.210522510

Relative Partial Dispersions  

0.2946

0.2448

0.2371

0.234

0.5806

0.5144

-0.0021

-0.0055

Chemical Properties

Grade

1

3

1

2

ThermalProperties

580

630

535

568

83

91

 Mechanical Properties

545

9105

3563

0.278

Stress-Optical 
Coefficient

Coloration Code

42/35

Other Properties

3.92

Internal Transmittance

2400

0.943

0.890

2200

0.977

0.955

2000

0.988

0.977

1800

0.994

0.989

1600

0.998

0.997

1400

0.999

0.998

1200

0.999

0.998

1060

0.999

0.999

1000

0.999

0.998

950

0.999

0.998

900

0.998

0.997

850

0.998

0.996

800

0.997

0.995

700

0.995

0.990

650

0.994

0.989

600

0.990

0.980

550

0.989

0.978

500

0.983

0.966

480

0.979

0.959

460

0.975

0.950

440

0.969

0.939

420

0.958

0.917

400

0.93

0.87

390

0.90

0.81

380

0.85

0.72

370

0.74

0.55

360

0.49

0.24

350

0.10

0.01

340

330

320

310

300

290

280