Refractive Indices

706.5

1.72724

656.3

1.72968

643.8

1.73037

632.8

1.73101

589.3

1.73387

587.6

1.73400

546.1

1.73739

486.1

1.74394

480.0

1.74476

435.8

1.75176

404.7

1.75827

365.0

1.76947

Constants of Dispersion Formula

2.9466133

-1.481361210

2.075329110

7.108760810

-4.178079010

2.589666810

Relative Partial Dispersions  

0.3026

0.2523

0.2378

0.2356

0.5484

0.4865

-0.0021

-0.0098

Chemical Properties

Grade

1

3

1

3

ThermalProperties

639

676

597

626

54

64

 Mechanical Properties

770

11387

4401

0.294

Stress-Optical 
Coefficient

Coloration Code

37/29

Other Properties

4.01

Internal Transmittance

2400

0.81

0.65

2200

0.948

0.899

2000

0.981

0.962

1800

0.992

0.985

1600

0.998

0.997

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

0.998

0.997

800

0.998

0.996

700

0.997

0.995

650

0.997

0.994

600

0.997

0.994

550

0.997

0.994

500

0.996

0.992

480

0.995

0.990

460

0.993

0.987

440

0.992

0.984

420

0.989

0.979

400

0.984

0.969

390

0.978

0.957

380

0.969

0.938

370

0.951

0.905

360

0.924

0.853

350

0.88

0.78

340

0.82

0.67

330

0.73

0.53

320

0.62

0.39

310

0.49

0.24

300

0.35

0.12

290

0.20

0.04

280

0.06