Y O U R PA R T N E R F O R M E TA L S O L U T I O N S

Without metals in the right spot many things in our

everyday life would not function properly. Whether in

the car, the kitchen or the operating room - wherever

high strength is required, thermal energy is converted

into mechanical motion, electrical currents flow or other

specific properties are desired - metallic materials are

applied.

The highly complex and versatile world of metals

has been the focus of G.RAU since its foundation in

1877 by Gustav Rau. Today the company is a worldwide

leading specialist for innovative solutions in this field.

The high demands on manufacturing and processing

metal products are being met by an experienced staff

of 500. Leading manufacturers in the field of electrical

engineering, electronic, automotive and household

appliances as well as electrical installations have been

relying on our know-how for decades.

For some years now the company has also been a manu-

facturer of products for medical device engineering.

In our two plants in Pforzheim we manufacture a variety

of metallic materials in monolithic form as strip and

sheet, as well as wire and tubes. We also produce

metallic composites like thermostatic bimetals and con-

tact bimetals typically in the shape of strip and sheet.

These materials are processed on state-of-the-art pro-

duction equipment and by advanced methods into stam-

pings, formed parts, deep-drawn or extruded parts. In

addition, electroplated or chemical finishes are

available. Our diverse production capabilities also

enable further processing into assemblies and plastic-

metal-composite applications.

During project development, an intensive dialogue

with our customers and a qualified consultation make

G.RAU a reliable partner. Cooperation with renowned

research institutes and the continuous optimization

of internal production processes are the basis for

innovative and application-oriented solutions.

Thermobimetals are laminated materials consisting of

at least two components with different thermal

expansion coefficients. During heating one of the

components expands more than the others, which

results in a curvature of the thermobimetal. As

greater the variance in thermal expansion between

the components as greater the curvature will be.

During practical application external forces often restrict

a free movement of the thermobimetal. Any partial or

complete restriction results in a corresponding force. This

way a thermobimetal has the capacity of retaining or

releasing energy.

In addition to thermobimetals according to DIN 1715

G.RAU also manufactures a range of other special

thermobimetals.

We supply types with optimum thermal sensitivity

or with a defined electrical resistance. Our delivery

program also includes thermobimetals with a very good

corrosion resistance or with a high thermal expansion.

For improved weldability an electroplating treatment

may be added.

We manufacture strips with a thickness from 0,10 mm

to 2 mm and a width from 1 mm to 150 mm. The tolerances

vary depending on the dimensions, the narrowest

tolerance is +0,1 mm for width and ±0,002 mm for thick-

ness.

Our staff will be pleased to support you in selecting the

most suitable thermobimetal.

T H E R M O B I M E T A L

Description

Cost-efficient thermobimetal (TB) with good thermal sensitivity

Same thermal properties as TB Ge but with a higher limit of bending stress

Standard TB with high thermal sensitivity

TB with good thermal sensitivity and optimum electrical resistance

TB with highest thermal sensitivity

Thermobimetals on the basis of TB Ge with intermediate nickel layers with defined specific electrical resistance for applications with direct electrical heating

Thermobimetals on the basis of TB Ge with intermediate copper layers with defined specific electrical resistance for applications with direct electrical heating

Thermobimetals on the basis of TB M with intermediate layers of copper or nickel with defined specific electrical resistance for applications with direct electrical heating

Standard TB with average thermal sensitivity for applications at higher temperatures

TB with same properties as TB H but better spring capabilities

Like TB H with an intermediate copper layer for faster reaction times and a better temperature distribution

Similar to TB H for applications up to 450° C

TB H 46 with a corrosion protection layer on active components

TB Ge with a corrosion protection layer on both sides

Rust-proof TB with high temperature limit but linear behavior limited to a maximum of 200° C

Rust-proof TB with a high temperature limit and a wide range of linear behavior

TB M with a corrosion protection layer on active component

Hardenable corrosion resistant TB with average thermal sensitivity and a high temperature limit

