Refractive Indices

706.5

 1.57488

656.3

1.57722

643.8

1.57789

632.8

1.57852

589.3

1.58132

587.6

1.58144

546.1

1.58481

486.1

1.59145

480.0

1.59228

435.8

1.59965

404.7

1.60676

365.0

1.61966

Constants of Dispersion Formula

2.4465754

-1.010704110

1.775913210

8.797025910

-5.701492810

6.092466310

Relative Partial Dispersions  

0.2959

0.2462

0.2372

0.2342

0.5767

0.5110

-0.0004

0.0006

Chemical Properties

Grade  

2

1

2

1

ThermalProperties

573

626

511

551

83

93

 Mechanical Properties

482

0.89

7673

3132

0.255

Stress-Optical 
Coefficient

Coloration Code

38/35

Other Properties

2.60

Internal Transmittance

2400

0.920

0.846

2200

0.935

0.874

2000

0.972

0.944

1800

0.987

0.974

1600

0.996

0.992

1400

0.997

0.995

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

0.997

650

0.997

0.995

600

0.997

0.994

550

0.997

0.994

500

0.994

0.989

480

0.993

0.986

460

0.991

0.983

440

0.990

0.980

420

0.987

0.974

400

0.975

0.950

390

0.954

0.911

380

0.908

0.825

370

0.79

0.63

360

0.51

0.26

350

0.14

0.02

340

330

320

310

300

290

280