Refractive Indices

706.5

1.61787

656.3

1.61973

643.8

1.62025

632.8

1.62074

589.3

1.62290

587.6

1.62299

546.1

1.62555

486.1

1.63045

480.0

1.63106

435.8

1.63628

404.7

1.64115

365.0

1.64946

Constants of Dispersion Formula

2.5864832

-8.035782910

1.808057310

-4.597417210

8.848432110

-3.754476510

Relative Partial Dispersions  

0.3046

0.2540

0.2384

0.2364

0.5444

0.4834

-0.0010

-0.0023

Chemical Properties

Grade

1

3

2

4

ThermalProperties

646

692

590

630

66

71

 Mechanical Properties

581

0.77

10086

4073

0.238

Stress-Optical 
Coefficient

Coloration Code

36/30

Other Properties

3.56

Internal Transmittance

2400

0.88

0.77

2200

0.944

0.892

2000

0.984

0.968

1800

0.992

0.985

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

0.998

0.996

900

0.997

0.995

850

0.997

0.995

800

0.996

0.993

700

0.996

0.993

650

0.996

0.993

600

0.996

0.993

550

0.996

0.993

500

0.996

0.992

480

0.996

0.992

460

0.995

0.990

440

0.994

0.989

420

0.994

0.988

400

0.990

0.981

390

0.986

0.972

380

0.979

0.958

370

0.964

0.930

360

0.938

0.88

350

0.89

0.79

340

0.81

0.65

330

0.69

0.47

320

0.52

0.27

310

 0.33

 0.11

300

 0.17

 0.03

290

280