Material CodeG.RAU

Ge

Ge 15

M

M 80/20

MS

G 25

G 35

G 38

G 45

G 50

G 55

GCuZ 3

GCuZ 6

GCuZ 11

GCuZ 15

GCuZ 17

GCuZ 19

M 5

M 10

M 15

M 20

M 30

M 40

M 60

H

H 15

HCuZ

H 46

RH 46

RGR

R 100 A

RR

RM

RS

T E C H N I C A L S P E C I F I C A T I O N S

CodeDIN 1715

TB 1577 A

TB 1577 B

TB 20110

TB 1425

TB 1435

TB 1555

TB 1511

TB 1170 A

TB 1170 B

TB 1109

TB 0965

Range of linea-rity from -20°C

up to 200 °C

up to 200 °C

up to 200 °C

up to 200 °C

up to 230 °C

up to 200 °C

up to 200 °C

up to 220 °C

up to 200 °C

up to 200 °C

up to 200 °C

up to 200 °C

up to 200 °C

up to 200 °C

up to 200 °C

up to 200 °C

up to 200 °C

up to 200 °C

up to 200 °C

up to 200 °C

up to 200 °C

up to 200 °C

up to 200 °C

up to 200 °C

up to 380 °C

up to 380 °C

up to 380 °C

up to 425 °C

up to 425 °C

up to 225 °C

up to 200 °C

up to 550 °C

up to 200 °C

up to 400 °C

limit of application

450 °C

450 °C

350 °C

350 °C

350 °C

450 °C

450 °C

450 °C

450 °C

450 °C

450 °C

450 °C

400 °C

400 °C

400 °C

400 °C

400 °C

350 °C

350 °C

350 °C

350 °C

350 °C

350 °C

350 °C

450 °C

450 °C

400 °C

450 °C

450 °C

450 °C

550 °C

550 °C

350 °C

650 °C

T H E R M O B I M E T A L

C O N T A C T B I M E T A L

Contact bimetal is a clad material, which combines the

advantageous properties of a relatively inexpensive

carrier material with the special contact properties of a

precious metal coating or a precious metal alloy coating.

For economic reasons the quantity of contact material

is limited to the functionally required minimum. The

relatively expensive precious metal contact material is

only applied to the contact area itself.

G.RAU manufactures contact bimetal strips by means

of pressure welding, brazing, seam welding and electro-

plating. The final selection of the production method

depends on the specified materials, their characteristics

as well as their dimensions.

Contact materials primarily require good switching

characteristics. The carrier material needs to have good

electrical and thermal conductivity. Sufficient strength

and spring-properties as well as good technological

properties like solderability and weldability are

advantageous.

Commonly copper and copper alloys, nickel and

nickel alloys are used while for special applications

thermobimetals are chosen.

We manufacture exclusively according to customer´s

specifications and would be pleased to lend our expertise

to optimizing your choices.

Density

[g/cm3]

19,3

17,8

18,2

15,4

10,5

10,5

10,4

10,3

10,9

10,2

9,7

9,4

10,0

9,8

8,9

8,89

8,9

8,8

8,3

8,8

9,0

9,1

8,73

8,55

8,44

8,8

8,8

8,7

8,9

8,9

8,87

7,86

8,2

8,2

7,9

7,7

MeltingTemperature

[°C]

1063

1058

995-1018

990-1020

961

960,5

900-934

779-875

1150-1220

961

961

961

961

961

1083

1075-1082

1073-1080

1084-1089

870-980

1030-1070

1050-1075

1035-1070

1005-1025

910-965

900-920

910-1040

875-1025

1025-1100

1250-1300

1453

1300-1350

1536

1425

1430

1410

1480

Electricitymodule

[kN/mm2]

78

80

82

114

80

85

85

85

116

84

129

160

-

-

130

124

120

125

130

132

123

122

122

114

110

118

115

127

165

216

180

215

140

145

203

220

Material

Au

AuAg10

AuNi5

AuAg26Ni3

Ag

AgNi0,15

AgCu3

AgCu10

AgPd30

AgNi10

AgNi40FVW

AgNi60FVW

AgSnO28

AgSnO212

Cu

CuAg

CuCrZr

CuFe2

CuBe2

CuCoBe

CuAg2

CuAg3

CuZn15

CuZn28

CuZn37

CuSn6

CuSn8

CuNi18Zn20

CuNi44

Ni

NiCu30Fe

Fe

FeNi36

FeNi42

X5CrNi18 9

X8Cr17

ElectricalConductivity

[m/W mm2]

43

15,9

7,4

9,1

60

56

52

48

6,7

54

37

27

51

42

57

56

26

48*

23

35*

5

10*

12

28*

49

47

21,1

16,5

15,5

9,5

7,5

3,3

2,0

14,6

2,3

10

1,32

1,51

1,37

1,66

Thermalconductivity

[W/mK]

312

147

52

59

419

414

380

335

60

310

210

155

370

300

385

385

109

330

150

260

84

105

160

210

330

315

159

130

121

75

67

33,5

23

92

25,9

75

12,6

15

14,7

25

Temp. coeff.of electricalresistance[K-1 x 10-4 ]

