Refractive Indices

706.5

1.60190

656.3

1.60409

643.8

1.60471

632.8

1.60529

589.3

1.60790

587.6

1.60801

546.1

1.61114

486.1

1.61725

480.0

1.61802

435.8

1.62470

404.7

1.63106

365.0

1.64226

Constants of Dispersion Formula

2.5302155

-7.636917210

1.946097710

7.993629210

4.715438510

-8.474266010

Relative Partial Dispersions  

0.2981

0.2482

0.2376

0.2349

0.5665

0.5021

-0.0001

-0.0005

Chemical Properties

Grade  

1

3

2

2

ThermalProperties

525

575

80

86

Mechanical  Properties 

530

0.59

7030

2810

0.251

Stress-Optical 
Coefficient

Coloration Code

35/32

Other Properties

3.50

Internal Transmittance

2400

0.88

0.77

2200

0.940

0.884

2000

0.970

0.941

1800

0.980

0.960

1600

0.990

0.980

1400

0.998

0.996

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

0.999

0.998

600

0.999

0.998

550

0.999

0.998

500

0.999

0.998

480

0.999

0.998

460

0.998

0.996

440

0.996

0.993

420

0.994

0.989

400

0.994

0.989

390

0.992

0.983

380

0.987

0.973

370

0.979

0.958

360

0.965

0.93

350

0.94

0.89

340

0.89

0.79

330

0.77

0.59

320

0.51

0.26

310

0.15

0.02

300

290

280