Refractive Indices

706.5

1.73998

656.3

1.74250

643.8

1.74320

632.8

1.74386

589.3

1.74680

587.6

1.74693

546.1

1.75042

486.1

1.75716

480.0

1.75799

435.8

1.76520

404.7

1.77193

365.0

1.78356

Constants of Dispersion Formula

2.9883142

-1.451323810

2.207380210

6.208150210

-3.713447710

3.100760610

Relative Partial Dispersions  

0.3023

0.2521

0.2381

0.2360

0.5484

0.4874

-0.0021

-0.0105

Chemical Properties

Grade

1

3

1

3

ThermalProperties

663

689

603

634

62

70

 Mechanical Properties

672

11471

4589

0.250

Stress-Optical 
Coefficient

v

Coloration Code

38/32

Other Properties

4.08

Internal Transmittance

2400

0.82

0.67

2200

0.951

0.905

2000

0.983

0.966

1800

0.996

0.992

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

0.998

0.997

700

0.997

0.995

650

0.997

0.995

600

0.997

0.995

550

0.997

0.994

500

0.994

0.988

480

0.991

0.983

460

0.988

0.977

440

0.985

0.971

420

0.982

0.965

400

0.977

0.954

390

0.971

0.942

380

0.959

0.920

370

0.939

0.881

360

0.90

0.81

350

0.84

0.70

340

0.72

0.52

330

0.51

0.26

320

0.22

0.05

310

 0.03

300

290

280