40

12,5

0,71

8,8

41

35

32

28

4,0

35

20

15

15

24

37

39

14

31

-

10

-

30

27,5

16

15

14

7

7

3

0,4

68

11

65,7

12

28

4,6

-

ElectricalResistivity

[µWm]

0,023

0,063

0,136

0,11

0,0167

0,0179

0,0192

0,0208

0,150

0,0180

0,0270

0,0370

0,0196

0,0238

0,0175

0,018

0,0385

0,0208

0,0435

0,0286

0,20

0,10

0,083

0,036

0,02

0,0213

0,047

0,061

0,065

0,1053

0,133

0,303

0,49

0,0685

0,4348

0,10

0,76

0,66

0,7299

0,60

Properties of contact parts on copper

Properties of contact parts on silver

Properties of contact parts on gold

Properties of contact parts on nickel and iron basis

Hardness HV

soft 30% kv

20

40

115

90

30

45

45

65

65

50

75

80

58

72

50

55

50

90

80

100

350

70

200

60

60

60

60

70

100

105

90

105

80

110

100

135

130

180

160

60

85

100

140

70

90

95

120

125

100

120

140

95

100

100

108

90

150

135

2501

400

160

240

130

130

145

150

155

190

210

170

195

180

230

190

200

205

350

260

T E C H N I C A L S P E C I F I C A T I O N S

* Values are valid for age-hardened condition

C O N T A C T B I M E T A L

T U B E S , W I R E S A N D P R O F I L E S

Tubes, wires and profiles made of metallic materials

are used for many applications both in electrical engi-

neering as well as in measurement and control

engineering. If shape, dimensions, tolerances or material

properties do not meet standard requirements we will

manufacture special tubes and profiles according to cus-

tomer´s specification.

G.RAU offers both seamless and welded tubes such as

Bourdon tubes made of tin-bronze, brass, copper-

beryllium or stainless steel with bright metallic outer or

inner surfaces. These stress-relieved tubes are available

in different oval or other special shapes.

Special section tubes made of precious metals and

their alloys, copper and copper alloys, stainless steel

or clad materials in various dimensions of round tubing

with a diameter of up to 30 mm.

Thin walled tubes made of non-ferrous metals and

hardened copper-beryllium alloys.

Capillary tubes made of copper or copper alloys,

stainless steel or special alloys with a choice of either

braiding with copper wire or tin-coated copper wire or a

Polyethylene (PE) coating.

Tubes for glass connections made of iron-nickel alloys

with a defined thermal expansion.

For contact technologies G.RAU manufactures round wires

and profiles made of silver and silver alloys, silver clad

materials or coated wires with a top coating of precious

metal or non-precious metal as well as contact profiles.

Our staff will be pleased to assist you in selecting the

most suitable materials and in optimizing their properties.

M E M O R Y A L L O Y S

.... the leading supplier of semi-finished products made of NITINOL!

NITINOL is much more than just simply a material. Its

shape memory effect and its superelastic behavior enable

remarkable creative solutions. Used primarily in medical

applications our semi-finished NITINOL products are used

for high-grade implants such as stents and a multitude of

flexible medical instruments. The extraordinary capabilities

of NITINOL are also used in automotive and electrical

applications.

Since 1993 EUROFLEX is the leading supplier of high-grade

semi-finished products made of NITINOL for the European

market. EUROFLEX was founded by NDC, Fremont, U.S.A.

and G.RAU, Pforzheim, Germany where the tubes, wires,

strips and components are manufactured.

Our long-standing experience in processing NiTi alloys and

other special materials as well as our knowledge of our

customers’ needs are behind our expanding delivery

program.

We can offer you products made of newly developed

titanium- and cobalt-alloys or magnesium as well as

stainless steel or other special materials.

Please inquire for our latest developments. Our staff will be

pleased to assist you in selecting or optimizing your choice

of materials.

EUROFLEX GmbH

Kaiser-Friedrich-Str. 7

D-75172 Pforzheim

Phone +49(0)7231.208.210

Fax +49(0)7231.208.7599

info@euroflex-gmbh.de

www.euroflex-gmbh.de

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6 A

G. RAU GmbH & Co. KG

Kaiser-Friedrich-Straße 7

D-75172 Pforzheim

Phone: +49(0)72 31/208-0

Fax: +49(0)72 31/208-7599

info@rau-pforzheim.de

www.rau-pforzheim.de