Refractive Indices

706.5

1.51369

656.3

1.51549

643.8

1.51592

632.8

1.51632

589.3

1.51810

587.6

1.51818

546.1

1.52027

486.1

1.52428

480.0

1.52479

435.8

1.52905

404.7

1.53302

365.0

1.53982

Constants of Dispersion Formula

2.2727128

-9.503807010

1.154474510

2.643155310

-1.265556310

1.088076210

Relative Partial Dispersions  

0.3055

0.2548

0.2379

0.2359

0.5421

0.4810

-0.0008

-0.0032

Chemical Properties

Grade

3

1

3

1

ThermalProperties

511

587

466

509

96

108

 Mechanical Properties

456

6971

2858

0.220

Stress-Optical 
Coefficient

Coloration Code

35/31

Other Properties

2.50

Internal Transmittance

2400

0.87

0.76

2200

0.905

0.819

2000

0.953

0.909

1800

0.981

0.962

1600

0.996

0.993

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

0.998

0.997

700

0.998

0.997

650

0.998

0.996

600

0.998

0.996

550

0.998

0.996

500

0.997

0.995

480

0.997

0.995

460

0.997

0.994

440

0.997

0.994

420

0.996

0.993

400

0.995

0.990

390

0.992

0.985

380

0.987

0.975

370

0.978

0.957

360

0.958

0.917

350

0.914

0.835

340

0.82

0.68

330

0.64

0.41

320

0.35

0.12

310

0.07

300

290

280