Refractive Indices

706.5

1.71677

656.3

1.72082

643.8

1.72198

632.8

1.72307

589.3

1.72803

587.6

1.72825

546.1

1.73432

486.1

1.74656

480.0

1.74811

435.8

1.76208

404.7

365.0

Constants of Dispersion Formula

2.8752625

-9.230411910

3.528911910

1.522485310

-4.865157310

1.374076110

Relative Partial Dispersions  

0.2890

0.2401

0.2361

0.2323

0.6045

0.5347

0.0008

0.0070

Chemical Properties

Grade  

2

1

1

1

ThermalProperties

596

638

544

578

93

103

 Mechanical Properties

581

8563

3414

0.254

Stress-Optical 
Coefficient

Coloration Code

42/37

Other Properties

3.07

Internal Transmittance

2400

0.949

0.900

2200

0.965

0.932

2000

0.981

0.963

1800

0.990

0.980

1600

0.998

0.996

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

0.999

0.998

700

0.998

0.996

650

0.996

0.993

600

0.997

0.994

550

0.996

0.993

500

0.992

0.984

480

0.990

0.980

460

0.986

0.972

440

0.981

0.962

420

0.965

0.931

400

0.92

0.84

390

0.86

0.73

380

0.72

0.51

370

0.44

0.19

360

0.12

0.01

350

340

330

320

310

300

290

280