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

–

–

–

–

–

–

 

Top

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