Refractive Indices

706.5

1.71324

656.3

1.71568

643.8

1.71636

632.8

1.71700

589.3

1.71987

587.6

1.72000

546.1

1.72341

486.1

1.72998

480.0

1.73080

435.8

1.73785

404.7

1.74443

365.0

1.75579

Constants of Dispersion Formula

2.8951998

-1.170121810

2.212648510

3.849479110

-7.980830210

1.503511610

Relative Partial Dispersions  

0.3020

0.2517

0.2383

0.2361

0.5501

0.4880

-0.0025

-0.0099

Chemical Properties

Grade  

1

3

1

3

ThermalProperties

632

667

591

626

59

67

 Mechanical Properties

607

10941

4233

0.292

Stress-Optical 
Coefficient

Coloration Code

38/32

Other Properties

3.77

Internal Transmittance

2400

0.78

0.61

2200

0.927

0.86

2000

0.978

0.957

1800

0.993

0.987

1600

0.999

0.998

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

0.997

0.994

700

0.997

0.994

650

0.996

0.993

600

0.996

0.993

550

0.996

0.992

500

0.994

0.989

480

0.992

0.985

460

0.990

0.981

440

0.988

0.976

420

0.984

0.968

400

0.977

0.954

390

0.969

0.938

380

0.955

0.912

370

0.931

0.867

360

0.89

0.79

350

0.83

0.69

340

0.72

0.52

330

 0.55

 0.30

320

 0.28

 0.08

310

300

290

280