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High Temperature Grade: HT40 - 70RP

High temperature silicone rubber applications

These grades of silicone rubber have been specially developed, enabling them to be used at elevated temperatures of up to 300°C. The performance of this grade under high temperatures mean they are suitable for use in a range of applications, including ovens and autoclaves where silicone rubber is commonly used for door seals, lighting,

They work within a large temperature range to provide good resistance and elasticity, and more particularly at very high temperatures.

Characteristics after vulcanisation and postcure (16 h at 250°C Heat Resistance)

Thermal ageing at 200 °C

Thermal ageing at 250 °C

Thermal ageing at 300 °C

Resistance to oil and Boiling Water

 

Characteristics after vulcanisation and postcure (16 h at 250°C)

 

·

Shore A hardness(points) approx.

40

50

60

70

·

Break Strength (kg/cm2) or (Mpa x 10)approx.

60

75

85

80

·

Elongation at break, % approx.

420

400

350

300

·

Tear strength, KN/m, approx.

10

18

20

18

·

Elasticity modulus at 100% elongation, Mpa, approx.

6

11

15

18

·

CS (70 h/150°C/25% (%) approx.

24

27

28

33

·

Resilience (Zwick) % approx.

44

40

36

35

·

Brittle Point, °C approx.

-80

-80

-80

-80

·

Linear Shrinkage (%) approx.

3.3

3.3

3.3

3.3

·

Dielectric strength under 2mm (kV/mm) approx.

16

16

16

16

·

Volume Resistivity (W .cm)

10-16

10-16

10-16

10-16

·

Dielectric Constant at (1 MHz), approx.

2.8

2.8

2.8

2.8

·

Power Factor (1MHz), approx.

2.10-3

2.10-3

2.10-3

2.10-3


Top

 

Thermal ageing at 200 °C


After ageing 500 h

Shore A Hardness (points)

Break strength (kg/cm 2)

Elongation (%)


45

53

315


58

73

305


63

81

285


73

81

235

After ageing 1000 h

Shore A Hardness (points)

Break strength (kg/cm 2)

Elongation (%)


46

40

270


60

59

270


64

67

265


75

70

210

After ageing 2000 h

Shore A Hardness (points)

Break strength (kg/cm 2)

Elongation (%)


47

28

220


62

40

190


67

43

185


78

47

125

After ageing 4000 h

Shore A Hardness (points)

Break strength (kg/cm 2)

Elongation (%)


51

27

190


65

43

170


70

39

125


80

39

75

After ageing 7000 h

Shore A Hardness (points)

Break strength (kg/cm 2)

Elongation (%)


54

25

155


68

36

135


72

38

115


-

-

-

         

 

Top

 

Thermal ageing at 250 °C


Properties

HT40RP

HT50RP

HT60RP

HT70RP

After ageing 16 h

Shore A Hardness (points)

Break strength (kg/cm 2)

Elongation (%)


40

60

420


50

75

400


60

85

350


73

81

300

After ageing 500 h

Shore A Hardness (points)

Break strength (kg/cm 2)

Elongation (%)


47

43

265


63

60

225


70

62

200


80

57

120

After ageing 1000 h

Shore A Hardness (points)

Break strength (kg/cm 2)

Elongation (%)


54

41

230


70

56

190


75

56

160


86

48

75

After ageing 2000 h

Shore A Hardness (points)

Break strength (kg/cm 2)

Elongation (%)


57

42

190


73

50

125


80

42

90


88

45

50

After ageing 3000 h

Shore A Hardness (points)

Break strength (kg/cm 2)

Elongation (%)


57

42

190


73

50

125


80

42

90


88

45

50

After ageing 4000 h

Shore A Hardness (points)

Break strength (kg/cm 2)

Elongation (%)


71

46

145


87

50

70


-

-

-


-

-

-

After ageing 6000 h

Shore A Hardness (points)

Break strength (kg/cm 2)

Elongation (%)


76

51

110


-

-

-


-

-

-


-

-

-

 

Top

 

Thermal ageing at 300 °C


Properties

HT40RP

HT50RP

HT60RP

HT70RP

After ageing 200 h

Shore A Hardness (points)

Break strength (kg/cm 2)

Elongation (%)


50

45

250


65

60

225


80

55

140


85

60

100

After ageing 400 h

Shore A Hardness (points)

Break strength (kg/cm 2)

Elongation (%)


60

45

190


75

55

150


-

-

<100


-

-

<100

After ageing 600 h

Shore A Hardness (points)

Break strength (kg/cm 2)

Elongation (%)


75

45

140


-

-

<100


-

-

-


-

-

-

 

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Resistance to oil and Boiling Water


CHANGE IN PROPERTIES

ASTM Oil n° 1

Boiling Water

Immersion 70h at 150°C

Immersion 70h at 100°C

HT40RP

HT70RP

HT40RP

HT70RP

Shore A Hardness (points), approx.

Swelling (volume)

%, approx.

-6

-8

-8

+4

+2

+1

+1

+1