Refractive Indices

706.5

1.79590

656.3

1.79882

643.8

1.79964

632.8

1.80041

589.3

1.80385

587.6

1.80400

546.1

1.80811

486.1

1.81608

480.0

1.81708

435.8

1.82569

404.7

1.83379

365.0

1.84784

Constants of Dispersion Formula

3.1767027

-1.535003210

2.669066610

7.078408910

-1.548509310

1.953066610

Relative Partial Dispersions  

0.3003

0.2501

0.2380

0.2356

0.5571

0.4939

-0.0025

-0.0093

Chemical Properties

Grade

1

3

1

2

ThermalProperties

668

707

625

658

63

72

 Mechanical Properties

820

1.75

12586

4870

0.292

Stress-Optical 
Coefficient

Coloration Code

40/32

Other Properties

4.72

Internal Transmittance

2400

0.84

0.70

2200

0.962

0.926

2000

0.987

0.974

1800

0.998

0.997

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

0.998

0.997

800

0.997

0.995

700

0.997

0.994

650

0.996

0.992

600

0.996

0.992

550

0.995

0.990

500

0.993

0.986

480

0.991

0.982

460

0.988

0.976

440

0.984

0.969

420

0.978

0.956

400

0.961

0.923

390

0.942

0.888

380

0.912

0.831

370

0.86

0.74

360

0.78

0.61

350

0.68

0.46

340

0.54

0.29

330

0.37

0.14

320

0.20

0.04

310

300

290

280