The Mould Design Guide

Chapter 25: Mathematical and Reference Tables

25.1 Logarithms

25.2 Anti-logarithms

25.3 Natural Sines

25.4 Natural Cosines

25.5 Natural Tangents

25.6 Square Roots

25.7 Reciprocals

25.8 Powers, Roots and Reciprocals

25.9 Thermal Properties of Some Common Mould-making Materials

25.10 Typical Thermal and Mechanical Properties of Steels for Injection Moulds

AISI No.

Density(kg/m 3)

Thermal conductivity(W/(m-K))

Thermal expansion(10 -6K -1)

Spec. Heat capacity (J/(Kg.k))

Tensile strength(MPa)

Yield strength(MPa)

Elongation(%)

1020

7850

46.7

11-15

460

520

440

20

1030

7833

46.7

14.9

600

51O

17.5

1040

7833

46.7

680

450

16

1095

7800

43.3

11-14

470

1380

960

10-15

4130

7833

46.7

560

360

28

6150

7860

60.6

10-12

460

665

410

23

8620

7833

-

535

385

31

S1

7960

62.3

11-13

440

2070

1900

4

S7

14.9

2170

1450

7

H13

7800

24.6

12-13

460

950

750

20

P20

7800

29.0

12.7

460

950

750

20

420

7800

23.0

11-12

460

2050

1600

8

25.11 Thermal Properties of Plastics Materials

Polymer operal.

Specific gravity

Specific heat (KJ/kg C)

Thermal conductivity (W/m/K)

Coeff. of therm, exp.( ?m/m/k)

Thermal diffusivity(m 2/s)x10 -7

Max. temperature( C)

ABS

1.04

1.47

0.3

90

1.7

70

Aoctal

1.42

1.47

0.2

80

0.7

85

(Homo-pol.)

Acetal

1.41

1.47

0.2

95

0.72

90

(Co-pol.)

Acrylic

1.18

1.47

0.2

70

1.09

50

Cellulose

1.28

1.50

0.15

100

1.04

60

Acetate

Epony

1.90

-

0.23

70

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