2.2.4 Thermal Properties

Thermal

Thermal

Specific

Glass

expansion*

conductivity

heat

Transform.

Softening

type

( 10-6/K)

(W/m K)

( J/g K)

temp. (˚C)

temp. (˚C)

FK 5

9.2

0.925

0.818

464

672

FK 51

16.9

–

–

403

–

PK 2

6.9

1.149

0.80

568

721

PSK 3

7.4

0.990

0.682

602

736

PSK 53

10.7

0.612

0.603

614

–

BK 7

7.1

1.114

0.858

563

766

BaLK N3

9.0

1.029

0.749

562

738

K 5

8.2

0.950

0.783

583

720

UK 50

8.1

0.964

554

735

ZK 1

7.5

0.894

0.77

562

732

ZK N7

5.4

1.042

0.770

528

721

BaK 50

4.6

1.044

0.758

629

820

SK 2

7.0

0.776

0.595

654

823

SK 14

7.0

0.851

0.636

649

773

KF 9

638

1.01

0.75

445

661

BaLF 4

6.4

0.827

0.67

569

731

SSK 4

6.1

0.806

0.57

639

791

SSK N5

7.9

–

0.574

641

751

LaK N7

8.2

–

–

618

716

LaK 10

6.9

–

–

620

703

LLF 6

8.5

–

–

422

627

BaF 4

8.8

0.766

0.557

521

694

BaF N10

7.9

0.798

0.595

630

745

LF 5

9.1

0.866

0.657

419

585

F 2

8.2

0.780

0.557

432

593

BaSF 2

9.3

–

–

493

640

BaSF 51

6.4

0.722

0.536

522

630

LaF N3

9.1

0.670

0.481

616

736

LaF N21

6.9

–

–

667

–

LaSF 30

7.1

–

–

684

–

LaSF 31

7.9

–

–

753

–

SF 2

9.2

0.735

0.498

441

600

SF 59

10.3

0.506

0.306

362

–

SF N64

9.7

578

666

TiK 1

10.3

0.773

0.842

340

–

TiF 1

9.1

0.953

0.81

443

–

TiF 6

16.7

–

–

410

494

KzF N1

7.5

–

–

470

675

KzFS N4

5.5

0.769

0.64

492

594

LgSK 2

12.1

0.866

0.51

515

–

NbF 1

5.3

0.845

0.48

590

625

* 20/300˚C