Refractive Indices

706.5

1.69389

656.3

1.69673

643.8

1.69753

632.8

1.69828

589.3

1.70166

587.6

1.70181

546.1

1.70587

486.1

1.71384

480.0

1.71485

435.8

1.72362

404.7

1.73201

365.0

1.74698

Constants of Dispersion Formula

2.8252971

-1.334427310

2.338157510

1.031690810

-5.422772310

5.623430010

Relative Partial Dispersions  

0.2970

0.2472

0.2374

0.2345

0.5714

0.5062

-0.0016

-0.0045

Chemical Properties

Grade  

1

3

1

3

ThermalProperties

580

620

528

563

89

95

 Mechanical  Properties

500

7598

2957

0.284

Stress-Optical 
Coefficient

Coloration Code

40/35

Other Properties

4.28

Internal Transmittance

2400

0.90

0.81

2200

0.948

0.898

2000

0.977

0.955

1800

0.989

0.978

1600

0.997

0.994

1400

0.997

0.995

1200

0.999

0.998

1060

0.999

0.998

1000

0.999

0.998

950

0.999

0.997

900

0.998

0.996

850

0.998

0.995

800

0.996

0.992

700

0.996

0.992

650

0.996

0.992

600

0.996

0.992

550

0.996

0.992

500

0.995

0.989

480

0.994

0.987

460

0.993

0.985

440

0.989

0.978

420

0.981

0.963

400

0.957

0.916

390

0.93

0.86

380

0.88

0.77

370

0.78

0.61

360

0.60

0.36

350

0.29

0.08

340

0.04

330

320

310

300

290

280