Refractive Indices

706.5

1.77122

656.3

1.77597

643.8

1.77733

632.8

1.77861

589.3

1.78446

587.6

1.78472

546.1

1.79191

486.1

1.80648

480.0

1.80837

435.8

1.82527

404.7

1.84225

365.0

Constants of Dispersion Formula

3.0534415

-1.275181010

4.060936910

2.270610910

-7.808660610

1.987402610

Relative Partial Dispersions  

0.2867

0.2380

0.2356

0.2315

0.6157

0.5442

0.0023

0.0138

Chemical Properties

Grade  

1

1

1

1

ThermalProperties

613

646

556

593

94

102

 Mechanical Properties

544

0.43

9196

3675

0.251

Stress-Optical 
Coefficient

Coloration Code

43/37

Other Properties

3.25

Internal Transmittance

2400

0.950

0.902

2200

0.969

0.939

2000

0.985

0.970

1800

0.992

0.985

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

0.996

700

0.996

0.993

650

0.996

0.992

600

0.995

0.991

550

0.994

0.988

500

0.989

0.979

480

0.986

0.973

460

0.982

0.965

440

0.975

0.950

420

0.952

0.907

400

0.89

0.79

390

0.79

0.63

380

0.58

0.34

370

0.24

0.06

360

350

340

330

320

310

300

290

280